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Biology M.C.Q (1 Marks)

Plant Growth and Development · Uttarakhand Board (UBSE) STD 11 Science (Uttarakhand - English Medium). 155 questions.

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M.C.Q (1 Marks)

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155 questions · auto-graded multiple-choice test.

MCQ 11 Mark
Which of the following is also called a growth hormone?
  • A
    Gibberellins.
  • ✓
    Auxins.
  • C
    Cytokinins.
  • D
    Abscisic Acid.
Answer
Correct option: B.
Auxins.
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MCQ 21 Mark
Plants showing vernalism usually flower during which season?
  • A
    Autumn.
  • B
    Summer.
  • C
    Winter.
  • ✓
    Spring.
Answer
Correct option: D.
Spring.
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MCQ 31 Mark
Apical dominance in plants is caused by.
  • ✓
    High concentration of auxins in the terminal bud.
  • B
    High concentration of gibberellins in the apical bud.
  • C
    High concentration of auxins in the lateral bud.
  • D
    Absence of auxins and gibberellins in apical bud.
Answer
Correct option: A.
High concentration of auxins in the terminal bud.
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MCQ 41 Mark
In short$-$day plants, flowering is induced by.
  • A
    Photoperiod less than $12\ \text{hr}.$
  • ✓
    Photoperiod below a critical length and uninterrupted long night.
  • C
    Long night.
  • D
    Short photoperiod and interrupted long night.
Answer
Correct option: B.
Photoperiod below a critical length and uninterrupted long night.
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MCQ 51 Mark
Which one of the followings is a gaseous plant hormone?
  • ✓
    Ethylene.
  • B
    Gibberellin.
  • C
    $\text{IAA}.$
  • D
    Abscisic acid.
Answer
Correct option: A.
Ethylene.
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MCQ 61 Mark
Apples are generally wrapped in waxed paper to:
  • A
    Prevent sunlight for changing its colour.
  • ✓
    Prevent aerobic respiration by checking the entry of $0_2$.
  • C
    Prevent ethylene formation due to injury.
  • D
    Make the apples look attractive.
Answer
Correct option: B.
Prevent aerobic respiration by checking the entry of $0_2$.
Aerobic respiration will hasten rotting of apple.
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MCQ 71 Mark
What will be the effect on phytochrome in a plant subjected to continuous red light?
  • A
    Level of phytochrome decreases.
  • ✓
    Phytochrome is destroyed.
  • C
    Phytochrome synthesis increases.
  • D
    Destruction and synthesis of phytochrome remain in equilibrium.
Answer
Correct option: B.
Phytochrome is destroyed.
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MCQ 81 Mark
Ethylene is used for:
  • A
    Retarding ripening of tomatoes.
  • ✓
    Hastening of ripening of fruits.
  • C
    Slowing down ripening of apples.
  • D
    Both $b$ and $c.$
Answer
Correct option: B.
Hastening of ripening of fruits.
Ethylene is a fruit ripening hormone. It stimulates all the biochemical changes which take place upon fruit ripening.
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MCQ 91 Mark
Which combination of gases is suitable for fruit ripening?
  • A
    $80\%\  \ce{CO_2}$ and $20\%\ \ce{CH_2}$
  • B
    $80\%\  \ce{CH_4}$ and $20\%\  \ce{CO_2}$
  • C
    $80\%\  \ce{CO_2}$ and $20\%\  O_2$
  • ✓
    $80\%\  C_2H_4$ and $20\%\  \ce{CO_2}$
Answer
Correct option: D.
$80\%\  C_2H_4$ and $20\%\  \ce{CO_2}$
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MCQ 101 Mark
To avoid excessive water loss during severe drought stress,the closure of stomata is signalled by the production of:
  • ✓
    $\text{ABA}$
  • B
    $\text{IAA}$
  • C
    $\text{NAA}$
  • D
    $\text{IBA}$
Answer
Correct option: A.
$\text{ABA}$
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MCQ 111 Mark
Phototropic movements in plants are due to?
  • ✓
    Auxin
  • B
    Gibberellins
  • C
    Cytokinin
  • D
    Abscisic acid
Answer
Correct option: A.
Auxin
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MCQ 121 Mark
Plants grow throughout their life due to.
  • ✓
    Presence of meristems.
  • B
    Presence of vascular cambium.
  • C
    Presence of xylem and phloem.
  • D
    Presence of tracheids.
Answer
Correct option: A.
Presence of meristems.
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MCQ 131 Mark
High concentration of auxin is present in:
  • A
    Root apex
  • ✓
    Shoot apex
  • C
    Petiole
  • D
    Node
Answer
Correct option: B.
Shoot apex
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MCQ 141 Mark
The ability to regain or recover the lost or injured part of body is:
  • A
    Aging.
  • ✓
    Regeneration.
  • C
    Abnormal development.
  • D
    Primary inductio.
Answer
Correct option: B.
Regeneration.
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MCQ 151 Mark
Choose the correct answer from the alternatives given. During germination of certain seeds, gibberellic acid activates the synthesis of:
  • A
    Starch
  • ✓
    Amylase
  • C
    Amylopectin
  • D
    Glycogen
Answer
Correct option: B.
Amylase
Gibberellic acid enhances the synthesis of $\alpha -$amylase in isolated aleurone layers of seeds.
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MCQ 161 Mark
Leaf fall can be prevented with the help of:
  • A
    Abscisic acid.
  • B
    Auxins.
  • C
    Florigen.
  • ✓
    Cytokinins.
Answer
Correct option: D.
Cytokinins.
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MCQ 171 Mark
Growth is maximum in the zone of:
  • A
    Cell division
  • ✓
    Cell elongation
  • C
    Cell maturation
  • D
    All of the above
Answer
Correct option: B.
