Question

Movement of molecules from the region of their higher concentration to the lower concentration region without the involvement of a semi-permeable membrane is

• A. Active transport
• B. Diffusion
• C. Osmosis
• D. None of these

Answer 1

The correct option is B

Diffusion

Explanation of the correct option

The correct option is B:

1. Diffusion is the net movement of molecules from a region of higher concentration to a region of lower concentration without the involvement of a semi-permeable membrane.
2. It is a passive process i.e. energy requirement for the movement is not required.

Explanation of the incorrect options

Option A:

1. When the molecules flow against a concentration gradient, i.e. from a lower to a higher concentration region, with the expenditure of energy is known as active transport.
2. There is the involvement of a semi-permeable membrane through which the passage of molecules takes place.
3. This process also requires energy.

Option C:

1. Osmosis is the process of moving water molecules from low solute concentration to high solute concentration through a semi-permeable membrane.