AP BIOLOGY

Detailed explanation-1: -A transpiration pull could be simply defined as a biological process in which the force of pulling is produced inside the xylem tissue. This force helps in the upward movement of water into the xylem vessels. In this process, loss of water in the form of vapours through leaves are observed.

Detailed explanation-2: -The suction force (negative pressure) created by transpiration from the leaves’ surface draws water from the soil and roots through the xylem. Water is sucked up as a result of the xylem vessel.

Detailed explanation-3: -Transpiration pull or the suction force is the force which aids in drawing the water upward from roots to leaves. In leaves, some amount of water is used for photosynthesis and excess water is released into atmosphere through openings called as stomata.

Detailed explanation-4: -The major driving force for the transport of water through xylem in plants during day is transpiration. It creates a suctional force called the transpiration pull which pulls the water all the way up even in tall trees. During the night, root pressure is reponsible for transportation of water.

Detailed explanation-5: -Solution. As water is lost from the leaf surface by transpiration, more water molecules are pulled up due to the tendency of water molecules to remain joined i.e. cohesion. This produces a continuous column of water throughout the stem which is known as ‘transpiration pull’.