NEET BIOLOGY

Detailed explanation-1: -CO2 must also diffuse from substomatal cavities throughout the mesophyll, dissolve in wet cell walls, enter the cytosol across a plasmalemma, diffuse into chloroplasts across a double membrane (outer envelope in Figure 1.7) and finally reach fixation sites within the stroma of those chloroplasts.

Detailed explanation-2: -Plants require carbon dioxide to perform photosynthesis. Carbon dioxide enters the leaf cells through small holes present on the lower side of the leaf called stomata and then reaches the cell’s chloroplast. CO2 moves across the cell membrane through the process of simple diffusion.

Detailed explanation-3: -Plants get carbon dioxide from the air through their leaves. The carbon dioxide diffuses through small holes in the underside of the leaf called stomata. This allow the oxygen produced in photosynthesis to leave the leaf easily.

Detailed explanation-4: -Leaf anatomy varies between species and with growth irradiance. The paths for CO2 diffusion through intercellular airspaces from substomatal cavities to cell walls adjacent to chloroplasts depend on mesophyll thickness, porosity, and location of stomata.