AP BIOLOGY

Detailed explanation-1: -Transpiration is a process that involves loss of water vapour through the stomata of plants. The loss of water vapour from the plant cools the plant down when the weather is very hot, and water from the stem and roots moves upwards or is ‘pulled’ into the leaves.

Detailed explanation-2: -Water is lost by transpiration in the form of water vapor. Water vapor is almost completely devoid of dissolved salts or solutes, therefore water lost by transpiration is for all practical purposes, pure water.

Detailed explanation-3: -Plants have little pores (holes or openings) on the underside of their leaves, called stomata. Plants will absorb water through their roots and release water as vapor into the air through these stomata. To survive in drought conditions, plants need to decrease transpiration to limit their water loss.

Detailed explanation-4: -It is estimated that approximately 99% of the water is lost during transpiration by the plants.

Detailed explanation-5: -Ensuring the cooling of plant – the loss of water in the form of water vapour from plants helps the plant to cool down during hot days. Transpirational pull-which is a result of evaporation of water from surfaces of leaves through stomata. This pull helps water to be drawn up in the xylem vessels.