NEET BIOLOGY

Detailed explanation-1: -As the 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 (cohesion), and thus to produce a continuous column of water through the stem is called transpiration pull.

Detailed explanation-2: -The stream of water and solutes flowing from the roots to the leaves through the stem is called the transpiration stream. The water from this stream is then lost through transpiration from the leaves.

Detailed explanation-3: -The upward movement of water in a plant towards the stem and leaves is called ascent of sap.

Detailed explanation-4: -The continuous evaporation of water (or transpiration) from the cells of a leaf crates a kind of suction which pulls up water through the xylem vessles. Thus, transpiration helps in the upward movement of water and dissolved minerals from the roots to the leaves through the stem.

Detailed explanation-5: -Transpiration (evaporation) occurs because stomata are open to allow gas exchange for photosynthesis. As transpiration occurs, it deepens the meniscus of water in the leaf, creating negative pressure (also called tension or suction).