Sample Questions — Plant growth regulators
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MCQ
Assertion (A): Ethephon is a commonly used source of ethylene in agriculture.
Reason (R): Ethephon is absorbed and releases ethylene slowly inside the plant.
✅ Correct Answer: A
Ethephon is widely used in agriculture; it is absorbed and releases ethylene slowly in plant tissues.
MCQ
Which PGR enhances the respiration rate during fruit ripening?
✅ Correct Answer: C
Ethylene increases respiration rate during ripening, known as the climacteric rise.
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MCQ
Which of the following is an indole compound acting as a plant growth regulator?
✅ Correct Answer: C
IAA is classified as an indole compound and is a naturally occurring auxin involved in plant growth regulation.
MCQ
What is the primary function of auxins and gibberellins?
✅ Correct Answer: D
Auxins, gibberellins, and cytokinins belong to the group of PGRs involved in growth-promoting activities.
MCQ
Select the correct statements about auxins:
I. They are found in shoot tips
II. They control xylem differentiation
III. They inhibit root formation
IV. They induce parthenocarpy
✅ Correct Answer: B
Auxins occur in shoot tips, regulate vascular differentiation, and induce parthenocarpy. They promote, not inhibit, root formation.
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