Q.
A plant growth regulator which is a derivative of carotenoids
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a
stimulates the closure of stomata.
b
causes fruits like apple to elongate and improve its shape.
c
promotes nutrient mobilisation which helps in the delay of leaf senescence.
d
is used to initiate flowering and for synchronising fruit-set in pineapples.
answer is A.
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Detailed Solution
Abscisic acid is a derivative of carotenoids. ABA stimulates the closure of stomata and increases the tolerance of plants to various kinds of stresses. Therefore, it is also called the stress hormone.
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