The region of cell diffusion in a root is

Explanation

The question is asking about the region of cell diffusion in a root. Diffusion is the movement of molecules from an area of high concentration to an area of low concentration. In this case, it refers to the movement of molecules or substances across a cell membrane in the root. The four options given are root cap, endodermis, xylem, and meristem. The correct answer is option D, which is meristem. Meristem is the region of the root where cell division takes place. This region is responsible for the growth of the root. During cell division, substances are diffused across the cell membrane to ensure that the new cells receive the necessary nutrients for growth. The other options, root cap, endodermis, and xylem, are not regions where cell diffusion takes place. Root cap is the protective layer at the tip of the root that helps it penetrate the soil. Endodermis is the innermost layer of cells in the root cortex that regulates the flow of water and nutrients into the xylem. Xylem is a tissue in plants that transports water and nutrients from the roots to the leaves. In summary, the region of cell diffusion in a root is the meristem, which is responsible for cell division and growth in the root. The other options, root cap, endodermis, and xylem, are not regions where cell diffusion takes place.