Question

Read the assertion and reason carefully to mark the correct option in question.

Assertion: ABA is also called stress hormone.

Reason: ABA stimulates the closure of stomata in the epidermis and increase the tolerance of plants to various kinds of stresses.

Answer 1

Assertion-Reason relation
Abscisic acid helps the plant deal with stress in following ways:
$\bullet$ Decreases plant growth metabolism

$\bullet$ Inhibits plant growth

$\bullet$ Promotes seed development and maturation and conservation of reserve food

$\bullet$ Promotes seed dormancy

$\bullet$ Promotes closure of stomata and hence conservation of water

Hence, the given reason- “ABA stimulates the closure of stomata in the epidermis and increase the tolerance of plants to various kinds of stresses” is true and correct explanation of the given assertion.