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Blackman's law of LIMITING FACTORS states that the overall rate of photosynthesis is determined by:
AThe factor in shortest supply (most limiting)
BLight intensity always being the only limit
CThe factor in greatest supply
DAn average of all input factors equally
Answer & Solution
Correct answer: A. The factor in shortest supply (most limiting)
Blackman (1905): when multiple factors influence a process, the rate is controlled by the one in SHORTEST SUPPLY (most limiting). Increasing it improves rate until another factor becomes limiting. Used in greenhouse optimisation.
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