Question

Movement of materials against concentration gradient is achieved by

• A. Active trasnport
• B. Passive transport
• C. Diffusion
• D. Osmosis

Answer 1

Answer: (A)

Active trasnport

• Active transport is the transport where the direct expenditure of energy takes place and the molecules move against the gradient which is from lower concentration to the higher concentration.
• Passive absorption is the absorption which takes place without expenditure of energy. The water molecules move from higher concentration to the lower concentration which is towards the gradient.
• In diffusion, the ions or molecules randomly diffuses the semipermeable membrane along the concentration gradient.
• Osmosis is the process of diffusion of molecules from the region of higher concentration to the lower concentration through a semipermeable membrane.

So, the correct answer is option A.