AP BIOLOGY

Detailed explanation-1: -The force that assists in pulling water up from roots to leaves is known as the transpiration pull or the suction force. A portion of the water in leaves is used for photosynthesis, and any extra water is discharged into the atmosphere through stomata.

Detailed explanation-2: -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-3: -This is called the transpirational pull, and is responsible for the transport of most of the water from the roots to the rest of the plant. Root pressure is the hydrostatic pressure that develops in the root cells when water enters them by osmosis.

Detailed explanation-4: -The cohesion-tension hypothesis is the most widely-accepted model for movement of water in vascular plants. Cohesion-tension essentially combines the process of capillary action with transpiration, or the evaporation of water from the plant stomata.

Detailed explanation-5: -Transpiration pull is the most widely accepted theory for the ascent of sap from roots to the shoot system. It is also called the cohesion tension theory. This mechanism was proposed by Dixon and Jolly in 1894. Tension or negative pressure in the water column of xylem channels results in this upward pull.