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BIOLOGY M.C.Q (1 Marks)

Plant Growth and Development · MP Board (MPBSE) STD 11 Science (Madhya Pradesh - English Medium). 155 questions.

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M.C.Q (1 Marks)

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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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M.C.Q (1 Marks) - BIOLOGY STD 11 Science Questions - Vidyadip