PHOTOSYNTHESIS OF HIGHER PLANT MCQ

 

1. The components of PS-I are located on the

a) stroma                    

b) stroma thylakoid

c) granum thylakoid

d) outer surface  of stromal and granal thylakoid

 

2. Photolysis of water during photosynthesis occurs with the help of

a) PS-II                       b) PS-I

c) ferredoxin               d) cytochrome

 

3. Of the total incident solar radiation the proportion of PAR is

a) about 60%               b) less than 50%

c) more than 80%        d) about 70%

 

3. Presence of bundle sheath is a characteristic of

a) xerophytic plants  b) members of grass family

c) C₄-plants                 d) C₃-plants

 

4. In C₄-plants the bundle sheath cells

a) have thin walls to facilitate gaseous exchange

b) have large intercellular spaces

c) are rich in PEP carboxylase

d) have a high density of chloroplasts

 

5. Very strong light has a direct inhibiting effect on photosynthesis, which is known as

a) solarization              b) etiolation

c) chlorosis                  d) defoliation

 

6. First reaction in photosynthesis is

a) photolysis of water

b) excitation of chlorophyll molecule

c) formation of ATP

d) fixation of CO₂

 

7. In C₃ plants, the first stable product of photosynthesis during dark reaction is

a) PGAL         b) RuBP        c) PGA       d) OAA

 

8. Plastocyanin contains

a) copper         b) iron     c) calcium    d) potassium

 

9. Organelles associated with photorespiration are

a) chloroplast, mitochondria, peroxisome

b) chloroplast, mitochondria, lysosome

c) mitochondria, peroxisome, centrosome

d) nucleus, centrosome peroxisome

 

10. Cyclic photophosphorylation links to

a) PS-II                       b) PS-I

c) dark reaction           d) Both (a) and (b)

 

11. In C₃ cycle for the fixation of every CO₂ molecules, the reduction and regeneration steps required

a) 3 ATP and 2 NADPH₂

b) 2 ATP and 2 NADPH₂

c) 2 ATP and 3 NADPH₂

d) 3 ATP and 3 NADPH₂

 

12. Which of the following is formed during photorespiration?

a) sugar                        b) Phosphoglycolate

c) NADPH                  d)ATP

e)Oxaloacetate           

 

13. Which of the following is true for photosynthesis?

a)Reduction of  and water

b)Oxidation of  and water

c)Reduction of  and oxidation of water

d)Oxidation of and  reduction of water

 

14.Which of the following is not related to photorespiration?

a)Lysosome     b)Chloroplast 

c)Peroxisome   d)Mitochondria

 

15. With reference to three Calvin cycles, which of the given options is correct for the following question?

I)How many gross PGAL molecules are produced?

II)Total, how many ATP molecules are required for synthesis of PGAL molecules?

III)Total how many  molecules are required for the synthesis of obtained PGAL molecules?

a)I-3PGAL, II-3ATP,III-

b)I-6PGAL, II-6 ATP, III-6

c)I-18PGAL II-18 ATP, III-18

d)I-9 PGAL, II-9 ATP, III-9

 

16. In which cells of leaf, pyruvate is converted to PEP in C₄ pathway?

a) Epidermal cells        b) Mesophyll cells

c) Bundle sheath cells d) Guard cells

 

17. PGA as the first carbon dioxide fixation product was discovered in photosynthesis of

a) bryophyte                b) gymnosperm

c) angiosperm              d) alga

 

18. C₄-plants are more efficient in photosynthesis than C₃ plants due to

a) higher leaf area

b) presence of larger number of chloroplast in the leaf cells

c) presence of thin cuticle

d) tower rate of photorespiration

 

19. In a CAM-plant, the concentration of organic acid

a) increases during the day

b) decreases or increases during the day

c) increases during light

d) decreases during any time

 

20. Which one does not occur in cyclic photophosphorylation?

a) Oxygen is not given off

b) Water is not consumed

c) Only photosystem-I is involved

d) NADPH₂ formation

 

21.. Chlorophyll-a and b differ in having

a) chlorophyll-a has a methyl group and chlorophyll-b has an  aldehyde group in position X

b) chlorophyll-a has an aldehyde group and chlorophyll-b has a methyl group in position X

c) chlorophyll-a has a carboxyl group and chlorophyll-b has an  aldehyde group in position X

d) chlorophyll-a has an ethyl group and chlorophyll-b has  an aldehyde group in position X

 

22. In higher plants, the shape of the chloroplast is

a) discoid                    b) cup-shaped

c) girdle-shaped          d) reticulate

 

23.Q.32. Oxygenic photosynthesis occurs in

a) Chromatium            b) Oscillatoria

c) Rhodospirillum        d) Chlorobium

 

24. Stroma in the chloroplasts of higher plants contain

a) light-independent reaction enzymes

b) light-dependent reaction enzymes

c) ribosomes

d) chlorophyll

 