Cell elongation
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MCQ 181 Mark
Match the following:
$A.$ $\text{IAA}$ $i.$ Herring sperm $\text{DNA}$
$B.$ $\text{ABA}$ $ii.$ Bolting
$C.$ Ethylene $iii.$ Stomatal closure
$D.$ $GA$ $iv.$ Weed$-$free lawns
$E.$ Cytokinins $v.$ Ripening of fruits
  • ✓
    $\text{A – iv, B – iii, C – v, D – ii, E – i.}$
  • B
    $\text{A – v, B – iii, C – iv, D – ii, E – i.}$
  • C
    $\text{A – iv, B – i, C – iv, D – iii, E – ii.}$
  • D
    $\text{A – v, B – iii, C – ii, D – i, E - iv.}$
Answer
Correct option: A.
$\text{A – iv, B – iii, C – v, D – ii, E – i.}$
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MCQ 191 Mark
Opening of floral buds into flowers, is a type of:
  • A
    Autonomic movement of variation.
  • B
    Autonomic movement of locomotion.
  • ✓
    Autonomic movement of growth.
  • D
    Paratonic movement of growth.
Answer
Correct option: C.
Autonomic movement of growth.
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MCQ 201 Mark
The pigment, that absorbs red and far$-$red light in plants, is:
  • A
    Xanthophyll.
  • B
    Cytochrome.
  • ✓
    Phytochrome.
  • D
    Carotene.
Answer
Correct option: C.
Phytochrome.
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MCQ 211 Mark
Vernalisation is carried out at:
  • A
    Low light intensity.
  • B
    High temperature.
  • C
    High light intensity.
  • ✓
    Low temperature.
Answer
Correct option: D.
Low temperature.
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MCQ 221 Mark
Growth can be measured in various ways. Which of these can be used as parameters to measure growth:
  • A
    Increase in cell number.
  • B
    Increase in cell size.
  • C
    Increase in length and weight.
  • ✓
    All the above.
Answer
Correct option: D.
All the above.
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MCQ 231 Mark
Which hormone is produced in most plant cells as product of metabolism?
  • ✓
    Gibberellin
  • B
    Cytokinin
  • C
    Auxin
  • D
    Ethylene
Answer
Correct option: A.
Gibberellin
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MCQ 241 Mark
Opening of floral buds into flowers, is a type of:
  • A
    Autonomic movement of locomotion.
  • B
    Autonomic movement of variation.
  • C
    Paratonic movement of growth.
  • ✓
    Autonomic movement of growth.
Answer
Correct option: D.
Autonomic movement of growth.
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MCQ 251 Mark
Which of the following hormones acts as growth inhibitor?
  • A
    Gibberellins.
  • B
    Auxins.
  • C
    Cytokinins.
  • ✓
    Abscisic Acid.
Answer
Correct option: D.
Abscisic Acid.
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MCQ 261 Mark
Which of the following plants show good example of photoperiodism?
  • A
    Tomato.
  • B
    Cucumber.
  • ✓
    Lotus.
  • D
    Sunflower.
Answer
Correct option: C.
Lotus.
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MCQ 271 Mark
What will happen if terminal buds are removed from a plant?
  • A
    The whole plant will die.
  • ✓
    The lateral buds will grow into branches.
  • C
    The roots will die.
  • D
    The shoot will die.
Answer
Correct option: B.
The lateral buds will grow into branches.
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MCQ 281 Mark
To increase sugar production in sugarcanes, they are sprayed with:
  • A
    $\text{IAA}.$
  • B
    Cytokinin.
  • ✓
    Gibberellin.
  • D
    Ethylene.
Answer
Correct option: C.
Gibberellin.
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MCQ 291 Mark
Rhizocaline is an additional hormonal substance which is secreted by:
  • A
    Cotyledons
  • B
    Roots
  • ✓
    Leaves
  • D
    Stem
Answer
Correct option: C.
Leaves
Rhizocaline is a hormone or hormone$-$like factor distinct from auxin that is held to play a role in the formation of plant roots.
It is also called as root forming hormone and it is produced by the leaves.
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MCQ 301 Mark
To prevent over$-$ripening, bananas should be.
  • A
    Given a dip in ascorbic acid.
  • B
    Maintained at room temperature.
  • ✓
    Refrigerated.
  • D
    Stored at the top of refrigerator.
Answer
Correct option: C.
Refrigerated.
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MCQ 311 Mark
Cavity formed between somatic and splanchnic mesoderm is called:
  • A
    Gastrocoele.
  • B
    Blastocoele.
  • ✓
    Coelom.
  • D
    Neurocoele.
Answer
Correct option: C.
Coelom.
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MCQ 321 Mark
Highest auxin concentration occurs.
  • ✓
    In growing tips.
  • B
    In leaves.
  • C
    At base of plant organs.
  • D
    In xylem and phloem.
Answer
Correct option: A.
In growing tips.
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MCQ 331 Mark
The term synergistic action of hormones refers to:
  • A
    When two hormones act together but bring about opposite effects.
  • B
    When two hormones act together and contribute to the same function.
  • C
    When one hormone affects more than one function.
  • ✓
    When many hormones bring about any one function.
Answer
Correct option: D.
When many hormones bring about any one function.
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MCQ 341 Mark
The affect of apical dominance can be overcome by which of the following hormone:
  • A
    $\text{IAA}.$
  • B
    Ethylene.
  • C
    Gibberellin.
  • ✓
    Cytokinin.
Answer
Correct option: D.
Cytokinin.
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MCQ 351 Mark
Evergreen trees remain green throughout the year on account of $..........?$
  • A
    Absence of leaf fall
  • ✓
    Leaves falling in small numbers at intervals
  • C
    Supply of the moisture throughout the year
  • D
    Cold climate
Answer
Correct option: B.
Leaves falling in small numbers at intervals
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MCQ 361 Mark
Fruit ripening is accelerated by:
  • A
    Warm surroundings
  • B
    Increased nitrogen supply
  • C
    Reduced water supply
  • ✓
    Ethylene rich atmosphere
Answer
Correct option: D.
