Sample Questions — Factors affecting photosynthesis
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MCQ
Who proposed the Law of Limiting Factors?
✅ Correct Answer: C
F.F. Blackman introduced this principle in 1905.
MCQ
Which internal factor does not directly affect the photosynthetic rate?
✅ Correct Answer: C
While important for overall cell function, nuclear size isn’t a direct photosynthetic variable.
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MCQ
CO₂ is a major limiting factor in photosynthesis in:
✅ Correct Answer: D
In closed environments, CO₂ levels may be too low to support optimal photosynthesis.
MCQ
Which of the following is a law that describes the effect of multiple factors on photosynthesis?
✅ Correct Answer: A
Blackman’s Law of Limiting Factors explains that when multiple factors affect a process, the one in minimal supply limits the rate.
MCQ
According to Blackman’s law, when a process is influenced by several factors, the rate is limited by:
✅ Correct Answer: A
The scarcest factor among those required becomes limiting.
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