Question

Water supply in the plant is due to
A.Osmosis
B.Guttation
C.Cohesion force
D.Imbibition

Answer 1

Hint: To absorb water from the soil, the solute concentration should be high and water potential should be low. This will help in water movement from soil to the xylem tissues present in the roots of the plant.

Complete answer:
1.Osmosis: It is a process in which molecules of solvent pass from semipermeable membrane and material moves from low concentrated solution to the higher concentrated solution. It is a spontaneous process and generally takes place in nature. Example- Movement of components across the plasma membrane.

2.Guttation: This is the process of water loss from the surface or tips of the plant leaves also called xylem sap. This process generally happens during the night times or early mornings. Transpiration does not take place during night times because stomata are closed. Thus, accumulated water comes out via guttation. Example- grasses.

3.Cohesion force: It is a property of the material via which molecules tend to attract each other and get stuck to each other. It is an intrinsic property of material which can be affected by the shape and structure of the molecules. Example- Water molecules attract each other.

4.Imbibition: It is a type of diffusion process in which water is absorbed by solid-colloids, leading to increase in the water volume. Example- Absorption of water by seeds.

Hence, the correct answer is option (A)

Note: During osmosis, movement from hypertonic solution to hypotonic solution takes place. This is a very important process which maintains the equilibrium between outside and inside concentrations of the cell.