Ethylene rich atmosphere
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MCQ 371 Mark
The plant material which is widely used in the preparation of culture medium is:
  • A
    Cycas revoluta
  • ✓
    Cocos nucifera
  • C
    Pinus longifolia
  • D
    Borassus flabellifer
Answer
Correct option: B.
Cocos nucifera
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MCQ 381 Mark
Which one of the following triggers the ripening of fruits?
  • ✓
    Ethylene
  • B
    Indoleacetic acid
  • C
    Gibberellic acid
  • D
    Kinetin
Answer
Correct option: A.
Ethylene
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MCQ 391 Mark
Parthenocarpic fruit can be produced by the application of which of the following auxin?
  • A
    $2, 4-D (2-4$ dichlorophenoxy acetic acid$)$.
  • B
    $\text{IAA (}$Indole acetic acid$)$.
  • C
    $\text{IBA (}$Indole butyric acid$)$.
  • ✓
    All of the above.
Answer
Correct option: D.
All of the above.
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MCQ 401 Mark
If a tree, flowers thrice in a year $($Oct., Jan. and July$)$ in Northern India, it is said to be.
  • A
    Photosensitive but thermoinsensitive.
  • B
    Thermosensitive but photoinsensitive.
  • C
    Photo and thermosensitive.
  • ✓
    Photo and thermoinsensitive.
Answer
Correct option: D.
Photo and thermoinsensitive.
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MCQ 411 Mark
What is agent orange?
  • A
    A biodegradable insecticide.
  • ✓
    A weedicide containing dioxin.
  • C
    Colour used in fluorescent lamp.
  • D
    A hazardous chemical used in luminous paints.
Answer
Correct option: B.
A weedicide containing dioxin.
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MCQ 421 Mark
The closing and opening of the leaves of Mimosa pudica is due to:
  • A
    Thermonastic movement.
  • ✓
    Hydrotropic movement.
  • C
    Seismonastic movement.
  • D
    Chemonastic movement.
Answer
Correct option: B.
Hydrotropic movement.
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MCQ 431 Mark
Which of the following hormones does not naturally occur in plants?
  • A
    $\text{IAA}$
  • ✓
    $2, 4-D(2, 4-$dichloropheoxy acetic acid$)$.
  • C
    $\text{ABA}$
  • D
    $GA$
Answer
Correct option: B.
$2, 4-D(2, 4-$dichloropheoxy acetic acid$)$.
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MCQ 441 Mark
Foolish seedling disease is associated with:
  • ✓
    Gibberellins.
  • B
    Auxin.
  • C
    Cytokinins.
  • D
    $\text{ABA}.$
Answer
Correct option: A.
Gibberellins.
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MCQ 451 Mark
The plant hormone which is essential for cell division is:
  • A
    Auxin
  • ✓
    Cytokinin
  • C
    Ethylene
  • D
    Gibberellin
Answer
Correct option: B.
Cytokinin
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MCQ 461 Mark
Flowering dependent on cold treatment is:
  • A
    Cryotherapy.
  • B
    Cryogenics.
  • C
    Cryoscopy.
  • ✓
    Vernalization.
Answer
Correct option: D.
Vernalization.
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MCQ 471 Mark
Phytohormones are:
  • ✓
    Regulators synthesized by plants and influencing physiological processes.
  • B
    Hormones regulating growth from seed to adulthood.
  • C
    Chemicals regulating secondary growth.
  • D
    Chemicals regulating flowering.
Answer
Correct option: A.
Regulators synthesized by plants and influencing physiological processes.
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MCQ 481 Mark
Coiling of garden pea tendrils around any support is an example of:
  • A
    Thigmotaxis.
  • B
    Thigmonasty.
  • ✓
    Thigmotropism.
  • D
    Thermotaxis.
Answer
Correct option: C.
Thigmotropism.
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MCQ 491 Mark
Which of the following types of phytohormones resemble the nucleic acids in some structural aspects?
  • ✓
    Cytokinin.
  • B
    $\text{ABA}.$
  • C
    Auxin.
  • D
    Gibberellin.
Answer
Correct option: A.
Cytokinin.
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MCQ 501 Mark
Which of the following hormones promotes flowering in long day plants also controls sex expression?
  • A
    $\text{IAA}$
  • B
    $\text{ABA}$
  • ✓
    $\ce{GA_3}$
  • D
    $2, 4-D$
Answer
Correct option: C.
$\ce{GA_3}$
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MCQ 511 Mark
When light falls on a part of the plant, a hormone called $..........$ which is synthesized at the tip of the shoot helps the cells to grow longer?
  • A
    Gibberellins
  • B
    Cytokinins
  • C
    Ethylene
  • ✓
    Auxin
Answer
Correct option: D.
Auxin
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MCQ 521 Mark
Cytokinins are chemically:
  • A
    Terpenes.
  • ✓
    Adenine$-$derivative.
  • C
    Indole compounds.
  • D
    Carotenoid derivative.
Answer
Correct option: B.
Adenine$-$derivative.
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MCQ 531 Mark
Which of the following is a growth promoter hormone?
  • ✓
    Auxin
  • B
    Abscisic acid
  • C
    Ethylene
  • D
    Both $B$ and $C$
Answer
Correct option: A.
Auxin
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MCQ 541 Mark
Plants deficient in zinc, show reduced biosynthesis of growth hormone:
  • A
    Cytokinin
  • ✓
    Auxin
  • C
    Ethylene
  • D
    Abscisic acid
Answer
Correct option: B.
Auxin
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MCQ 551 Mark
Which one of the following generally acts as an antagonist to gibberellins?
  • ✓
    $\text{ABA}$
  • B
    Zeatin
  • C
    Ethylene
  • D
    $\text{IAA}$
Answer
Correct option: A.
$\text{ABA}$
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MCQ 561 Mark
Ethylene gas is used for.
  • A
    Growth of plants.
  • B
    Delaying fruit’s abscission.
  • ✓
    Ripening of fruits.
  • D
    Stopping the leaf abscission.
Answer
Correct option: C.
Ripening of fruits.
