Discuss the electromagnetic spectrum and the absorption spectrum of chlorophyll. Why chlorophyll is a green pigment?

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Solution

The electromagnetic spectrum, the entire distribution of electromagnetic radiation according to frequency or wavelength. Radio waves, infrared rays, visible light, ultraviolet rays, X-rays, and gamma rays are all types of electromagnetic radiation. An absorption spectrum shows all the light typically absorbed by a leaf. An action spectrum, meanwhile, shows all the light that is actually used for photosynthesis. Chlorophyll is a green pigment that gives most plants their colour. The reason that it is green is that in the absorption spectra, chlorophyll absorbs light in the red (long wavelength) and the blue (short wavelength) regions of the visible light spectrum. The green light is not absorbed but reflected, making the plant appear green.

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Similar questions

Q. The absorption spectrum of chlorophyll

Q. The red and green lines in the graph shown below indicate the action spectra for chlorophyll pigment molecules during photosynthesis. The black line in the graph below shows the absorption spectrum for green plants.
Which of the following best explains the difference between the action spectra and the absorption spectrum in photosynthetic tissues?

Q. Maximum absorption of light by chlorophyll a occurs in which regions of the absorption spectrum (a) Blue (b) Red (c) Green (d) Yellow

Q. Is there a complete one-to-one overlap between the absorption spectrum of chlorophyll a and the action spectrum of photosynthesis?

Question 53
In the figure given below, the black line (upper) indicates action spectrum for photosynthesis and the lighter line (lower) indicates the absorption spectrum of chlorophyll-a, answer the following

(a) What does the action spectrum indicate? How can we plot an action spectrum? Explain with an example.

(b) How can we derive an absorption spectrum for any substance?

(c) If chlorophyll-a is responsible for light reaction of photosynthesis, why do the action spectrum and absorption spectrum not overlap?

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