Which pigment acts directly to convert light energy to chemical energy?

1. Chlorophyll a.

2. Chlorophyll b.

3. Xanthophyll.

4. Carotenoid.

Which regions of the visible spectrum are responsible for most of the photosynthesis?
a. blue and yellow
b. blue and red
c. blue and green
d. green and red

How many pigments are responsible for the color of a plant leaf?
1. 1
2. 2
3. 3
4. 4

Absorption spectrum of chlorophyll- ‘a’ is shown by-


a. i
b. ii
c. iii
d. Not shown.

In the given graph what does A, B represent?

In the given diagram, X, Y, and Z respectively represent the absorption spectrum of:

1. Chlorophyll a, Chlorophyll b, and Carotenoids

2. Chlorophyll b, Chlorophyll a, and Carotenoids

3. Chlorophyll b, Carotenoids, and Chlorophyll a

4. Chlorophyll a, Carotenoids, and Chlorophyll b

Consider the following statements:

Which of the above statements are true?

Photosynthetically active radiation (PAR) represents the following range of wavelengths:
1. 450-950 nm
2. 340-450 nm
3. 400-700 nm
4. 500-600 nm