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MCQ 571 Mark
Hormone primarily connected with cell division is:
  • A
    $\text{IAA}.$
  • B
    $\text{NAA}.$
  • ✓
    Cytokinin$/$zeatin.
  • D
    Gibberellic acid.
Answer
Correct option: C.
Cytokinin$/$zeatin.
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MCQ 581 Mark
Growth in dorsiventral leaf is measured in terms of:
  • A
    Length of leaf.
  • B
    Increase in cell number.
  • ✓
    Surface area increase.
  • D
    None of these.
Answer
Correct option: C.
Surface area increase.
Increase in surface area denotes the growth in a dorsiventral leaf.
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MCQ 591 Mark
Seed dormancy is due to:
  • ✓
    Abscisic acid.
  • B
    Gibberellin.
  • C
    Indole acetic acid.
  • D
    Ethylene.
Answer
Correct option: A.
Abscisic acid.
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MCQ 601 Mark
Which is employed for artificial ripening of banana fruits?
  • A
    Auxin.
  • B
    Cumarin.
  • ✓
    Ethylene.
  • D
    Cytokinin.
Answer
Correct option: C.
Ethylene.
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MCQ 611 Mark
Plasticity in plant growth means that:
  • A
    Plant roots are extensible.
  • B
    Plant development is dependent on the environment.
  • C
    Stems can extend.
  • ✓
    None of the above.
Answer
Correct option: D.
None of the above.
Plasticity in plant growth means that plant development is dependent on the environment.
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MCQ 621 Mark
Cells of fibers and tracheids elongate during.
  • ✓
    Phase of cell division.
  • B
    Phase of cell elongation.
  • C
    Phase of cell maturation.
  • D
    Phase of cell differentiation.
Answer
Correct option: A.
Phase of cell division.
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MCQ 631 Mark
Monocarpic plants are those which:
  • A
    Bear flowers with one ovary.
  • B
    Flower once and die.
  • ✓
    Bear only one flower.
  • D
    All of the above.
Answer
Correct option: C.
Bear only one flower.
Monocarpic plants are those plants that flower once during their life time, set seeds and then die$, e.g.,$ bamboos.
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MCQ 651 Mark
Phototropic curvature is the result of uneven distribution of:
  • A
    Gibberellin.
  • B
    Phytochrome.
  • C
    Cytokinins.
  • ✓
    Auxin.
Answer
Correct option: D.
Auxin.
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MCQ 661 Mark
Mechanism of development was explained by.
  • A
    Hans Dietrisch.
  • B
    Spemann.
  • ✓
    Both $a$ and $b.$
  • D
    Haemmerling.
Answer
Correct option: C.
Both $a$ and $b.$
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MCQ 671 Mark
Which one of the following statement regarding auxin is$/$ are correct?
  • A
    $\text{IAA}$ and $\text{NAA}$ are natural but $\text{IBA, 2, 4, 5-T}$ and $\text{2, 4-D}$ are synthetic auxins.
  • B
    $\text{NAA}$ and $\text{2, 4, 5-T}$ are natural but $\text{IAA, IBA}$ and $\text{2, 4-D}$ are synthetic auxins.
  • C
    $\text{IAA, NAA, IBA, 2, 4-D}$ and $\text{2, 4, 5-T}$ are synthetic auxins.
  • ✓
    $\text{IAA}$ and $\text{IBA}$ are natural but $\text{NAA, 2, 4-D}$ and $\text{2, 4, 5-T}$ are synthetic auxins.
Answer
Correct option: D.
$\text{IAA}$ and $\text{IBA}$ are natural but $\text{NAA, 2, 4-D}$ and $\text{2, 4, 5-T}$ are synthetic auxins.
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MCQ 681 Mark
Indole acetic acid is a:
  • A
    Chemical found in the retina of nocturnal animals
  • B
    Pesticide
  • C
    Good fertilizer
  • ✓
    Naturally occurring auxin
Answer
Correct option: D.
Naturally occurring auxin
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MCQ 691 Mark
Which one increases in the absence of light?
  • A
    Uptake of minerals.
  • B
    Uptake of water.
  • ✓
    Elongation of internodes.
  • D
    Ascent of sap.
Answer
Correct option: C.
Elongation of internodes.
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MCQ 701 Mark
Auxins are mostly produced in:
  • A
    Shoot
  • ✓
    Meristematic region of stem
  • C
    Root
  • D
    Leaf buds
Answer
Correct option: B.
Meristematic region of stem
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MCQ 711 Mark
Cytokinins are byproducts of:
  • A
    Fat metabolism
  • B
    Protein metabolism
  • C
    Carbohydrate metabolism
  • ✓
    Nucleic acid metabolism
Answer
Correct option: D.
Nucleic acid metabolism
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MCQ 721 Mark
In short day plants, flowering is induced by.
  • A
    Long night.
  • B
    Short photoperiod and interrupted long night.
  • C
    Photoperiod less than $12$ hours.
  • ✓
    Photoperiod below a critical length and uninterrupted long night.
Answer
Correct option: D.
Photoperiod below a critical length and uninterrupted long night.
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MCQ 731 Mark
Bananas can be prevented from over$-$ripening by:
  • A
    Maintaining them at room temperature.
  • B
    Refrigeration.
  • ✓
    Dipping in ascorbic acid solution.
  • D
    Storing in a freezer.
Answer
Correct option: C.
Dipping in ascorbic acid solution.
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MCQ 741 Mark
Phytocytomine is a:
  • ✓
    Kinetin
  • B
    Giberellin
  • C
    Auxin
  • D
    None of the above
Answer
Correct option: A.
Kinetin
Phytocytomine is a plant growth regulator. It is a kind of kinetin.It is synthesized from Licheniformis bacillus.
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MCQ 751 Mark
Senescence in plants is delayed by:
  • A
    Ethylene.
  • B
    Abscisic acid.
  • C
    Gibberellins.
  • ✓
    Cytokinin.
Answer
Correct option: D.
