Question:

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

Updated On: Jun 23, 2024

Increasing atmospheric $CO_2$ concentration up to $0.05\%$ can enhance $CO_2$ fixation rate
$C_3$ plants respond to higher temperatures with enhanced photosynthesis while $C_4$ plants have much lower temperature optimum
Tomato is a greenhouse crop which can be grown in $CO_2 -$ enriched atmosphere for higher yield
Light saturation for $CO_2$fixation occurs at $10\%$ of full sunlight

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The Correct Option is B

Solution and Explanation

In $C _{3}$ plants photosynthesis is decreased at higher temperature due to increased photorespiration.
$C _{4}$ plants have higher temperature optimum because of the presence of pyruvate phosphate dikinase enzyme, which is sensitive to low temperature.

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Concepts Used:

Photosynthesis in Higher Plants

Processes Of Photosynthesis in Higher Plants:

Photosynthesis in higher plants involves the following processes:

Light Reaction
Dark Reaction

Light Reaction:

This phenomenon occurs in the presence of light.
The pigment absorbs light and produces energy in the form of ATP.
The process involves- absorption of light, water splitting, the release of oxygen, and formation of ATP and NADPH.

Dark Reaction:

This process occurs in the absence of light in the stroma of the chloroplasts. The following cycles are involved in the process:

Calvin Cycle (C3 Cycle)
C4 Cycle (Hatch and Slack Pathway)