A) Diffusion
B) Osmosis
C) Surface tension
D) Active transport
Correct Answer: C
Solution :
Diffusion, osmosis and active transport help in transport of molecules or ions. Diffusion is the movement of particles i.e., molecules ions of gases, liquids and solids from the region of their higher concentration to the region of their lower concentration. Osmosis is the movement of water or solvent from a dilute solution to concentrated solution, through semipermeable membrane. Active transport occurs against concentration gradient, metabolic energy is used in this transport. Surface tension is a force per unit length works on surface of a liquid. Due to surface tension rain drops are spherical in shape.
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