Cytokinin.
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MCQ 761 Mark
Abscisic acid causes.
  • ✓
    Stomatal closure.
  • B
    Stem elongation.
  • C
    Leaf expansion.
  • D
    Root elongation.
Answer
Correct option: A.
Stomatal closure.
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MCQ 771 Mark
Cytokinins.
  • A
    Promote abscission.
  • B
    Influence water movement.
  • ✓
    Help retain chlorophyll.
  • D
    Inhibit protoplasmic streaming.
Answer
Correct option: C.
Help retain chlorophyll.
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MCQ 781 Mark
Which is a stress hormone? or the hormone produced during adverse environmental conditions is:
  • A
    Benzyl aminopurine.
  • B
    Dichlorophenoxy acetic acid.
  • C
    Ethylene.
  • ✓
    Abscisic acid.
Answer
Correct option: D.
Abscisic acid.
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MCQ 791 Mark
The hormone which controls cell division and cell differentiation is:
  • A
    Auxin.
  • ✓
    Cytokinin.
  • C
    $\text{ABA}.$
  • D
    Gibberellin.
Answer
Correct option: B.
Cytokinin.
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MCQ 801 Mark
In a plant growing under dark condition, the leaves turn light coloured, internodes become much elongated and it is termed as:
  • A
    Etiolation.
  • B
    Chlorosis.
  • ✓
    Vernalization.
  • D
    Phyllotaxy.
Answer
Correct option: C.
Vernalization.
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MCQ 811 Mark
Phytohormones are.
  • A
    Chemicals regulating flowering.
  • B
    Chemicals regulating secondary growth.
  • C
    Hormones regulating growth from seed to adulthood.
  • ✓
    Regulators synthesized by plants and influencing physiological processes.
Answer
Correct option: D.
Regulators synthesized by plants and influencing physiological processes.
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MCQ 821 Mark
Cytokinins
  • A
    Promotes abscission
  • B
    Influence water movement
  • ✓
    Help retain chlorophyll
  • D
    Inhibit protoplasmic streaming
Answer
Correct option: C.
Help retain chlorophyll
Cytokinins induce the formation of new leaves and chloroplast in leaves.
Ethylene promotes abscission in plants. Auxins help in water movement and promote protoplasmic streaming in plants.
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MCQ 831 Mark
What is the direction of growth in vascular bundles?
  • A
    Parallel to the length of stem.
  • B
    Parallel to the length of stem and towards the apex of stem.
  • ✓
    Perpendicular to the length of stem.
  • D
    It can be in all directions.
Answer
Correct option: C.
Perpendicular to the length of stem.
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MCQ 841 Mark
A plant hormone used for inducing morphogenesis in plant tissue culture is:
  • A
    Gibberellins.
  • ✓
    Cytokinins.
  • C
    Ethylene.
  • D
    Abscisic acid.
Answer
Correct option: B.
Cytokinins.
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MCQ 851 Mark
Geocarpic fruits are produced by.
  • A
    Onion.
  • B
    Watermelon.
  • ✓
    Ground nut.
  • D
    Carrot.
Answer
Correct option: C.
Ground nut.
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MCQ 861 Mark
Intercalary meristems are of:
  • A
    Permanent nature.
  • ✓
    Temporary nature.
  • C
    Some are permanent some temporary.
  • D
    None of these.
Answer
Correct option: B.
Temporary nature.
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MCQ 871 Mark
Gibberellins induce.
  • A
    Flowering.
  • ✓
    Production of hydrolyzing enzymes in germinating seeds.
  • C
    Cell division.
  • D
    Hasten leaf senescence.
Answer
Correct option: B.
Production of hydrolyzing enzymes in germinating seeds.
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MCQ 891 Mark
Which one is a long day plant?
  • ✓
    Spinach.
  • B
    Mirabilis jalapa.
  • C
    Tobacco.
  • D
    Glycine max.
Answer
Correct option: A.
Spinach.
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MCQ 901 Mark
How many daughter cells are formed after mitotic division in case of arithmetic growth?
  • A
    $1$
  • ✓
    $2$
  • C
    $3$
  • D
    $4$
Answer
Correct option: B.
$2$
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MCQ 911 Mark
The hormones which are found to be more effective in inducing parthenocarpy are:
  • ✓
    Cytokinins
  • B
    Ethylene
  • C
    Auxins
  • D
    Ethephon
Answer
Correct option: A.
Cytokinins
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MCQ 921 Mark
The ability of the callus cells to differentiate into a plant organ is:
  • A
    Differentiation
  • B
    Dedifferentiation
  • ✓
    Redifferentiation
  • D
    None of the above
Answer
Correct option: C.
Redifferentiation
The phenomenon of generation of whole plant by single cell is totipotency. This is the characteristic of plants mostly. When a plant of differentiated tissue is cultured in a nutrient medium it gain the property of division get specialized and form and organ.
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MCQ 931 Mark
The substance that accelerates the elongation in the stem is:
  • ✓
    Auxin
  • B
    Cytokinin
  • C
    Enzyme
  • D
    Vitamin
Answer
Correct option: A.
Auxin
Auxins promote stem elongation.
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MCQ 941 Mark
In vascular plants, light promotes:
  • A
    Growth
  • B
    Development
  • C
    Differentiation
  • ✓
    All of the above
Answer
Correct option: D.
All of the above
Vascular plants are the plants which have fully developed vascular tissues which help in the conduction of water, minerals and food throughout the plant.Light increases the metabolic functions of plant$-$like photosynthesis, seed germination, transportation, transpiration etc. which further promotes the process like growth, development and differentiation.
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MCQ 951 Mark
Abscisic acid controls.
  • A
    Cell division.
  • ✓
    Leaf fall and dormancy.
  • C
    Shoot elongation.
  • D
    Cell elongation and wall formation.
Answer
Correct option: B.
Leaf fall and dormancy.
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MCQ 961 Mark
A farmer wants to get higher yield of grapes. Which $\text{PGR}$ should he use on grape plants?
