1. Increasing atmospheric CO₂ concentration up to 0.05% can enhance CO₂ fixation rate 2. C₃ plants respond to higher temperatures with enhanced photosynthesis while C₄ plants have much lower temperature optimum 3. Tomato is a greenhouse crop which can be grown in CO₂ - enriched atmosphere for higher yield 4. Light saturation for CO₂ fixation occurs at 10% of full sunlight

Topic: Factors affecting photosynthesis· Plant Physiology

With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct ?

1. Increasing atmospheric \(CO_2\) concentration up to 0.05% can enhance \(CO_2\) fixation rate

2. \(C_3\) plants respond to higher temperatures with enhanced photosynthesis while \(C_4\) plants have much lower temperature optimum

3. Tomato is a greenhouse crop which can be grown in \(CO_2\) - enriched atmosphere for higher yield

4. Light saturation for \(CO_2\) fixation occurs at 10% of full sunlight

Doubtly Asked 30 Oct 2026 NEET UG 2017 Practice test neet Save WhatsApp Report

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Answer: 2. \(C_3\) plants respond to higher temperatures with enhanced photosynthesis while \(C_4\) plants have much lower temperature optimum

The wrong statement is option 2; it is reversed.

\(C_4\) plants respond to higher temperatures with enhanced photosynthesis (optimum about \(30\text{-}45^\circ C\)), while \(C_3\) plants have a lower temperature optimum.

The other statements are true: \(CO_2\) up to about 0.05% raises fixation, tomato is grown in \(CO_2\)-enriched greenhouses, and light saturates at about 10% of full sunlight.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct ?

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