25. Cyclic-photophosphorylatin results in the formation of

a) NADPH                 

b) ATP and NADPH

c) ATP, NADPH and oxygen  

d) ATP

 

26. Which of the following elements is an activator for both ribulose biphosphate carboxylase oxygenase and phosphoenol pyruvate carboxylase in photosynthetic carbon fixation?

a) Mg²⁺            b) Zn²⁺             c) Ca²⁺        d)

 

27. Chlorophyll in chloroplasts is located in

a) grana                       b) pyrenoid

c) stroma                     d) Both (a) and (c)

 

28. Identify the incorrect statement with respect to Calvin cycle.

a) The carboxylation of RuBP is catalysed by Rubisco

b) The first stable intermediate compound formed is phosphoglycerate

c) 18 molecules of ATP are synthesised during carbon fixation

d) NADPH + H⁺ produced in light reaction is used to reduce diphosphoglycerate

 

29. In an experiment demonstrating the evolution of oxygen in Hydrilla, sodium bicarbonate is added to water in the experimental set-up. What would happen if all other conditions are favourable?

a) Amount of oxygen evolved decreases as carbon dioxide in water is absorbed by sodium bicarbonate

b) Amount of oxygen evolved increases as the availability of carbon dioxide increases

c) Amount of oxygen evolved decreases as the availability of carbon dioxide increases

d) Amount of oxygen evolved increases as carbon dioxide in water is absorbed by sodium bicarbonate

30.Q.47. Which statement about photosynthesis is false?

a) The electron carriers involved in photophosphorylation are located on the thylakoid membranes

b) Photosynthesis is a redox process, in which wate is oxidised and carbon dioxide is reduced

c) The enzymes required for carbon fixation are located only in the grana of chloroplasts

d) In green plants, both PS-I and PS-II are required for the formation of NADPH + H⁺

 

31. In C₃-plants, the first stable compound formed after carbon dioxide fixation is

a) phosphoglyceraldehyde    b) malic acid

c) oxaloacetic acid               d) 3-phosphoglycerate

 

32. The enzyme responsible for primary carboxylation in C₃-plants is

a) hexokinase

b) succinic dehydrogenase

c) pyruvate carboxylase

d) RuBP carboxylase oxygenase

 

33. In C₄-plants, the carbon dioxide fixation occurs in

a) guard cells               b) spongy cells

c) palisade cells           d) bundle sheath cells   

 

34. How many Calvin cycles are required to produce 5 molecules of glucose?

a) 60                b) 15                c) 30                d) 90

 

35. Which of the following is the first compound that accepts carbon dioxide during dark phase of photosynthesis?

a) NADP                     b) RuBP

c) Ferredoxin               d) Cytochrome

 

36. Which one is essential for the respiration as well as photosynthesis?

a) Rubisco                   b) Plastocyanin

c) Ubiquinone                         d) Cytochrome

 

37.Q.50. The mineral involved in the photolysis of water are

I. Manganese               II. Calcium

III. Magnesium           IV. Chloride

a) I and II only                        b) I, II  and IV only

c) I, II and III only     d) I and IV only

 

38. Which of the following is not true about the light reactions of photosynthesis?

a) Light energy provides energy for the photolysis of water through excitation of the reaction centre of PS-II

b) The flow of electrons from water to NADP in non-cyclic electron transport produces one ATP

c) Reactions of the two photosystems are needed for the reduction of NADP

d) P₆₈₀ and P₇₀₀ are the reaction centres of PS-I and PS-II respectively

 

39. Oxygen which is liberated during photosynthesis, comes from

a) carbon dioxide        b) water

c) chlorophyll              d) phosphoglyceric acid

 

40. The first carbon dioxide acceptor in C₄ cycle is

a) RuBP          b) PEP             c) PGA        d) OAA

 

41. Which of the following cell organelles is associated with photorespiration?

a) Mitochondria          b) Peroxisome

c) Chloroplast              d) All of these

 

42. The law of limiting factors was proposed with particular reference to photosynthesis. Identify the scientise, who proposed this law?

a) Calvin                      b) Weismann

c) Emerson                  d) Blackman

 

43. ____________ is a CAM plant.

a) Maize          b) Pineapple    c) Onion         d) Pea

.

 

 

44. In C₄-plants, the bundle sheath cells

a) have thin walls to facilitate gaseous exchange

b) have large intercellular spaces

c) are rich in PEP carboxylase

d) have a high density of chloroplasts

 

45. Etiolation in plants is caused when they

a) are grown in dark         

b) have mineral deficiency

c) are grown in intense light

d) are grown in blue light

 

46. The ration between 2-carbon and 3-carbon intermediates having – NH₂ group formed in photosynthetic oxidation cycle is

a) 1 : 1             b) 2 : 1             c) 3 : 2          d) 3 : 4