Question

Two types of photosynthetic pigments are
A. Chlorophyll a and carotenoids
B. Chlorophyll b and carotenoids
C. Chlorophylls and carotenoids
D. Chlorophyll a and Chlorophyll b

Answer 1

Hint: The pigment present in the chloroplasts of photosynthetic bacteria which are capable of capturing light energy for photosynthesis is called photosynthetic pigment.

Complete Answer:
Plants have different types of pigments like carotenoids, anthocyanins, flavonoids, betalain, and chlorophyll. These pigments have different functions. Out of these carotenoids and chlorophyll are the photosynthetic pigments.

- Chlorophyll: it is of three types a, b, c. Chlorophyll a and chlorophyll b are the main photosynthetic pigments. It is the green pigment. Chlorophyll a is the most common pigment present in every plant to carry out photosynthesis. Chlorophyll a and b absorb the wavelength of light in the electromagnetic wavelength of blue and red.
- Carotenoids: it is the pigment found in plants, algae and other photosynthetic bacteria. It can produce bright yellow, red and orange colour in vegetables, plants and fruits. The characteristic colour of carrot, pumpkins, shrimps, tomatoes are due to carotenoid. It acts as an antioxidant. Carotenoids are stored in the fatty tissues of animals. Carotenoids can absorb wavelengths of 400-550nm i.e. violet to green light.

Thus the correct answer is C. Two types of photosynthetic pigments are Chlorophylls and carotenoids.

Note: The photosynthetic pigments absorb the electromagnetic radiations. These radiations generate photons which are absorbed in the reaction centres and convert the light energy of the sun to chemical energy.