AP BIOLOGY

Detailed explanation-1: -Essentially all of the water used by land plants is absorbed from the soil by roots.

Detailed explanation-2: -Water is necessary for photosynthesis, which is how plants use energy from the sun to create their own food. During this process, plants use carbon dioxide from the air and hydrogen from the water absorbed through their roots and release oxygen as a byproduct. This exchange occurs through pore-like stoma on the leaves.

Detailed explanation-3: -The absorbed water is passed to different parts of the plant through the roots and used to carry out distinct functions. Water, sunlight, and carbon dioxide are the essential components of photosynthesis. Thus, photosynthesis is carried out only in the presence of water, which is absorbed by the roots in plants.

Detailed explanation-4: -Plants absorb water through their entire surface – roots, stems and leaves. However, the majority of water is absorbed by root hairs. Root hairs are thin-walled uni-cellular outgrowths of epidermis.

Detailed explanation-5: -The plants absorb water from the soil with the help of root hair through osmosis. The diffusion of water molecules through a semi-permeable membrane is called osmosis. Root hair absorbs water from soil through osmosis. Water will be absorbed by root hairs by osmosis as the environment in the soil is hypotonic.