Chloroplast Alignment & Light Intensity — NEET Biology
📚 Practice ConceptYou would recollect from previous unit that the mesophyll cells in the leaves, have a large number of chloroplasts. Usually the chloroplasts align themselves along the walls of the mesophyll cells, such that they get the optimum quantity of the incident light. When do you think the chloroplasts will be aligned with their flat surfaces parallel to the walls? When would they be perpendicular to the incident light?
Which of the following statements regarding mesophyll cells and photosynthesis are NOT correct? S1: Mesophyll cells in C3 plants contain a large number of chloroplasts, optimally positioned to maximize light absorption. S2: The initial carboxylation of CO2 in C4 plants occurs in mesophyll cells, where RuBisCO enzyme is highly concentrated. S3: Light reactions, including the splitting of water, take place predominantly in the stroma of chloroplasts in mesophyll cells. S4: The biosynthetic phase of photosynthesis, which does not directly depend on light, is carried out in the mesophyll cytoplasm. S5: In C4 plants, the mesophyll cells transport 4-carbon acids to the bundle sheath cells for the release of CO2.
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