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NEET 2017
Exam
NEET
Year
2017
Subject
Botany
Chapter
Photosynthesis in Higher Plants

NEET 2017 · Botany · Photosynthesis in Higher Plants

With reference to factors affecting the rate of photosynthesis,...

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

Options

  1. ALight saturation for CO2C{O}_{2} fixation occurs at 10% of full sunlight
  2. BIncreasing atmospheric CO2C{O}_{2} concentration up to 0.05% can enhance CO2C{O}_{2} fixation rate
  3. CC3{C}_{3} plants respond to higher temperatures with enhanced photosynthesis, while C4{C}_{4} plants have a much lower temperature optimum
  4. DTomato is a greenhouse crop that can be grown in CO2C{O}_{2} - enriched atmosphere for a higher yield

Correct answer

C. C3{C}_{3} plants respond to higher temperatures with enhanced photosynthesis, while C4{C}_{4} plants have a much lower temperature optimum

Step-by-step solution

In C3{C}_{3} plants, photosynthesis is decreased at higher temperatures due to increased photorespiration. C4{C}_{4} Plants have a higher temperature optimum because of the presence of pyruvate phosphate dikinase enzyme, which is sensitive to low temperature.
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