Photosynthesis (Multiple Choice Questions and Answers)


Multiple Choice Questions and Answers

1. Photorespiration is a phenomenon that occurs in the cycle

(a) Pyruvate

(b) Glycolate

(c) Hill

(d) Krebs

Answer: (b) Glycolate

2. The energy wastage occurs during

(a) dark reaction

(b) photorespiration

(c) photosynthesis

(d) none of the above

Answer: (b) photorespiration

3. Oxygen liberated during photosynthesis comes from

(a) carbondioxide

(b) water

(c) phosphoglyceric acid

(d) chlorophyll

Answer: (b) water

4. The first step in photosynthesis is

(a) joining of three carbon atoms to form glucose

(b) formation of ATP

(c) ionization of water

(d) excitement of an electron of chlorophyll a by a photon of light

Answer: (d) excitement of an electron of chlorophyll a by a photon of light

 5. Dark reaction in photosynthesis is called so because

(a) it can also occur in dark

(b) it does not require light energy

(c) neither of these

(d) both of these

Answer: (b) it does not require light energy

 6. During photosynthesis oxygen in a glucose comes from

(a) water

(b) carbon dioxide

(c) both water and carbon dioxide

(d) from air

Answer: (b) carbon dioxide

 7. Haeme is constituent of one type of electron transport substance

(a) hemoglobin

(b) phytochrome

(c) cytochrome

(d) NADP

Answer: (c) cytochrome

 8. All photosynthetic green plants contain

(a) chlorophyll a

(b) chlorophyll b

(c) chlorophyll c

(d) chlorophyll d

Answer: (a) chlorophyll a

 9. First stable product of carbon assimilation is

(a) phosphoglycerate

(b) glucose

(c) starch

(d) pyruvic acid

Answer: (a) phosphoglycerate

 10. Kranz anatomy is found in

(a) C4 plants

(b) C3 plants

(c) succulents

(d) none of the above

Answer: (a) C4 plants

 11. Chlorophyll a is characterized by the side group of

(a) methyl

(b) aldehyde

(c) phytol

(d) keto

Answer: (a) methyl

12. Ferredoxin is a component of

(a) P680

(b) Hill reaction

(c) photosystem II

(d) photosystem 1

Answer: (d) photosystem 1

13. Photorespiration is favoured by

(a) low light intensity

(b) low oxygen and high carbon dioxide

(c) low temperatures

(d) high oxygen and low carbon dioxide

Answer: (d) high oxygen and low carbon dioxide

14. In C4 plants initial acceptor of carbon dioxide is

(a) ribulose 5 phosphate

(b) phosphoenolpyruvic acid

(c) ribulose 1-4 diphosphate

(d) 3PGA

Answer: (b) phosphoenolpyruvic acid

15. For each molecule of glucose formed in plants, the number of molecules of ATP and NADPH2 required are respectively

(a) 15 and 10

(b) 12 and 18

(c) 18 and 12

(d) 33 and 22

Answer: (c) 18 and 12

16. Of the following photosynthesizing organisms chlorophyll a is absent in

(a) bacteria

(b) flowering plants

(c) herbs

(d) algae

Answer: (a) bacteria

17. The percentage of light energy fixed in photosynthesis is generally around

(a) 35%

(b) 10%

(c) 50%

(d) 1%

Answer: (d) 1%

18. The inner envelope of chloroplast is permeable to

(a) triose phosphate

(b) orthophosphate

(c) sucrose

(d) glutamine

Answer: (b) orthophosphate

19. Which of the following photosynthetic bacteria have both PSI and PSII?

(a) green sulphur bacteria

(b) purple sulphur bacteria

(c) purple non sulphur bacteria

(d) cyanobacteria

Answer: (d) cyanobacteria

20. Ribulose diphosphate carboxylase oxygenase is located in

(a) mitochondria

(b) chloroplast

(c) peroxisomes

(d) golgi bodies

Answer: (b) chloroplast

21. There are two light reactions in photosynthesis. The one sensitive to longer wavelength of light is known as

(a) photosystem I

(b) photosystem II

(c) photophosphorylation

(d) photolysis

Answer: (a) photosystem I

22. Photorespiration is characteristic of

(a) C3 plants

(b) C4 plants

(c) CAM plants

(d) none of the above

Answer: (b) C4 plants

23. First stable product of dark reaction in C3 plants is

(a) PGA

(b) RuBP

(c) PEP

(d) OAA

Answer: (a) PGA

24. Photosynthesis is a process in which

(a) carbon dioxide is reduced to carbohydrate

(b) NADH is reduced to NAD

(c) ATP is generated

(d) oxidative phosphorylation occurs

Answer: (a) carbon dioxide is reduced to carbohydrate

25. Photolysis of water is associated with

(a) PSI

(b) PSII

(c) cytochrome b

