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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