MCQ on Plant Physiology - Photosynthesis

1.  Photosynthetic pigments are located in

a) stroma

b) grana

c) cytoplasm

d) thylakoids

2. The Dark reaction of photosynthesis was worked out by:

a) Hatch and Slack

b) Melvin Clavin

c) Arnold

d) Emerson

3. During photosynthesis oxygen is evolved from

a) carbohydrates

b) proteins

c) sunlight

d) water

4. Light reaction occur in

a) Grana

b) stroma

c) thylakods

d) mitochondria

5. Photosynthetic pigments absorb

a) UV radiation

b) IR radiation

c) Visible radiation

d) Gama radiation

6.  In cyclic photophorylation the high energy electrons are driven out from

a) Chlorophyll a 683

b) P 700

c) Chlorophyll a 673

d) P 870

7. One among the following elements is very important for photolysis of water

a) Mg

b) Mn

c) Fe

d) Zn

8. The hypothesis that all photosynthesis organisms require a source of hydrogen was first proposed by

a) Van Niel

b) Hatch and Slack

c) Hill

d) Ruber and Kamen

9. In the photosynthesis process, PS II absorbs energy at or just below

a) 700 nm

b) 870 nm

c) 680 nm

d) 780 nm

10. The amount of ATP required for the synthesis of one glucose molecule in C4 pathway is

a) 18 ATP

b) 30 ATP

c) 12 ATP

d) 24 ATP

11.  In bacterial photosynthesis comes from

a) H₂S

b) H₂O

c) H₂SO₄

d) NH₃

12.  Isotopes popularly known to have been used in study of photosynthesis:

a) C¹⁶ and N¹⁵

b) C¹⁴ and O¹⁶

c) P³² and C¹²

d) C¹¹ and P³²

13. Dark reaction is traced by

a) O¹⁹

b) P³²

c) X-rays

d) 14CO₂

14. Photosynthesis is maximum in

a) Blue light

b)  Red light

c)  Blue and green light

d) Blue and red light

15. Law of limiting factor was proposed by

a) Black man

b) Hill

c) Arnold

d) Engle man

Answers:

1. d) thylakoids
2. b) Melvin Clavin
3. d) water
4. a) Grana
5. c) Visible radiation
6. b) P 700
7. a) Mg
8. a) Van Niel
9. c) 680 nm
10. b) 30 ATP
11. a) H₂S
12. b) C¹⁴ and O¹⁶
13. ^{d) 14CO}₂
14. _{b)  Red light}
15. _{a) Black man}