During photosynthesis, the ratio of starch production to sucrose production is d

Question

During photosynthesis, the ratio of starch production to sucrose production is determined by

The rate of malate diffusion between mesophyll and bundle sheath cells

Triose-P / Pi antiport across the chloroplast inner membrane

The rate of sucrose photorespiration in the mitochondria

NADPH and ATP production during the light reactions

The amount of malate accumulated in the vacuole

The rate of malate diffusion between mesophyll and bundle sheath cells

Triose-P / Pi antiport across the chloroplast inner membrane

The rate of sucrose photorespiration in the mitochondria

NADPH and ATP production during the light reactions

The amount of malate accumulated in the vacuole

Explanation / Answer

During photosynthesis light reactions take place in grana of chloroplast and dark reactions take place in stroma of chloroplast. Three molcules of CO2 are fixed into one triose phosphate and 9 ATP, 6 NADPH are provided by the light-dependent reactions of photosynthesis. An antiporter in the inner chloroplast membrane exchanges Pi in the cytosol for 3-phosphoglycerate or dihydroxyacetone phosphate produced by CO2 assimilation in the stroma. Therefore, the ratio of starch production to sucrose production is determined by Triose-P / Pi antiport across the chloroplast inner membrane. Option 2 is correct.

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