Biology

The correct answer is: A.Plant root absorbing mineral ions from the soil.

Explanation:

Active transport involves the movement of substances against their concentration gradient, which requires energy (usually in the form of ATP).

The examples provided:

A.Plant root absorbing mineral ions from the soil: This is an example of active transport. Roots use energy to pump mineral ions (such as potassium, nitrates, or phosphorus) from the soil, where the concentration of ions is lower, into the root cells, where the concentration is higher.

B.Movement of oxygen from alveoli into red blood cell: This is an example of diffusion, a passive transport process wh...