Question

At which wavelength (colour of light), maximum photosynthesis in plants is observed?

• A. Blue and green
• B. Blue and red
• C. Red and yellow
• D. Red and green

Answer 1

The correct option is B Blue and red

Chlorophyll a is the primary pigment associated with photosynthesis and it is responsible for entrapping of the sunlight. It shows the highest excitation at the wavelengths of blue and red colour. Thus the maximum photosynthesis observed by plants is in the wavelength of blue and red colour. The other regions also show some amount of photosynthesis but the maximum is contributed by the blue and red regions.