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BIOLOGY M.C.Q (1 Marks)

MODEL PAPER 6 · Gujarat Board (GSEB) STD 11 Science (GSEB - English Medium). 12 questions.

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M.C.Q (1 Marks)

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12 questions · self-marked practice — reveal the answer and mark yourself.

MCQ 11 Mark
Which of the following pair of factors are considered favourable for the formation of oxyhaemoglobin?
  • A
    Low $pO _2$ and low $H ^{+}$ concentration
  • B
    High$H ^{+}$ concentration and high $pO _2$
  • C
    Low $pCO _2$ and low temperature
  • D
    Low $H ^{+}$ concentration and high $pCO _2$
Answer
(c) Low $pCO _2$ and low temperature
Explanation: In the alveoli, where there is high $pO _2$ low $pCO _2$, lesser $H ^{+}$ concentration, and lower temperature, the factors are all favourable for the formation of oxyhaemoglobin.
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MCQ 21 Mark
Which excretory organ is used by cockroaches?
  • A
    Malpighian tubules
  • B
    Protonephridia
  • C
    Kidneys
  • D
    Nephridia
Answer
(a) Malpighian tubules
Explanation: The excretory organ of cockroach is the malpighian tubules. It is found at the junction of the midgut and hindgut and is about 150 in number. They are fine, yellow coloured and branched threads present in bundles. They lie freely in the haemolymph.
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MCQ 31 Mark
Non-flowering plants belong to:
  • A
    Dicots
  • B
    Monocots
  • C
    Phanerogams
  • D
    Cryptogams
Answer
(d) Cryptogams
Explanation: The cryptogams are flowerless and seedless plants. They are simple plants like algae, mosses, and fems which do not produce flowers, fruits, and seeds. Cryptogams are considered as lower plants.
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MCQ 41 Mark
How many numbers of gibberellins are distributed in different organisms?
  • A
    More than 10
  • B
    More than 100
  • C
    More than 150
  • D
    More than 200
Answer
(b) More than 100
Explanation: There are more than 100 gibberellins reported from widely different organisms such as fungi and higher plants. They are denoted as GA1, GA2, GA3, and so on.
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MCQ 51 Mark
The lymph in frog lacks:
  • A
    RBC and plasma
  • B
    Plasma and WBCS
  • C
    WBCs and few proteins
  • D
    RBCs and few proteins
Answer
(d) RBCs and few proteins
Explanation: The lymph is different from the blood. It is known as tissue fluid. Lymph is yellowish in colour as it lacks RBCs and few proteins.
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MCQ 61 Mark
Pila globosa (apple snail):
i. Is adapted to lead an amphibious life.
ii. Is both ureotelic and ammonotelic.
iii. Is both ammonotelic as well as uricotelic.
iv. Is both ureotelic and uricotelic.
  • A
    Statement (ii) and (iii) are correct
  • B
    Statement (1) and (ii) are correct
  • C
    Statement (i) and (iv) are correct
  • D
    Statement (i) and (iii) are correct
Answer
(d) Statement (i) and (iii) are correct
Explanation: Apple snail or Pila globosa is adapted to lead an amphibious life both on land as well as water. It is both ammonotelic as well as uricotelic can release ammonia and uric acid.
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MCQ 71 Mark
The most efficient converter of sunlight is:
  • A
    Tomato
  • B
    Papaya
  • C
    Sugarcane
  • D
    Potato
Answer
(c) Sugarcane
Explanation: The efficiency of uncultivated plant life is only about 0.2%. In sugar cane, which is one of the most efficient plants, about 8% of the light absorbed by the plant is preserved as chemical energy. It shows the high efficiency of CO₂ fixation because of the Hatch and Slack cycle.
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MCQ 81 Mark
Insect of the family Chironomidae like Chironomous larvae are also known as bloodworms since:
  • A
    They contain haemocyanin as their respiratory pigment
  • B
    They are blood parasites
  • C
    They have only blood
  • D
    They contain haemoglobin as their respiratory pigment
Answer
(d) They contain haemoglobin as their respiratory pigment
Explanation: Insects of family Chironomidae eg. Chironomus commonly known as the harlequin fly is a species of the non- biting midge. Their larvae are known by the common name of blood worm due to their red colouration. The red colouration is because they contain haemoglobin as their respiratory pigment.
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MCQ 91 Mark
The quiescent centre is found in the plant at:
  • A
    Root tips
  • B
    Leaf tip
  • C
    Cambium
  • D
    Shoot tips
Answer
(a) Root tips
Explanation: A quiescent centre is a small group of cells with low mitotic activity. It is found at the tips of growing roots in the root meristem.
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MCQ 101 Mark
The inhibition of enzyme activity by the presence of a chemical that competes with the substrate for binding to the active site of the enzyme is called:
  • A
    Substrate analogue
  • B
    None-competitive inhibitor
  • C
    Irreversible inhibition
  • D
    Reversible inhibition
Answer
(a) Substrate analogue
Explanation: The inhibition of enzyme activity by the presence of a chemical that competes with the substrate for binding to the active site of the enzyme is called substrate analogue.
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MCQ 111 Mark
During micturition, the muscles of urinary bladder, and urethral sphincters will:
  • A
    Keep expanding
  • B
    Show fatigue
  • C
    Contract and relax respectively
  • D
    Relax and contract respectively
Answer
(c) Contract and relax respectively
Explanation: The CNS passes on motor messages to initiate the contraction of smooth muscles of the bladder and simultaneous relaxation of the urethral sphincter causing the release of urine.
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MCQ 121 Mark
Carolus Linnaeus is associated with:
  • A
    Law of limiting factor
  • B
    Binomial nomenclature
  • C
    Origin of species
  • D
    Inheritance of acquired character
Answer
(b) Binomial nomenclature
Explanation: Carolus Linnaeus is associated with Binomial nomenclature in which the name of the organism consists of the genus name and species name.
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