Direction for: In each of the following questions a statement of Assertion is given followed by a corresponding statement of Reason just below it. Of the statements mark the correct answer as
Assertion: Under conditions of high light intensity and limited \[C{{O}_{2}}\] supply, photo-respiration has a useful role in protecting the plants from photo-oxidative damage. Reason: If enough \[C{{O}_{2}}\] is not available to utilize light energy for carboxylation to processed, the excess energy may not cause damage to plants.A) If both assertion and reason are true and the reason is the correct explanation of the assertion.
B) If both assertion and reason are true but the reason is not the correct explanation of the assertion.
C) If assertion is true statement but reason is false.
D) If both assertion and reason are false.
Correct Answer: C
Solution :
Photorespiration is a light induced oxidation of photosynthetic intermediate with the help of oxygen. For this RUBISCO enzyme functions as RuBp oxygenase and non ATP and NADPH formation takes place instead \[{{O}_{2}}\] is used and \[C{{O}_{2}}\] is released. Photorespiration is stimulated by (i) High \[{{O}_{2}}\] concentration. (ii) Low \[C{{O}_{2}}\] concentration. (iii) High light intensity. (iv) High temperature. Aging of leaf.
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