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The first action spectrum of photosynthesis was described by

(a) Blackman Your answer
(b) Engelmann Correct
(c) van Niel Your answer
(d) Priestley Your answer

Your answer: Correct answer: (b)

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Explanation

Why (b) is correct

T.W. Engelmann (1882) described the first action spectrum of photosynthesis using Cladophora and aerobic bacteria in light split by a prism.

Why the other options are wrong

(a) · your answer Blackman gave the law of limiting factors.
(c) · your answer Van Niel showed that O₂ comes from water (from studies of purple and green bacteria).
(d) · your answer Priestley showed that plants restore air (bell-jar experiment).

NCERT point: The action spectrum resembles roughly the absorption spectra of chlorophyll a and b: peaks in the blue and red regions.

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