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NEET-UG Biology

Ethylene and abscisic acid — practice questions

5 questions in the bank on this idea. Below are 5 of them, exactly as they appear in a test.

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  1. Question 1 · difficulty L1 · recall

    Fruit ripening is most closely promoted by which plant growth regulator?

    • A. Ethylene
    • B. Auxin
    • C. Cytokinin
    • D. Gibberellin

  2. Question 2 · difficulty L2 · understanding

    During water stress, which regulator commonly promotes stomatal closure?

    • A. Gibberellin
    • B. ABA
    • C. Cytokinin
    • D. Auxin

  3. Question 3 · difficulty L3 · application

    A climacteric fruit is exposed to a small amount of ethylene. What response is most likely?

    • A. Cell division stops everywhere
    • B. Dormancy is permanently induced
    • C. Ripening is accelerated
    • D. Root pressure falls to zero

  4. Question 4 · difficulty L3 · understanding

    Which of the following is not an inhibitory substance governing seed dormancy?

    • A. Para-ascorbic acid
    • B. Abscisic acid
    • C. Gibberellic acid
    • D. Phenolic acid

  5. Question 5 · difficulty L4 · analysis

    A seed remains dormant despite otherwise favourable conditions. Which hormonal situation most strongly favours continued dormancy?

    • A. Relatively high auxin
    • B. Relatively high gibberellin
    • C. Relatively high cytokinin
    • D. High ABA influence

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