Question

Compare C3 and C4 plants on the basis of C02 acceptor, cell type and first CO2 fixation products.​

Answer 1

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In C3 plants, the carbon dioxide fixation takes place only at one place. In C4 plants, the carbon dioxide fixation takes places twice (one in mesophyll cells, second in bundle sheath cells). C3 plants possess only one CO2 acceptor. C4 plants possess two CO2 acceptors (primary acceptor and secondary acceptor).

Answer 2

C3 and C4 plants are two types of photosynthetic plants that differ in their carbon fixation processes.

C3 plants use a C3 carbon fixation pathway where the primary CO2 acceptor is the 3-carbon molecule, phosphoglyceric acid (PGA). The CO2 is initially fixed by the enzyme Rubisco in the mesophyll cells of the leaves, which then enters the Calvin cycle to produce glucose.
C3 plants are efficient in cool and wet environments but are less efficient in hot and dry conditions due to high rates of photorespiration.

Therefore, the main differences between C3 and C4 plants are their CO2 acceptor, cell type, and first CO2 fixation product.
C3 plants use PGA, mesophyll cells, and produce three-carbon products, while C4 plants use oxaloacetate, mesophyll, and bundle sheath cells, and produce four-carbon products.

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