Photosynthetic Pigments

1. Which of the following is a chlorophyll molecule lacking central Mg2+ ion?

a) chl a

b) bacteriochlorophyll

c) chl c

d) pheophytin

2. The primary pigment in photosynthesis is

a) chl a

b) chl b

c) chl a and chl b

d) chl a, chl b and carotenoids

3. The pigments that gives brown colour to kelps or brown algae is

a) chl c

b) pheophytin

c) fucoxanthin

d) phycocyanin

4. Phycobilins (phycoerythrin and phycocyanin) are accessory pigments found in

a) green plants

b) blue green algae and red algae

c) blue green algae and diatoms

d) red algae and brown algae

5. Which of the following pigments are present in all photosynthetic plants?

a) chl a

b) chl a and b

c) chl a and carotenoids

d) chl a, b and carotenoids

6. Instead of –CH3 group at the third C of the side group of Chl a, Chl b has

a) –COOH group

b) –CO group

c) –CHO group

d) –OH group

7. The photosynthetic activity of chlorophyll is maximum in

a) violet and red light

b) violet light

c) blue light

d) red light

8. Xanthophylls differ from carotenes (C40H56) in having

a) Mg

b) Cl

c) O2

d) H

9. Which of the following is a water soluble pigment?

a) chl a

b) chl b

c) carotenoids

d) phycobilins

10. The photosynthetic pigments are located in

a) chloroplast

b) grana

c) stroma

d) Thylakoid

1. d) pheophytin6. c) –CHO group
2. a) chl a7. d) red light
3. c) fucoxanthin8. c) O2, (Carotenes: C40H56; Xanthophyll: C40H56O2)
4 . b) blue green algae and red algae9. d) phycobilins
5. c) chl a and carotenoids10. d) Thylakoid