Question

Chlorophyll a and b shows maximum absorption in
a) Blue region
b) Red region
c) Blue and red region
d) Yellow and violet region

Answer 1

Hint: Light energy initiates the process of photosynthesis when pigments like chlorophyll and carotenoids absorb the light and reflect at a certain region of electromagnetic spectrum. These pigment molecules absorb only visible light and the light energy is converted into chemical energy in the case of photosynthesis.

Complete answer:
There are different kinds of pigments available which absorbs only certain wavelengths or colors of visible light. In the process of photosynthesis, pigment molecules absorb more energy from sunlight. The two major classes of photosynthetic pigments which are found in plants and algae are Chlorophylls and carotenoids.
Chlorophyll a is a specific pattern of chlorophyll which helps in the process of oxygenic photosynthesis by absorbing most energy. It is the most common and abundant photosynthetic pigment which absorbs wavelengths from violet-blue and orange-red light of the visible spectrum.
Chlorophyll b is a specific form of chlorophyll which is used in photosynthesis to absorb more amount of light energy. Because of its carbonyl group, it is highly soluble than chlorophyll and in polar solvents. It primarily absorbs blue and red-orange light from visible light.
Thus, the right option is C.

Note: Conversion of light energy into chemical energy is the overall purpose of the light-dependent reactions. This chemical energy will be utilized by the reaction of the Calvin cycle in order to act as a fuel in assembling the sugar molecules. Red has the longest wavelengths and carries only a minimal amount of energy whereas, Violet and blue have the shortest wavelengths and transfer the large amount of energy.