Zoology - Organisms and Populations Question with Solution | TestHub

Many desert plants have a thick cuticle on their leaf surfaces and have their stomata arranged in deep pits (sunken) to minimise water loss through transpiration. They also have a special photosynthetic pathway (CAM) that enables their stomata to remain closed during day time.  Some desert plants likeOpuntia, have no leaves – they are reduced to spines– and the photosynthetic function is taken over by the flattened stems.