Question

The leaves in desert plants are either absent, or present in the form
of spines. Give reason

Answer 1

Explanation:

leaves are reduced to spines in a cactus , so that the water does not get evaporated with the heat of the SUN . They are present in hotdeserts which are scarce in water so in order to reduce the loss of water by Transpiration from the surface of the leaves, its leaves are reduced to spines. 

Answer 2

Answer:

Desert plants lose very little water through transpiration. The leaves in desert plants are either absent, very small, or they are present in the shape of spines. This helps in reducing loss of water from the leaves through transpiration.