Question

Movement of molecules from their lower concentration to their higher concentration is called

• A. Diffusion
• B. Osmosis
• C. Active transport
• D. Transpiration

Answer 1

The correct option is C

Active transport

The correct option is C.

Explanation of the correct option:

1. The movement of molecules from their lower concentration to their higher concentration through a cell membrane is called active transport.
2. The movement is against the concentration gradient which requires energy.

Explanation for incorrect options:

Option (A):

1. Movement of molecules from high to low concentration is called diffusion.
2. No energy is required.

Option (B):

1. The movement of water via a semipermeable membrane from a region of its higher concentration to a region of its lower concentration is called osmosis.
2. The presence of a semipermeable membrane is a must.

Option (D):

Loss of water vapour from the surface of the plant, mainly by stomata on the leaves is transpiration.

Final answer: The movement of molecules from their lower concentration to their higher concentration is called active transport.