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Blackman's Law of Limiting Factors states that
AThe factor in least supply limits the rate
BAll factors equally limit the process
COnly light limits photosynthesis ever
DOnly CO2 limits photosynthesis ever
Answer & Solution
Correct answer: A. The factor in least supply limits the rate
Blackman (1905): in a multi-factor process, the rate is set by the factor nearest its minimum value. In photosynthesis, light may saturate at 10%, then CO2 or temperature takes over as the limiting factor.
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