Question

Water absorption through roots can be increased by keeping the plants
A) In the shade
B) In dim light
C) Under fan
D) Covered with polythene bag

Answer 1

Hint:Absorption of water through the roots is directly proportional to the process of transpiration.

Complete answer:
In plants, xylem is the water-conducting tissue. Translocation of water and minerals from xylem is unidirectional (water goes from root to shoot but does not go from shoot to root). The water from roots traverses the entire shoot length and then to the leaves, flowers, fruits, and other plant parts. In the leaves, there is a process occurring called transpiration. Transpiration is the process of loss of water from the stomata (pores in the leaves). As the water is evaporated there is a development of concentration gradient which pulls water from the roots to the plant parts. This is called Transpiration pull.
Water absorption is directly dependent on the process of transpiration. As the transpiration increases water absorption through roots increases.
So the correct answer is Water absorption through roots can be increased by keeping the plants under the fan.
When plants are kept under the fan, the rate of evaporation of water is increased resulting in the rapid increase in the process of transpiration. As transpiration increases there is a greater transpiration pull on the water. Which leads to increased absorption of water through roots.

Hence the correct answer is option ‘C’.

Note:Water absorption is affected by many factors like temperature, the available water content in the soil, soil aeration, humidity in the atmosphere, light intensity, etc.