  • ✓
    Gibberellins.
  • B
    Cytokinins.
  • C
    Ethylene.
  • D
    Abscisic Acid.
Answer
Correct option: A.
Gibberellins.
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MCQ 971 Mark
A plant completing its life cycle before the onset of dry condition is said to be.
  • ✓
    Drought escaping.
  • B
    Short day plant.
  • C
    Long day plant.
  • D
    All of these.
Answer
Correct option: A.
Drought escaping.
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MCQ 981 Mark
Removal of apical bud results in.
  • A
    Formation of new apical bud.
  • B
    Elongation of main stem.
  • C
    Death of plant.
  • ✓
    Formation of lateral branching.
Answer
Correct option: D.
Formation of lateral branching.
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MCQ 991 Mark
Movement of auxin is:
  • A
    Centripetal.
  • B
    Basipetal.
  • C
    Acropetal.
  • ✓
    Both $(b)$ and $(c).$
Answer
Correct option: D.
Both $(b)$ and $(c).$
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MCQ 1001 Mark
Which one of the following is a natural growth inhibitor?
  • A
    $\text{GA}$
  • B
    $\text{NAA}$
  • ✓
    $\text{ABA}$
  • D
    $\text{IAA}$
Answer
Correct option: C.
$\text{ABA}$
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MCQ 1011 Mark
Differentiation of shoot is controlled by:
  • A
    high gibberellin: ethylene ratio.
  • B
    high auxin: gibberellin ratio.
  • ✓
    high cytokinin: auxin ratio.
  • D
    high gibberellin: auxin ratio.
Answer
Correct option: C.
high cytokinin: auxin ratio.
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MCQ 1021 Mark
Growth of a shoot or a root involves:
  • A
    Cell enlargement
  • B
    Cell division
  • C
    Cell differentiation
  • ✓
    All the above
Answer
Correct option: D.
All the above
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MCQ 1031 Mark
The conditions necessary for vernalization are.
  • ✓
    Water and carbon dioxide.
  • B
    Oxygen and water.
  • C
    Low temperature and oxygen.
  • D
    High temperature and water.
Answer
Correct option: A.
Water and carbon dioxide.
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MCQ 1041 Mark
Mobilisation of stored food in germinating seeds is triggered by:
  • A
    Auxins.
  • B
    Cytokinins.
  • ✓
    Gibberellins.
  • D
    Ethylene.
Answer
Correct option: C.
Gibberellins.
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MCQ 1051 Mark
Leaves of many grasses are capable of folding and unfolding because they.
  • A
    Are very thin.
  • B
    Are isobilateral.
  • ✓
    Have specialized bulliform cells.
  • D
    Have parallel vascular bundles.
Answer
Correct option: C.
Have specialized bulliform cells.
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MCQ 1061 Mark
Genetically dwarf plants can be induced to grown tall by using:
  • A
    Auxins
  • B
    Cytokinins
  • ✓
    Gibberellins
  • D
    Phycobillins
Answer
Correct option: C.
Gibberellins
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MCQ 1071 Mark
In living things growth happens $..........?$
  • ✓
    From inside
  • B
    From outside
  • C
    Indefinitely
  • D
    Both $A$ and $C$
Answer
Correct option: A.
From inside
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MCQ 1081 Mark
Which one is incorrect?
  • A
    Epiblast is presumptive ectoderm and mesoderm.
  • B
    Hypoblast is presumptive endoderm.
  • ✓
    Hypoblast is presumptive mesoderm.
  • D
    Upper layer of cells in blastoderm is epiblast.
Answer
Correct option: C.
Hypoblast is presumptive mesoderm.
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MCQ 1091 Mark
Differentiation of shoot is controlled by.
  • A
    High gibberellin : auxin ratio.
  • ✓
    High cytokinin : auxin ratio.
  • C
    High auxin : cytokinin ratio.
  • D
    None of these.
Answer
Correct option: B.
High cytokinin : auxin ratio.
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MCQ 1101 Mark
Dwarfness can be controlled by treating the plant with.
  • A
    Cytokinin.
  • ✓
    Gibberellic acid.
  • C
    Auxin.
  • D
    Antigibberellin.
Answer
Correct option: B.
Gibberellic acid.
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MCQ 1111 Mark
Which response of growth hormone is true for ethylene?
  • A
    Decrease in flower abscission
  • B
    Decreases in femaleness
  • ✓
    Increase in fruit ripening
  • D
    Increase in cell elongation
Answer
Correct option: C.
Increase in fruit ripening
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MCQ 1121 Mark
The stage of rapid cell division just after fertilization is:
  • A
    Organogenesis.
  • ✓
    Cleavage.
  • C
    Gastrulation.
  • D
    Growth.
Answer
Correct option: B.
Cleavage.
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MCQ 1131 Mark
Exponential growth of the plants is express as $W =W_0 \ e^{rt} \ r$ represents.
  • A
    Ability of the plant to produce new cells.
  • B
    Efficiency index.
  • C
    Relative growth rate.
  • ✓
    All of the above.
Answer
Correct option: D.
All of the above.
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MCQ 1141 Mark
Coconut water contains:
  • A
    $\text{ABA}.$
  • B
    Auxin.
  • ✓
    Cytokinin.
  • D
    Gibberellin.
Answer
Correct option: C.
Cytokinin.
Coconut milk is the liquid endosperm in unripened fruit and is rich in plant hormone cytokinin.The other hormones are absent in coconut milk.
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MCQ 1151 Mark
The method that renders the seed coat permeable to water so that embryo expansion is not physically retarded, is:
  • A
    Vernalization.
  • B
    Stratification.
  • C
    Denudation.
  • ✓
    Scarification.
Answer
Correct option: D.
Scarification.
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MCQ 1161 Mark
Gibberellins promote:
  • A
    Seed dormancy
  • B
    Leaf fall
  • ✓
    Seed germination
  • D
    Root elongation
Answer
Correct option: C.
