AP BIOLOGY

Detailed explanation-1: -Water absorption through roots can be increased by keeping the plants under the fan. Air movements carry away water vapour from leaves and this prevents air around them from becoming saturated with water vapour.

Detailed explanation-2: -Transpiration is the process that is responsible for the movement of water in plants. When there is an increase in transpiration, there will be greater transpiration pull generated in plants leading to increased water absorption by roots.

Detailed explanation-3: -Water moves from the soil to the roots, stems, and ultimately the leaves, where transpiration occurs. The roots absorb enough water to compensate for water lost to transpiration. Rapid absorption is aided by root hairs, which extend from epidermal cells, increasing surface area (Figure 17.1.

Detailed explanation-4: -Active absorption refers to the absorption of water by roots with the help of adenosine triphosphate, generated by the root respiration: as the root cells actively take part in the process, it is called active absorption.

Detailed explanation-5: -The correct option is (c) as by keeping the plant under fan, transpiration increases.