Factors affecting photosynthesis

2017 1 question

1. 1 Photosynthesis in Higher Plants Hard
   With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct?
   A Light saturation for $CO_2$ fixation occurs at 10% of full sunlight B Increasing atmospheric $CO_2$ concentration upto 0.05% can enhance $CO_2$ fixation rate C $C_3$ plants responds to higher temperatures with enhanced photosynthesis while $C_4$ plants have much lower temperature optimum D Tomato is a greenhouse crop which can be grown in $CO_2$ - enriched atmosphere for higher yield
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