AP BIOLOGY

Detailed explanation-1: -the stomata in leaves. the cuticle in the leaves and young stem. the lenticels in old stem.

Detailed explanation-2: -Leaf stomata are the primary sites of transpiration and consist of two guard cells that form a small pore on the surfaces of leaves. The guard cells control the opening and closing of the stomata in response to various environmental stimuli and can regulate the rate of transpiration to reduce water loss.

Detailed explanation-3: -Transpiration is defined as the physiological loss of water in the form of water vapor, mainly from the stomata in leaves, but also through evaporation from the surfaces of leaves, flowers, and stems.

Detailed explanation-4: -Leaves contain a very large number of stomata for gaseous exchange and there is little resistance to movement of water vapour through these pores. Moreover, the leaves have a large surface area. The greater the surface area, the greater will be the loss of water by transpiration.

Detailed explanation-5: -The loss of water (in the form of water vapour) from the aerial parts of the plants is known as transpiration. It primarily occurs at the leaves while their stomata are open for the exchange of CO2 and O2 during photosynthesis.