What is the basis for designating C3 and C4 pathways of photosynthesis?

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Answer -

In the C3 pathway, carbon is fixed into 3-PGA, which is a 3- carbon compound. However, in the C4 pathway, carbon is fixed into oxaloacetic acid, which is a 4-carbon compound. Hence, the C3 and C4 pathways are designated on the basis of the carbon compound number in the end product.

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