With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct?
Answer: (C) C3 plants responds to higher temperatures with enhanced photosynthesis while C4 plants have much lower temperature optimum. The question asks for the incorrect statement.
- A.Light saturation for CO2 fixation occurs at 10% of full sunlight
- B.Increasing atmospheric CO2 concentration upto 0.05% can enhance CO2 fixation rate
- C.C3 plants responds to higher temperatures with enhanced photosynthesis while C4 plants have much lower temperature optimum✓
- D.Tomato is a greenhouse crop which can be grown in CO2 - enriched atmosphere for higher yield
Correct Answer
(C) C3 plants responds to higher temperatures with enhanced photosynthesis while C4 plants have much lower temperature optimum
Solution & Explanation
The question asks for the incorrect statement. NCERT states C4 plants respond to higher temperatures with a higher rate of photosynthesis while C3 plants have a much lower temperature optimum — the exact reverse of option C, which therefore is the wrong (and hence the answer) statement. Options A (light saturation at 10% of full sunlight), B (CO2 enhancement up to ~0.05%) and D (CO2-enriched greenhouse crops like tomato) are all stated correctly in NCERT. NCERT: Class 11 Ch 11, p.150 [150:026–150:028]: "The C4 plants respond to higher temperatures and"