Seed germination
Gibberellin is a plant hormone which is involved in various physiological processes of plants.It is a plant growth regulator.It is promotes stem elongation, seed germination, leaf and fruit senescence, etc. It breaks the seed dormancy that require cold or light to germinate.
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MCQ 1171 Mark
The plant hormone responsible for phototropism in plants is:
  • A
    Cytokinin
  • B
    Abscisic acid
  • C
    Gibberellin
  • ✓
    Auxin
Answer
Correct option: D.
Auxin
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MCQ 1181 Mark
Bananas can be prevented from overripening by:
  • A
    Maintaining them at room temperature
  • B
    Refrigeration
  • C
    Dipping in ascorbic acid solution
  • ✓
    Storing in a freezer
Answer
Correct option: D.
Storing in a freezer
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MCQ 1191 Mark
A ripe mango, kept with unripe mangoes causes their ripening.This is due to the release of a gaseous plant hormone:
  • A
    Auxin
  • B
    Gibberlin
  • C
    Cytokinine
  • ✓
    Ethylene
Answer
Correct option: D.
Ethylene
Ethylene is a gaseous hormone which has many functions such as fruit ripening, flower wilting, and leaf fall. It is unusual because of its gaseous nature. Ethylene brings about change in colour, texture and softens the ripening fruits. Some fruits release ethylene as the ripening begins.
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MCQ 1201 Mark
Tendrils exhibit$/$twining of tendrils is due to:
  • ✓
    Thigmotropism.
  • B
    Seismonasty.
  • C
    Heliotropism.
  • D
    Diageotropism.
Answer
Correct option: A.
Thigmotropism.
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MCQ 1211 Mark
Mowing grass lawn facilitates better maintenance because.
  • A
    Wounding stimulates regeneration.
  • B
    Removal of apical dominance and stimulation of intercalary meristem.
  • C
    Removal of apical dominance.
  • ✓
    Removal of apical dominance and promotion of lateral meristem.
Answer
Correct option: D.
Removal of apical dominance and promotion of lateral meristem.
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MCQ 1221 Mark
In a bundle of green coriander leaves, you will find leaves of different shapes. What does this show?
  • A
    Plasticity.
  • ✓
    Heterophylly.
  • C
    Homophylly.
  • D
    Ornamentation.
Answer
Correct option: B.
Heterophylly.
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MCQ 1231 Mark
A chemical believed to be involved in flowering is:
  • A
    Gibberellin.
  • B
    Kinetin.
  • ✓
    Florigen.
  • D
    $\text{IBA}.$
Answer
Correct option: C.
Florigen.
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MCQ 1241 Mark
Exogenous $\text{GA}$ induces the formation of male flowers on genetically female plants of:
  • A
    Cucurbita
  • B
    Luffa
  • ✓
    Cannabis
  • D
    Carica
Answer
Correct option: C.
Cannabis
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MCQ 1251 Mark
Which one among the following chemicals is used for causing defoliation of forest trees?
  • A
    Malic hydrazide.
  • B
    Phosphon$-D.$
  • ✓
    $2, 4-$dichlorophenoxy acetic acid.
  • D
    None of these.
Answer
Correct option: C.
$2, 4-$dichlorophenoxy acetic acid.
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MCQ 1261 Mark
The photoperiod in plants is perceived at:
  • A
    Meristem.
  • B
    Flower.
  • C
    Floral buds.
  • ✓
    Leaves.
Answer
Correct option: D.
Leaves.
Leaves are the main recipients of light energy and thus are the main player in photo period.
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MCQ 1271 Mark
The main function of abscisic acid in plants is to:
  • A
    Increase the length of cells
  • B
    Promote cell division
  • ✓
    Inhibit growth
  • D
    Promote growth of stem
Answer
Correct option: C.
Inhibit growth
Abscisic acid is the plant hormone, which is responsible for dormancy of seeds and inhibition of seeds.
It stimulates the closure of stomata, inhibit shoot growth, stimulate the storage of proteins in seeds, and so on.
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MCQ 1281 Mark
In horticulture certain plants are trimmed periodically to get denser foliage. This practice utilizes the knowledge of which facet of plant growth?
  • A
    Dedifferentiation.
  • ✓
    Apical Dominance.
  • C
    Abscission.
  • D
    Senescence.
Answer
Correct option: B.
Apical Dominance.
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MCQ 1301 Mark
Anthesis is a phenomenon which refers to:
  • A
    Reception of pollen by stigma.
  • B
    Formation of pollen.
  • C
    Development of anther.
  • ✓
    Opening of flower bud.
Answer
Correct option: D.
Opening of flower bud.
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MCQ 1311 Mark
Which plant growth regulator is the derivative of carotenoids?
  • A
    Auxin.
  • B
    Gibberelic acid.
  • C
    Cytokinin.
  • ✓
    Abscisic acid.
Answer
Correct option: D.
Abscisic acid.
Abscisic acid are the derivatives of carotenoids.
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MCQ 1321 Mark
Natural cytokinins are synthesized in tissues for:
  • A
    Differentiating
  • B
    Senescent
  • ✓
    Dividing
  • D
    Storing food
Answer
Correct option: C.
Dividing
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MCQ 1331 Mark
Which of the following is sprayed for flowering in pineapple?
  • ✓
    Auxins
  • B
    Gibberellins
  • C
    $\text{IAA}$
  • D
    Cytokinin
Answer
Correct option: A.
Auxins
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MCQ 1341 Mark
Maximum growth in roots occurs:
  • A
    At apex
  • B
    In presence of light
  • ✓
    Behind the apex
  • D
    In presence of soil
Answer
Correct option: C.
Behind the apex
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MCQ 1351 Mark
Which of the following hormones hasten the ripening of fruits?
  • A
    Gibberellins.
  • B
    Cytokinins.
  • ✓
    Ethylene.
  • D
    Abscisic Acid.
Answer
Correct option: C.
Ethylene.
