Question

Photosynthesis is maximum in
A. Blue light
B. Red light
C. Green light
D. Both A and B

Answer 1

Hint: The plants need a light source which is mainly sun to perform the photosynthesis. The light is in the visible spectra from 400-700 nm of wavelength. This gives the best results. The light energy is only converted to chemical energy which is stored as an energy source.

Complete answer:
Photosynthesis is the process by which the plants make their food by using sunlight, water and carbon dioxide.
There are 2 photosystems in the photosynthesis process –light and dark reactions, occurring in the chlorophylls. They absorb light from the source. There is a linear relation between light used and carbon dioxide fixation.

> Option A - Blue light: The light under the 400-700 nm wavelengths does the active photosynthetic radiation which is best for the photosynthesis to occur. It is the best region of the absorption spectra.
> Option B - Red light: Red forms the second-best light region for the photosynthesis. But the combination of red and blue is the best for the photosynthesis.
> Option C - Green light: The photosynthesis is the minimum in this light as rather than being absorbed, the light gets reflected.

Hence, the correct answer is option (D).

Note: As the blue light is good but the red and blue light duo is the best for photosynthesis so we will choose both A and B over the blue light only. The light energy is being converted to the chemical energy in the process of photosynthesis. The by-products we get are oxygen and organic compounds. The best wavelength used is 570 nm.