NEET-UG Biology · Class 11
Ethylene and abscisic acid — NEET & JEE Questions
Ethylene and abscisic acid is a topic in Plant Growth and Development, a Class 11 Biology chapter of the NEET-UG syllabus. TestBudy holds 12 published NEET-UG questions on Ethylene and abscisic acid, each with the marking scheme of the real paper.
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Ethylene and abscisic acid MCQs with solutions
10 of the 12 published questions on this topic, exactly as they appear in a test. Answers and worked solutions come with your result rather than on this page.
Fruit ripening is most closely promoted by which plant growth regulator?
- A. Ethylene
- B. Auxin
- C. Cytokinin
- D. Gibberellin
During water stress, which regulator commonly promotes stomatal closure?
- A. Gibberellin
- B. ABA
- C. Cytokinin
- D. Auxin
Which statement best describes ethylene as a plant growth regulator?
- A. It is a gaseous hormone strongly associated with fruit ripening
- B. It is a steroid hormone that closes stomata
- C. It is a mineral nutrient needed for chlorophyll
- D. It is the principal pigment of photosynthesis
Abscisic acid is commonly associated with
- A. stress responses and promotion of stomatal closure
- B. rapid fruit ripening as its main role
- C. cell-wall digestion during cytokinesis
- D. photolysis of water
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
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
A climacteric fruit is harvested unripe and then exposed to ethylene. What response is most likely?
- A. Accelerated ripening
- B. Permanent inhibition of respiration
- C. Immediate seed germination only
- D. Complete prevention of softening
During severe water shortage, a plant accumulates ABA. Which immediate response helps conserve water?
- A. Closure of stomata
- B. Opening of stomata
- C. Rapid leaf expansion
- D. Increased transpiration
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
A storage facility wants to slow ripening of ethylene-sensitive fruits. Which strategy is most directly useful?
- A. Reduce ethylene accumulation around the fruits
- B. Add extra ethylene continuously
- C. Increase exposure to ripe fruits producing ethylene
- D. Block ventilation so ethylene builds up
Common mistakes in Ethylene and abscisic acid
Recorded against questions in this topic that are not shown above, so none of these points at an answer you can see on this page.
- Attributes ABA insensitivity to unrelated reproductive or photoreceptor defects.
- Uses plant-hormone names interchangeably without matching their characteristic roles.
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