Same chapter3 marksDifficulty: Medium
What is photorespiration and why is it regarded as wasteful?
Photosynthesis and Respiration in Plants
3 marksDifficulty: Medium
Describe cyclic and non-cyclic photophosphorylation.
Original Khojo Papers practice question — not from a past board paper.
Answer
In non-cyclic photophosphorylation the electron passes from photosystem II through the electron transport chain to photosystem I and finally to NADP, so ATP and NADPH are both produced and water is split, releasing oxygen. In cyclic photophosphorylation only photosystem I is involved, the electron returns to it and only ATP is produced, with no NADPH and no oxygen.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
Cyclic flow takes over when the plant needs more ATP than NADPH.
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