Back to your test review

An action spectrum of photosynthesis is a graph of

(a) rate of photosynthesis against CO₂ concentration Your answer
(b) rate of photosynthesis against temperature Your answer
(c) rate of photosynthesis against wavelength of light Correct
(d) light absorbed by chlorophyll a against wavelength Your answer

Your answer: Correct answer: (c)

Advertisement

Explanation

Why (c) is correct

An action spectrum plots the rate of photosynthesis against the wavelength of light. It shows which wavelengths are most effective.

Why the other options are wrong

(a) · your answer Rate against CO₂ concentration is a limiting-factor curve, not an action spectrum.
(b) · your answer Rate against temperature is not an action spectrum.
(d) · your answer Light absorbed by a pigment against wavelength is an absorption spectrum.

NCERT point: Engelmann gave the first action spectrum of photosynthesis.

Thank you! We will check this question.

Practise Photosynthesis in Higher Plants

Take a free 15-question NEET Biology test on this chapter. Timed, scored instantly.

Start free test

Similar questions

When the absorption spectrum of chlorophyll a is superimposed on the action spectrum of photosynthesis, they Which pigment is NOT a part of the light harvesting complex of thylakoids? Which statement about chlorophyll a is correct?