Photosynthesis in Higher Plants

  1. For photosynthesis (i.e. for the synthesis of organic matter), the green plants need only .

(a) Light

(b) Chlorophyll

(c) CO2

(d) All of these

2. For synthesis of a molecule of glucose, the requirement of ATP and NADPH is respectively

(a) 15 and 10

(b) 33 and 22

(c) 12 and 8

(d) 18 and 12

3. Formation of ATP in photosynthesis and respiration is an oxidation process which utilizes the energy from

(a) Cytochromes

(b) Ferredoxin

(c) Electrons

(d) Carbon dioxide

4. Grana refer to

(a) Stacks of thylakoids in plastids of higher plants

(b) A constant in quantum equation

(c) Glycolysis of glucose

(d) By-product of photosynthesis

5. Greatest producers of organic matter are

(a) Crop plants

(b) Forests

(c) Plants of the land area

(d) Phytoplankton of oceans

6. Hill’s reaction takes place in

(a) Dark

(b) Light

(c) Dark and light both

(d) At any time

7. How many Calvin cycles form one hexose molecule

(a) 2

(b) 6

(c) 4

(d) 8

8. In a electron transport chain in terminal oxidation the cytochrome which donates electrons to O2 is

(a) Cytochrome b

(b) Cytochrome c

(c) Cytochrome a3

(d) Cytochrome a

9. In bacterial photosynthesis, the hydrogen donor is

(a) H2O

(b) H2SO4

(c) NH3

(d) H2S

10. In blue-green algae photosystem-II contain an important pigment concerned with photolysis of water it is called

(a) B earotene

(b) Chlorophyll’ b’

(c) Cytochrome ‘c’

