AP BIOLOGY

Detailed explanation-1: -Passive transport occurs when substances cross the plasma membrane without any input of energy from the cell. No energy is required because the substances are moving from an area where they have a higher concentration to an area where they have a lower concentration.

Detailed explanation-2: -Not everything enters the cell through passive transport. Only the smallest molecules like water, carbon dioxide, and oxygen can freely diffuse across cell membranes. Larger molecules or charged molecules often require an input of energy to be transported into the cell.

Detailed explanation-3: -There are two basic ways that substances can cross the plasma membrane: passive transport, which requires no energy; and active transport, which requires energy.

Detailed explanation-4: -Diffusion is a passive process which means it does not require energy. Small particles diffuse faster than large ones. Eg substances like oxygen, carbon dioxide and glucose move in and out of cells by diffusion.

Detailed explanation-5: -There are four different types of Passive membrane transport, these are: Diffusion, Osmosis, Facilitated diffusion and Filtration. Diffusion is the net overall movement of particles from an area of high concentration to an area of low concentration OF SOLUTE.