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Give comparison between the following:(a) C3 and C4 pathways(b) Cyclic and non-cyclic photophosphorylation(c) Anatomy of leaf in C3 and C4 plants |
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Answer» (a) The first carbon fixation product is PGA (3-carbon atom) in C3 pathway, while it is oxaloacetic acid (4-carbon atom) in C4 pathway. The C4 pathway is more efficient than the C3 pathway; in terms of making glucose. (b) Both the photosystems are involved in non-cyclic photophosphorylation, while only PS I is functional in cyclic photophosphorylation. Non-cyclic photophosphorylation happens in the lamella of grana, while cyclic photophosphorylation occurs in the lamella of stroma. Both ATP and NADPH+H+ are synthesized in non-cyclic photophosphorylation, while only ATP is synthesized in cyclic photophosphorylation. (c) Bundle sheath is present in C4 leaves, while it is absent in C3 leaves. The cells of C4 leaves have a large number of chloroplasts, thick walls and no intercellular spaces. |
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