A) Osmosis
B) Diffusion
C) Active transport
D) Passive transport
Correct Answer: C
Solution :
Active transport is the only phenomenon of transportation which uses energy in the form of ATP to pump molecules or ions against a concentration gradient (i.e., low to high concentration). This is mainly carried out by the carrier proteins in the plasma membrane. While, the other methods given in the options such as diffusion transport of solvent or solute molecules (i.e., across a membrane) osmosis (i.e., net movement of solvent molecules across a semi-permeable membrane) and passive transport (i.e., movement of biomolecules or other substances across cell membrane) does not require the expenditure of energy for the transportation of molecules or ions.
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