Question

Which one of the following processes requires an input of energy?

• A. Active transport
• B. Diffusion
• C. Facilitated diffusion
• D. Osmosis

Answer 1

The correct option is A Active transport

An input of energy is required in the process of active transport as it involves the movement of ions or molecules across a cell membrane from low to high concentration. The movement requires energy to maintain the electrochemical gradient.

So, the correct option is 'Active transport'.