Question

Given graph represents the absorption spectra of three photosynthetic pigments, $chl a, chl b$ and $\beta$-carotene

Select the correct statement regarding this.

• A. The curve showing the amount of absorption of different wavelengths of light by a photosynthetic pigment is called as absorption spectrum.
• B. Chl a and chl b absorb maximum light in blue and red wavelengths of light.
• C. Rate of photosynthesis is maximum in blue and red wavelengths of light.
• D. All of these

Answer 1

Answer: (D)

The graphical curve showing the amount of energy of different wavelengths of light absorbed by a pigment is called absorption spectrum. It is studied with the help of spectrophotometer. The absorption spectra of chlorophylls a and b show that they absorb maximum light in the blue-violet and red wavelengths. The pigments are often known after the wavelength which is absorbed to the maximum, e.g., $Chl a_{673} Chl a_{683} (P_{680}), Chl a_{703} (P_{700})$.