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For plants growing in open fields in nature, which factor is rarely limiting for photosynthesis?
Your answer:
Correct answer: (a)
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Explanation
Why (a) is correct
NCERT says light is rarely a limiting factor in nature, except for plants in shade or under dense forests, since light saturation is reached at about 10% of full sunlight.
Why the other options are wrong
- (b) · your answer CO2 (0.03-0.04%) is often the main limiting factor.
- (c) · your answer Water stress often limits photosynthesis by closing stomata.
- (d) · your answer Low temperature in winter limits enzyme activity.
NCERT point: CO2 is the major limiting factor for photosynthesis.
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