Q11
Hormone responsible for apoptosis (leaf fall) is
Correct Answer
Option A
Solution
(a) ABA (abscisic acid) is responsible for leaf fall/senescence.
Plant Growth and Development
Q12
What breaks bud dormancy of potato tuber?
Correct Answer
Option A
Solution
(a) Gibberellins break bud dormancy in potato tubers.
Q13
Dwarfness can be controlled by treating the plant with
Correct Answer
Option B
Solution
(b) Gibberellic acid reverses dwarfism by stimulating internode elongation.
Q14
Seed dormancy is due to
Correct Answer
Option B
Solution
(b) ABA induces seed dormancy; ethylene can break dormancy in some plants.
Q15
What reason will you assign for coconut milk used in tissue culture?
Correct Answer
Option B
Solution
(b) Coconut milk contains cytokinins which stimulate cell division in tissue culture.
Q16
Plants deficient of zinc show its effect on the biosynthesis of plant growth hormone
Correct Answer
Option B
Solution
(b) Zinc is a component of auxin (IAA) biosynthesis; its deficiency reduces auxin levels.
Q17
Gibberellins promote
Correct Answer
Option A
Solution
(a) Gibberellins break seed dormancy and promote germination.
Q18
Phytochrome is involved in
Correct Answer
Option C
Solution
(c) Phytochrome mediates photoperiodic responses, including flowering.
Q19
Which of the following hormones can replace vernalisation?
Correct Answer
Option C
Solution
(c) Gibberellins can substitute for the cold treatment required in vernalization.
Q20
Which one increases in the absence of light?
Correct Answer
Option C
Solution
(c) Etiolation in darkness causes excessive internode elongation.
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