Read the following statements on photorespiration and state them as true (T) or false (F).
(A) Oxidation of RuBP in the stroma of the chloroplast in bright light and high oxygen.
(B) Does not utilize ATP and reducing power.
(C) Results in the release of CO₂ with the utilization of energy.
(D) The biological function of photorespiration is not yet well known.
A B C D
1. F T T F
2. F F T F
3. T F T F
4. T F T T

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answer is D.

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Detailed Solution

(A) True (T) - Photorespiration involves the oxidation of RuBP (Ribulose-1,5-bisphosphate) in the chloroplast stroma, and it occurs in conditions of low carbon dioxide and high oxygen and bright light.

(B) False (F) - Photorespiration does utilize ATP and reducing power. It consumes ATP and NADH, similar to the Calvin cycle, although it does not produce sugar.

(C) True (T) - Photorespiration results in the release of carbon dioxide (CO₂) and the consumption of energy in the form of ATP.

(D) True (T) - The biological function of photorespiration is not fully understood, but it is known to be a wasteful process that reduces the efficiency of photosynthesis, especially under certain environmental conditions such as high temperatures.

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