Biology Multiple Choice Questions and Answers for Different Competitive Exams

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

Chloroplast: Photosynthetic apparatus

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


  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) 14CO2
  14. b)  Red light
  15. a) Black man

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