(d) Phycocyanin

11. In C3 plants first stable product of photosynthesis during dark reactions is

(a) PGA

(b) PGAL

(c) RuBP

(d) Oxalo acetic acid

12. In C4 pathway or C4 photosynthesis carbobn dioxide fication occures in chloroplast of

(a) Palisade tissue

(b) Spongy mesophyll

(c) Bundle sheath

(d) Guard cells

13. In C4 plants, Calvin cycle operates in

(a) Stroma of bundle sheath chloroplasts

(b) Grana of Bundle sheath chloroplasts

(c) Grana of mesophyll chloroplasts

(d) Stroma od mesophyll chloraplasts

14. In C4 plants, initial carbondioxide fixation occurs on chloroplasts of

(a) Palisade tissue

(b) Spongy parnchyma

(c) Guard cells

(d) Hypodermis and chlorenchyma

15. In C4 plants, synthesis of sugars/ final CO2 fixation occurs in

(a) Palisade cells

(b) Spongy cells

(c) Undifferentiated mesophyll cells

(d) Bundle sheath cells

16. In case of C4 pathway

(a) CO2  combines with PGA

(b) CO2 combines with PEP

(c) CO2 first combines with RuBP

(d) CO2 combines with RMP

17. In chlorophyll ‘a’, third carbon of second pyroll ring is attached with

(a) Carboxyl group

(b) Magnesium

(c) Methyl group

(d) Aldehyde group

18. In normal chloroplast, the percentage of chlorophyll is

(a) 50%

(b) 75%

(c) 5-10%

(d) 95%

19. In photosynthesis, oxygen is liberated due to

(a) Reduction of carbon dioxide

(b) Hydrolysis os carbohydrate

(c) Photolysis of water

(d) Breakdown of chlorophyll

20. In pigment system II, active chlorophyll is

(a) P680

(b) P700

(c) P673

(d) P720

21. In which of the following the rate of photosynthesis is decreased and is known as red drop

(a) Blue light

(b) Green light

(c) Red light more than 680 nm

(d) Red light less than 680 nm

22. Intact chloroplast from green leaves cab be isolated by

(a) Acetone

(b) Ethanol

(c) Alcohol

(d) Sugar solution

23. Isotopes employed to study photosynthesis are

(a) 11C and 32P

(b) 15C and 32P

(c) 16C and 15O

(d) 14C and 18O

24. Isotopes popularly known to have been used in the study of photosynthesis are

(a) C14 and O18

(b) C11 and C32

(c) C16 and N15

(d) P32 and C15

25. Kranz anatomy is typical of

(a) C4 plants

(b) C3 plants

(c) C2 plants

(d) CAM plants

26. Light energy is conveted into chemical energy in the presence of

(a) Pyrenoids

(b) Chloroplasts

(c) Ribosomes

(d) Mesosomes

27. Light is necessary during photosynthesis for

(a) Evolution of hydrogen

(b) Photolysis of water

(c) Heating

(d) Breakdown of chlorophyll

28. Maize, sugarcane and some other tropical plants have high efficiency of CO2 fixation because they operate

(a) Calvin cycle

(b) Hatch – Slack cycle

(c) TCA cycle

(d) PP pathway

29. Make suitable pair

(A) Emerson effect – (a) C4 cycle

(B) Hill reaction – (b) Photolysis

(C)   Calvin’s cycle – (c)     C3 cycle

(D)   Hatch and Slack cycle – (d)     Photosystem-I & II

(a) Aa, Bb, Cc, Dd

(b) Aa, Bc, Cd Da

(c) Ac, Bd, Ca, Db

(d) Ad, Bb, Cc, Da

30. Most effective wavelength of light for photosynthesis is

(a) green

(b) Violet

(c) Red

(d) Yellow

31.NADP is reduced to NADPH in

(a) PSI

(b) PSII

(c) Calvin cycle

(d) Noncyclic photophosphorylation

32.Nine-tenth of all photosynthesis of world (85-90%) is carried out by

(a) Large trees with millions of branches and levess

(b) Algae of the ocean

(c) Chlorophyll containing ferns of the forest

(d) Scientist in the laboratories

33.Nobel prize was awarded to the scientist for discovering the pathway of carbon assimilation

(a) Watson

(b) Krebs

(c) Calvin

(d) Parnas

34.Number of calvin cycles required to generate a molecule of hexose is

(a) 2

(b) 4

(c) 6

(d) 8

35.One sixth part of the total PGAL produced is used for synthesis of

(a) Glucose

(b) RuBP

(c) RuMP

(d) DHAP

36.Oxidative phosphorylation occurs during the process of

(a) Protein synthesis

(b) N2 fixation

(c) Respiration

(d) Transpiration

37.Oxygen containing carotenoids are

(a) Carotenes

(b) Xanthophylls

(c) Phycobilins

(d) Anthocyanins

38.Oxygen liberated during photosynthesis comes from

(a) CO2

(b) Glucose

(c) H2O

(d) Fructose

39.P700 is a special from of which pigment

(a) Chlorophyll-b

(b) Carotenes

(c) Chlorophyll-a

(d) Phycobilins

40.Path of dark reaction of photosynthesis was traced through the use of

(a) 32P

(b) 14CO2

(c) 18O2

(d) X-rays

41.In the calvin cycle, the assimilatory power is used during

(A) Formation of PGA

(B) Conversion of  PGA to  PGAL

(C) Formation of fructose 1-6 diphsophate from PGAL

(D) Formation of glucose from fructose – di- phosphate

42.Unidirectional flow of e- in non-cyclic photophosphorylation is

(A) PS II — e- —> PS I — e- —> NADP — e- —> water

(B) Water — e- —> PSII — e- —> PS I — e- —> NADP

(C) PS I — e- —> NADP — e- —> water — e- —> PS II

(D) Water — e- —> PS I — e- —> PS II — e- —> NADP

43.Which is sensitive to longer wavelength of light?

(A) Photolysis

(B)  PSI


(D) Photophosphorylation

44.Phytol tail is present at

(A) 3rd carbon of IInd ring

(B) 2nd carbon of IIIrd ring

(C) 7th carbon of IVth ring

(D) 3rd carbon of IVth ring

45.Reduction of co-enzyme NADP depends on

(A) Reduction of CO2

(B) Evolution of O2

(C) Photolysis of water

(D) Formation of ATP

46. Loculus is the internal space of

(A) Grana

(B) Stroma

(C) Thylakoid

(D) Quantasome

47. Calvins cycle involves

(A) Oxidative phosphorylation

(B) Oxidative carboxylation

(C) Reductive carboxylation

(D) Reductive phophorylation

48. In C4 plants, carboxylation is twice, it can be represented as

(A) Pyruvic acid + CO2 malic acid + CO2

(B) RUDP + CO2 and pyruvic acid + CO2

(C) PEPA + CO2 and RUDP + CO2

(D) PEPA + CO2 and malic acid + CO2

49. In non-cyclic photophosphorylation, all the participants acts as electron donor and acceptor except

(A) Chl-a of PS I

(B) Chl-a of PS II


(D) Both (A) and (B)

50. Which of the following protist is a photoautotroph

(A) Thiobacillus

(B) Ferrobacillus

(C)  Diatoms

(D) Chlorobium

  1. Answer: (d)
  2. Answer: (d)
  3. Answer: (c)
  4. Answer: (a)
  5. Answer: (d)
  6. Answer: (b)
  7. Answer: (b)
  8. Answer: (c)
  9. Answer: (d)
  10. Answer: (d)
  11. Answer: (a)
  12. Answer: (b)
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  15. Answer: (d)
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  20. Answer: (a)
  21. Answer: (c)
  22. Answer: (a)
  23. Answer: (d)
  24. Answer: (a)
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  27. Answer: (b)
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  29. Answer: (d)
  30. Answer: (c)
  31. Answer: (d)
  32. Answer: (b)
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  50. Answer: (C)

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