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Question
With reference to factors affecting the rate of photosynthesis, which of the following statement is not correct?
With reference to factors affecting the rate of photosynthesis, which of the following statement is not correct?
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Solution
The correct option is B C3 plants respond to higher temperature with enhanced photosynthesis while C4 plants have much lower optimum temperature
Light saturation for carbon dioxide fixation occurs at 10% of full sunlight. This statement is true. Hence, light is rarely a limiting factor for photosynthesis unless the plants are in shade or in dense forest. However, increase in light intensity causes the breakdown of chlorophyll and decreases the rate of photosynthesis.
The major limiting factor for photosynthesis is carbon dioxide. Increasing atmospheric CO2 concentration up to 0.05% can enhance CO2 fixation rate. This statement is true. However, beyond this the levels can become damaging.
It has been observed that C3 plants respond to higher CO2 concentration and show increased rates of photosynthesis leading to higher productivity. This has been used to grow certain greenhouse crops such as tomatoes and bell pepper. These plants are allowed to grow in a carbon dioxide enriched atmosphere that leads to higher yields. Hence, the statement in option d is correct.
In C3 plants, photosynthesis decreases with increase in temperature due to increase in photorespiration. C4 plants tolerate higher temperatures and show a response to high light intensities. They lack a process called photorespiration and have greater productivity at high optimum temperature.
Hence, C4 plants respond to higher temperatures with enhanced photosynthesis while C3 plants have much lower temperature optimum.
Hence, statement in option c is incorrect.
Light saturation for carbon dioxide fixation occurs at 10% of full sunlight. This statement is true. Hence, light is rarely a limiting factor for photosynthesis unless the plants are in shade or in dense forest. However, increase in light intensity causes the breakdown of chlorophyll and decreases the rate of photosynthesis.
The major limiting factor for photosynthesis is carbon dioxide. Increasing atmospheric CO2 concentration up to 0.05% can enhance CO2 fixation rate. This statement is true. However, beyond this the levels can become damaging.
It has been observed that C3 plants respond to higher CO2 concentration and show increased rates of photosynthesis leading to higher productivity. This has been used to grow certain greenhouse crops such as tomatoes and bell pepper. These plants are allowed to grow in a carbon dioxide enriched atmosphere that leads to higher yields. Hence, the statement in option d is correct.
In C3 plants, photosynthesis decreases with increase in temperature due to increase in photorespiration. C4 plants tolerate higher temperatures and show a response to high light intensities. They lack a process called photorespiration and have greater productivity at high optimum temperature.
Hence, C4 plants respond to higher temperatures with enhanced photosynthesis while C3 plants have much lower temperature optimum.
Hence, statement in option c is incorrect.
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