Photosynthesis Question 56

56. A process that makes important difference between $C_3$ and $C_4$ plants is :

[2012]

(a) Transpiration

(b) Glycolysis

(c) Photosynthesis

(d) Photorespiration

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Answer : d

Hints & Solution

(d) Photorespiration is absent is $C_4$ plants. Photorespiration does not produce energy or reducing power. Rather, it consumes energy. Further, it undoes the work of photosynthesis. There is 25% loss of fixed $CO_2$. Therefore, photorespiration is a highly wasteful process. This happens only in case of $C_3$ plants.



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