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MCQ 1361 Mark
Which hormone promotes rooting in cuttings:
  • A
    Gibberellin
  • B
    Cytokinin
  • ✓
    Auxin
  • D
    None of the above
Answer
Correct option: C.
Auxin
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MCQ 1371 Mark
Which of the following hormones can replace vernalization?
  • A
    Auxin.
  • B
    Cytokinin.
  • ✓
    Gibberellins.
  • D
    Ethylene.
Answer
Correct option: C.
Gibberellins.
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MCQ 1381 Mark
Primary precursor of $\text{IAA}$ is:
  • A
    Phenylalanine.
  • ✓
    Tryptophan.
  • C
    Tyrosine.
  • D
    Leucine.
Answer
Correct option: B.
Tryptophan.
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MCQ 1391 Mark
Seed dormancy is induced by:
  • ✓
    $\text{ABA}$
  • B
    $\text{GA}$
  • C
    Thiourea
  • D
    Cytokinin
Answer
Correct option: A.
$\text{ABA}$
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MCQ 1401 Mark
Which of the following movement is not related to auxin level?
  • A
    Bending of shoot towards light.
  • B
    Movement of root towards soil.
  • ✓
    Nyctinastic leaf movements.
  • D
    Movement of sunflower head tracking the sun.
Answer
Correct option: C.
Nyctinastic leaf movements.
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MCQ 1411 Mark
The response of different organisms to environmental rhythms of light and darkness is called:
  • A
    Phototaxis.
  • ✓
    Photoperiodism.
  • C
    Phototropism.
  • D
    Vernalization.
Answer
Correct option: B.
Photoperiodism.
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MCQ 1421 Mark
The hormone responsible for apical dominance is:
  • ✓
    $\text{IAA}$
  • B
    $\text{GA}$
  • C
    $\text{ABA}$
  • D
    Florigen.
Answer
Correct option: A.
$\text{IAA}$
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MCQ 1431 Mark
Which of the following are the products of redifferentiation?
  • ✓
    Guard cells
  • B
    Bulliform cells
  • C
    Complimentary cells
  • D
    Subsidiary cells
Answer
Correct option: A.
Guard cells
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MCQ 1441 Mark
Plants differ from animals in having:
  • A
    Definite lifespan.
  • ✓
    Localized growth.
  • C
    Indefinite lifespan.
  • D
    Localized growth and indefinite lifespan.
Answer
Correct option: B.
Localized growth.
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MCQ 1451 Mark
Choose the correct answer from the alternatives given. Closing of stomata are induced by:
  • A
    Axing
  • B
    Boxing
  • ✓
    Abscise acid
  • D
    Indole $3-$acetic acid
Answer
Correct option: C.
Abscise acid
$\text{ABA}$ inhibits seed germination. $\text{ABA}$ stimulates the closure of stomata in the epidermis and increases the tolerance of plants to various kinds of stresses.
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MCQ 1461 Mark
Phototropic and geotropic movements are linked to:
  • A
    Gibberellins.
  • B
    Enzymes.
  • ✓
    Auxins.
  • D
    Cytokinins.
Answer
Correct option: C.
Auxins.
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MCQ 1471 Mark
Photoperiodism is associated with:
  • A
    Auxin
  • B
    Chlorophyll
  • C
    Florigen
  • ✓
    Gibberellin
Answer
Correct option: D.
Gibberellin
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MCQ 1491 Mark
Typical plant growth shows $..........$ curve.
  • A
    $J-$shaped.
  • ✓
    $S-$shaped.
  • C
    $I-$shaped.
  • D
    Parabolic.
Answer
Correct option: B.
$S-$shaped.
Typical plant growth represents sigmoid curve.
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MCQ 1501 Mark
Which one of the following is a long day plant?
  • ✓
    Wheat.
  • B
    Soyabean.
  • C
    Bajra.
  • D
    Tobacco.
Answer
Correct option: A.
Wheat.
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MCQ 1511 Mark
Which growth hormone accerlates the malting process in brewing industry?
  • A
    Auxins.
  • ✓
    Gibberellins.
  • C
    Ethylene.
  • D
    Cytokinins.
Answer
Correct option: B.
Gibberellins.
Gibberellins especially $\text{GA}3$ is used to speed up the malting process in brewing industry.
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MCQ 1521 Mark
What reason will you assign for coconut milk used in tissue culture?
  • A
    Gibberellins.
  • ✓
    Cytokinins.
  • C
    Auxins.
  • D
    Ethylene.
Answer
Correct option: B.
Cytokinins.
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MCQ 1531 Mark
Growth regulator ethylene is used for:
  • A
    Retarding ripening of tomatoes
  • ✓
    Speeding up ripening of fruits
  • C
    Slowing down ripening of apples
  • D
    Both $B$ and $C$
Answer
Correct option: B.
Speeding up ripening of fruits
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MCQ 1541 Mark
$\text{ABA}$ acts antagonistic to:
  • A
    Ethylene.
  • B
    Cytokinin.
  • ✓
    Gibberlic acid.
  • D
    $\text{IAA}.$
Answer
Correct option: C.
Gibberlic acid.
Abscisic acid is an antagonist to gibberellins as shown in the table given.
Abscisic Acid Gibberellic acid
It inhibits Growth. It promotes growth.
It promotes the dormancy of seeds, buds and tubers. It overcomes the natural dormacy of seeds, tubers, etc.
It inhibits the synthesis of $\text{RNA}$ and proteins. $\text{IT}$ promotes the synthesis of $\text{RNA}$ and Proteins.
causes abscission of flowers and fruits. Promotes development of fruits.
Promotes leaf senescence. Prevents leaf Senescence.
Promotes stomatal closure. Promotes stomatal opening.
Prevents anylase Activity. Promotes anylase activity during seed Germination.
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MCQ 1551 Mark
Klinostat is employed in the study of:
  • A
    Osmosis.
  • ✓
    Growth movements.
  • C
    Photosynthsis.
  • D
    Respiration.
Answer
Correct option: B.
Growth movements.
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