Question

The maximum light absorbed by the chlorophyll a is at the wave length of

• A. 460 nm
• B. 500 nm
• C. 600 nm
• D. 660 nm

Answer 1

The correct option is A 460 nm

Small part of visible light in the range of 400 to 700 nm is active in photosynthesis. It is called as photosynthetically active region or PAR. The chlorophyll absorbs maximum in the blue region and red region. The blue region of PAR is near 400 nm after violet and indigo light, while the red region is near 700 nm. The blue region is centered around 460 nm, where chlorophyll a shows maximum absorption.