Find the incorrect statement(s) about photosynthesis from the following : A. The water splitting complex is associated with PS I. B. C _4 plants use the C _3 pathway of CO _2 fixation as the main biosynthetic pathway. C. In C _4 plants, photorespiration does not occur. D. C _3 plants exhibit 'Kranz' anatomy. E. ATP synthesis in chloroplast occurs through chemiosmosis. Choose the answer from the options given below :
D. A and D only
Statement A is incorrect because the water splitting complex is associated with PS II, not PS I. Statement B is correct because the Calvin cycle ( C _3 pathway) is the main biosynthetic pathway for all plants, including C _4 plants. Statement C is correct because C _4 plants have a mechanism that increases the concentration of CO _2 at the enzyme site, preventing RuBisCO from acting as an oxygenase, thus avoiding photorespiration. Statement D is incorrect because Kranz anatomy is a characteristic feature of C _4 plants, not C _3 plants. Statement E is correct because ATP synthesis in chloroplasts is explained by the chemiosmotic hypothesis. Therefore, the incorrect statements are A and D. Answer: A and D only
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