AP BIOLOGY

Detailed explanation-1: -Diffusion is a method of movement of substances within cells, as well as for movement of essential small molecules across the cell membrane. Single-celled and simple multicellular plants do not have complex structures like xylem and phloem and the movement of substances take place by diffusion.

Detailed explanation-2: -Ans. In unicellular plants like Chlamydomonas, transport of material takes place by a process called diffusion.

Detailed explanation-3: -When the surface area to volume ratio is large, there is a lot of surface area for diffusion and not much volume to travel within. This is the case for unicellular organisms, which can rely on diffusion alone to get the substances they need.

Detailed explanation-4: -In the unicellular organism, the cell is in close contact with the external environment. Hence, diffusion is the main more of transport in unicellular organisms. Diffusion is defined as the net movement of particle from a region of higher concentration to a lower concentration down the concentration gradient.

Detailed explanation-5: -“Diffusion is the process of movement of molecules from a region of higher concentration to a region of lower concentration.” Diffusion in Plants. Diffusion is a very important process for photosynthesis where carbon dioxide from the stomata diffuses into the leaves and finally into the cells.