Q. 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 up to 0.05% can enhance $CO_2$ fixation rate
C) $C_3$ plants respond 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
Explanation
[Solution] It is the reverse: $C_4$ plants have a higher temperature optimum than $C_3$ plants. Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.