Question

leaves of plants fall off in a particular season give reason

Answer 1

In the fields of horticulture and botany, the term deciduous means "falling off at maturity" and "tending to fall off", in reference to trees and shrubs that seasonally shed leaves, usually in the autumn; to the shedding of petals, after flowering; and to the shedding of ripe fruit.
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Answer 2

Answer:

Leaves of plants usually fall off during autumn.  

Explanation:

Autumn precedes the advent of winter which is a dry season with fewer water supplies for the plants. The plants shed off their leaves at the beginning of autumn to prepare themselves for the upcoming winter.  

The leaves of plants lose a large amount of water by transpiration. During the winter months, his water can be used by the plats to sustain itself through the harsh season. Hence plants lose their leaves in autumn.