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Emerson's Effect

Photosynthesi...

Question

Photosynthesis is least in which wavelength of light?

A

450 nm

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B

550 nm

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C

650 nm

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D

700 nm

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Solution

The correct option is A 550 nm
Two main photosynthetic pigment chlorophyll a and chlorophyll b absorb light in violet blue (400 -500 nm) and red (620-700nm) region of visible spectrum. Neither of these pigments absorbs light between 500 to 600 nm (green light) causing least photosynthesis in this wavelegnth. Thus, the correct answer is option B.

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Similar questions

Q. Wavelength of light least effective in photosynthesis is

Q. A beam of light having wavelengths distributed uniformly between 450 nm to 550 nm passes through a sample of hydrogen gas. Which wavelength will have the least intensity in the transmitted beam?

Study the following statements.
(i) Red light falling in the range of wavelength 660-760 nm is the most effective for photosynthesis.
(ii) Green light falling in the range of wavelength 500-580 nm is the least effective for photosynthesis.
(iii) Chl a, chl b, carotenes and xanthophylls are soluble in organic solvents.
(iv) Phycobilins (phycocyanin, allophycocyanin and phycoerythrin) are soluble in water.
Which of the above statement is/are incorrect?

Q. During photosynthesis, chlorophyll absorbs light of wavelength

440 nm

and emits light of wavelength

670 nm

. What is the energy (in kJ/mol) available for photosynthesis from the absorption-emission of a mole of photons?

Q. During photosynthesis, chlorophyll absorbs light of wavelength

440 n m

and emits light of wavelength

670 n m

. What is the energy available for photosynthesis from the absorption-emission of a mole of photons?

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