AP BIOLOGY

Detailed explanation-1: -Passive transport requires no energy input, as compounds are able to move freely across the membrane based only on a favourable concentration gradient (Figure 1.11).

Detailed explanation-2: -Passive transport, most commonly by diffusion, occurs along a concentration gradient from high to low concentration. No energy is necessary for this mode of transport.

Detailed explanation-3: -Passive transport is a naturally occurring phenomenon and does not require the cell to expend energy to accomplish the movement. In passive transport, substances move from an area of higher concentration to an area of lower concentration in a process called diffusion.

Detailed explanation-4: -Passive transport: This does not require any energy expenditure as it occurs along the concentration gradient of the molecule being translocated. Examples include simple diffusion, facilitated diffusion, and osmosis.

Detailed explanation-5: -Passive transport is important for the proper functioning of plants and animals. In plants, for instance, gases like carbon dioxide and oxygen diffuse into and out of a plant cell via stomatal openings according to their respective concentration gradients.