AP BIOLOGY

Detailed explanation-1: -The difference in the concentration of a substance between two areas is called the concentration gradient . The bigger the difference, the steeper the concentration gradient and the faster the molecules of a substance will diffuse. The direction of diffusion is said to be ‘down’ or ‘with’ the concentration gradient.

Detailed explanation-2: -Answer and Explanation: The different concentration of substances from one region to another is called concentration gradient. The concentration gradient takes place when there is a difference in concentration (inside and outside) takes place in cells.

Detailed explanation-3: -Moving against a concentration gradient means that the substance is moving from a low concentration to a high concentration. Moving down (descending) a concentration gradient means that the substance is moving from high concentration area to a low concentration area.

Detailed explanation-4: -A concentration gradient occurs when the concentration of particles is higher in one area than another. In passive transport, particles will diffuse down a concentration gradient, from areas of higher concentration to areas of lower concentration, until they are evenly spaced.

Detailed explanation-5: -The difference between the concentration of a substance in two areas forms a concentration gradient. The rate of diffusion is directly proportional to the concentration gradient. Higher the concentration gradient, the faster the rate of diffusion.