Question

Water enters into the root hair from the soil by

• A. Diffusion
• B. Active transport
• C. Reverse osmosis
• D. Osmosis

Answer 1

The correct option is D Osmosis

Diffusion is a process by which molecules intermingle as a result, of their kinetic energy of random motion. It is free movement of a substance from a region of higher concentration to lower concentration. For example, dissolving a coloured dye in water.
Active transport is a transport of substance against the concentration gradient using energy/ATP.
Reverse osmosis uses a method in which pressure is applied to overcome osmotic pressure. The semipermeable membrane is used in this process.

Osmosis is a process in which water molecules diffuse through a semipermeable membrane from more dilute solution to less dilute solution. Root hairs are highly osmotic than soil. So, water easily enters in the roots.