Question

Exchange of substances between individual cells and their environments takes place by

• A. Osmosis
• B. Diffusion
• C. Active transport
• D. All of the above

Answer 1

Answer: (D)

All of the above

Diffusion is the transport according to the concentration gradient. Gaseous exchange takes place through diffusion. Osmosis is diffusion of solvent across a semi-permeable membrane. It also follows the concentration gradient. Uptake of solvent by plant cells is an example. Active transport requires energy expenditure and occurs against concentration gradient.

Thus, the correct answer is option D.