AP BIOLOGY

Detailed explanation-1: -Diffusion is the net movement of molecules from an area of higher concentration to an area of lower concentration. The difference in the concentration of a substance between two areas is called the concentration gradient. Diffusion occurs in liquids and gases when their particles collide randomly and spread out.

Detailed explanation-2: -Diffusion is defined as the net movement of molecules from an area of greater concentration to an area of lesser concentration. The molecules in a gas, a liquid or a solid are in constant motion due to their kinetic energy. Molecules are in constant movement and collide with each other.

Detailed explanation-3: -Diffusion: Diffusion is the movement of particles from an area of higher concentration to lower concentration. The overall effect is to equalize concentration throughout the medium.

Detailed explanation-4: -As diffusion occurs solute molecules move towards where they are low in concentration. Most of the solute molecules are moving to the low concentration area. Some might move towards the high concentration area as well; but these are very few in number. They move because they have kinetic energy.

Detailed explanation-5: -The movement of solute particles from low to high concentration is known as C: active transport. During active transport, the movement of solute particles occurs against the concentration gradient. This means that solute particles move from an area of lower concentration to an area of higher concentration.