(d) quinone

Answer: (b) PSII

26. Photorespiration occurs in

(a) C3 plants

(b) C4 plants

(c) all plants

(d) algae only

Answer: (b) C4 plants

27. Carbon dioxide fixation during C4 pathway occurs in the chloroplast of

(a) guard cells

(b) mesophyll cells

(c) spongy parenchyma

(d) bundle sheath cells

Answer: (d) bundle sheath cells

28. Structural component of chlorophyll among the following is

(a) magnesium

(b) manganese

(c) zinc

(d) iron

Answer: (a) magnesium

29. Calvin cycle is

(a) not dependent on light

(b) inhibited by light

(c) partly dependent on light

(d) dependent on light

Answer: (a) not dependent on light

30. Fructose 1-6 biphosphate splits into two triose phosphates by the enzyme

(a) amylase

(b) ligase

(c) aldolase

(d) zymase

Answer: (c) aldolase

31. C4 cycle is present in

(a) rice

(b) sugarcane

(c) pea

(d) Funaria

Answer: (b) sugarcane

32. What will be the number of Calvin cycles required to generate one molecule of hexose?

(a) 4

(b) 6

(c) 8

(d) 9

Answer: (b) 6

33. One quantasome contains

(a) 230 chlorophyll molecules

(b) 233 chlorophyll molecule

(c) 330 chlorophyll molecules

(d) a few molecules of chlorophyll

Answer: (a) 230 chlorophyll molecules

34. PEP is carbon dioxide acceptor in

(a) C3 plants

(b) Lichens

(c) C4 plants

(d) Hydrilla

Answer: (c) C4 plants

35. What happens in photosystem II?

(a) carbon dioxide fixation

(b) carbon dioxide reduction

(c) photolysis of water

(d) all of the above

Answer: (a) carbon dioxide fixation

36. The C4 plants are more efficient than C3 plants because

(a) they have two types of chloroplasts

(b) carbon dioxide acceptor in them is PEP

(c) they lack photorespiration

(d) none of these

Answer: (c) they lack photorespiration

37. The rate of photosynthesis per unit of light energy would be more in

(a) continuous bright light

(b) continuous dull light

(c) intermittent light

(d) normal blue light

Answer: (c) intermittent light

38. The site of dark reaction in photosynthesis is

(a) grana

(b) cytoplasm

(c) stroma

(d) thylakoid

Answer: (c) stroma

39. Which one does not evolve oxygen?

(a) green algae

(b) blue green algae

(c) autotrophic plants

(d) photosynthetic bacteria

Answer: (d) photosynthetic bacteria

40. Malic acid is found in C4 plants in the cells of

(a) epidermis

(b) bundle sheath

(c) phloem

(d) mesophyll

Answer: (d) mesophyll

41. Hatch and slack pathway is also known as

(a) C3 cycle

(b) C4 cycle

(c) C2 cycle

(d) none of these

Answer: (b) C4 cycle

42. Electrons from excited chlorophyll of PSII are accepted first by

(a) Quinone

(b) Ferredoxin

(c) cytochrome b

(d) cytochrome f

Answer: (a) Quinone

43. The law of limiting factors was proposed by

(a) F.F.Blackman

(b) D.Arnon

(c) Robert Hill

(d) R. Emmersion

Answer: (a) F.F.Blackman

44. Rate of photosynthesis is maximum in

(a) red and blue light

(b) blue and yellow light

(c) green light

(d) white light

Answer: (a) red and blue light

45. Photorespiration in C3 plants starts from

(a) phosphoglycerate

(b) phosphoglycolate

(c) glycerate

(d) glycine

Answer: (b) phosphoglycolate

46. A molecule of sedoheptulose has carbon atoms numbering

(a) 2

(b) 4

(c) 6

(d) 7

Answer: (d) 7

47. Emmersion effect is associated with

(a) respiration

(b) salt absorption

(c) photosynthesis

(d) transpiration

Answer: (c) photosynthesis

48. Which of the following is concerned with photo respiration ?

(a) dictyosomes

(b) peroxisomes

(c) glyoxisomes

(d) ribosomes

Answer: (b) peroxisomes

49. Net gain of ATP molecules during aerobic respiration is

(a) 36 molecules

(b) 38 molecules

(c) 40 molecules

(d) 48 molecules

Answer: (a) 36 molecules

50. Which pigment system is inactivated in red drop

(a) PS1 and PSII

(b) PSI

(c) PSII

(d) none of these

Answer: (b) PSI

51. Which element is located at the centre of the porphyrin ring in chlorophyll?

(a) calcium

(b) magnesium

(c) potassium

(d) manganese

Answer: (b) magnesium

52. Stomata of CAM plants

(a) are always open

(b) open during the day and close at night

(c) open during the day and close during the day

(d) never open

Answer: (c) open during the day and close during the day