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NEET CRASH COURSE PAPER -10 | Photosynthesis in Higher Plants 

1 . The given figure shows an experimental set - up to investigate photosynthesis . The plant was exposed to different light intensities and the rate of photo synthesis was estimated by counting the number of bubbles produced by the plant .

What can you infer from the given experiment ?
( a ) The rate of photosynthesis increases with increasing light intensities .
( b ) Light intensity limits photosynthesis upto a certain extent .
( c ) The rate of photosynthesis in the given experi mental set - up is determined by the rate production of oxygen gas .
( d ) All of these .

2 . Which of the following statements is true with regard to the light reaction of photosynthesis ?
( a ) In PSII the reaction centre chlorophyll a has an absorption peak at 700 nm , hence is called P 700 .
( b ) In PSI the reaction centre chlorophyll a has an absorption maxima at 680 nm and is called P 680 .
( c ) The splitting of water molecule is associated with PSI .
( d ) Photosystems I and II are involved in Z scheme .

3 . Chemiosmotic hypothesis given by Peter Mitchell proposes the mechanism of ( a ) synthesis of NADH
( b ) synthesis of ATP
( c ) synthesis of FADH₂
( d ) synthesis of NADPH .

4. In the given representation of Calvin cycle identify A , B and C and select the correct option .

           A               B            C
( a ) 3PGA      RuBP      Triose phosphate
( b ) RuBP       3PGA      Triose phosphate
( c ) PEP          OAA        Malic acid
( d ) PEP          RuBP        OAA

5. In photorespiration , glycine enters from
( a ) chloroplast to peroxisome
( b ) peroxisome to mitochondrion
( c ) mitochondrion to peroxisome
( d ) chloroplast to mitochondrion .

6 . Given figure represents C4 pathway . Select the suitable options for A , B and C.
                   A                         B                              C
( a ) Decarboxylation     Reduction            Regeneration
( b ) Fixation                   Transamination    Regeneration
( c ) Carboxylation         Decarboxylation    Reduction
( d ) Fixation                   Decarboxylation     Regeneration

7. Which of the following is correctly labelled for the given figure ?

          A                    B                  C                        D
( a ) PS II             PS I                 e-acceptor         LHC
( b ) LHC              e-acceptor      PS I                   PS II
( c ) PS I               PS II                e-acceptor         LHC
( d ) e-acceptor   LHC                 PS II                   PS I

8. Which of the following statements regarding C pathway is false ?
( a ) The primary CO₂ acceptor is phosphoenol pyruvate .
( b ) The enzyme responsible for CO₂ fixation is PEPcase .
( c ) The mesophyll cells lack RuBisCO enzyme .
( d ) The bundle sheath cells contain the enzyme PEPcase .

9. Read the given paragraph.
Light reactions and dark reactions occur in _ ( i ) and ( ii ) fraction of the chloroplast respectively . There are two pigment systems in photosynthesis , i.e. , PS - I and PS - II . The reaction centre of PS - II is ( iii ) . PS - II has ( iv ) chlorophyll to carotenoid ratio when compared to PS - I . Both PS - I and PS - II are involved in ( v ) photo phosphorylation .
Select the correct sequence of terms to complete the above paragraph .
         ( i )               ( ii )      ( iii )       ( iv )      ( v )
( a ) Stroma     Grana     P680    High      Cyclic
( b ) Grana       Stroma   P700    High      Cyclic
( c ) Grana       Stroma   P680     Low      Non - cyclic
( d ) Stroma     Grana     P700     Low      Non - cyclic

10. Photosynthetically active radiation ( PAR ) represents which of the following range of wavelength ?
( a ) 500-600 nm
( b ) 450-950 nm
( c ) 340-450 nm
( d ) 400-700 nm

11. Photosynthesis occurs in two phases , the light ( light dependent ) and dark ( light independent ) reactions . Correctly match the following reactions and processes .
         Light reactions                       Dark reactions
( a ) Production of sugars       Production of starch
( b ) Splitting of water              Production of sugars
( c ) Production of sugars       Breakdown of sugars to yield ATP
( d ) Splitting of light                Production of starch

12. When the separation of photosynthetic pigments are carried out using a strip of chromatographic paper , then the dried strip shows four distinct bands P , Q , R and S as shown in the given figure .

 Identify them and select the correct option .       

           P                           Q                               R                           S
( a ) Chlorophyll a         Chlorophyll b        Carotene            Xanthophyll
( b ) Xanthophyll           Carotene               Chlorophyll b      Colorophyll a  
( c ) Carotene                Xanthophyll          Cholorphyll a      Chlorophyll b
( d ) Chlorphyll b           Clorophyll a          Xanthophyll         Carotene

13. " In his experiment with an aquatic plant , he showed that in bright sunlight , small bubbles were formed around the green parts while in the dark , such bubbles did not form . " Identify ' he ' in the above experiment and the constitution of bubbles .
( a ) Joseph Priestley , foul air
( b ) Jan Ingenhousz , oxygen
( c ) Engelmann , carbon dioxide
( d ) Julius von Sachs , oxygen

14. The given graph shows the effects of CO₂ concentration on photosynthesis of C3 and C4 plants .
Identify curves P and Q in the graph and select the correct option .

( a ) P belongs to C4 , species and Q belongs to C3 species
( b ) P belongs to C3 species and Q belongs to C4 species
( c ) Both P and Q belong to C4 species , with P obtained at high light intensity and Q obtained at low light intensity
( d ) Both P and Q belong to C3 species , with P obtained at high light intensity and Q obtained at low light intensity .

15. The requirement of assimilatory power to fix 6 molecules of CO₂ is
( a ) 6ATP , 6 NADPH
( b ) 12 ATP , 18 NADPH
( c ) 18 ATP , 18 NADPH
( d ) 18 ATP , 12 NADPH .

16. The first product of CO₂ fixation in Hatch and Slack's pathway in plants is
( a ) formation of oxaloacetate by carboxylation of phosphoenol pyruvate ( PEP ) in the bundle sheath cells
( b ) formation of oxaloacetate by the carboxylation of phosphoenol pyruvate ( PEP ) in mesophyll cells
( c ) formation of phosphoglyceric acid in the mesophyll cells
( d ) formation of phosphoglyceric acid in the bundle sheath cells .

17. In C4 plants , CO₂ combines with
( a ) phosphoenol pyruvate
( b ) phosphoglyceraldehyde
( c ) phosphoglyceric acid
( d ) ribulose diphosphate .

18. Photosynthesis C4 plants is relatively less limited by atmospheric CO₂ levels because
( a ) effective pumping of CO₂ into bundle sheath cells
( b ) RuBisCo in C4 plants has higher affinity for CO2
( c ) four carbon acids are the primary initial CO₂ fixation products
( d ) the primary fixation of CO₂ is mediated via PEP carboxylase .

19. The C4 - plants differ from C3 - plants with reference to the
( a ) substrate that accepts CO₂ in carbon assimilation
( b ) type of end product
( c )  type of pigment involved in photosynthesis
( d ) number of NAPDPH that is used in fixation of one molecule of CO₂ .

20. In sugarcane plant 14CO₂ is fixed in malic acid , in which the enzyme that fixes CO₂ is
( a ) ribulose biphosphate carboxylase
( b ) phosphoenol pyruvic acid carboxylase
( c ) ribulose phosphate kinase
( d ) fructose phosphatase .

21. Photosynthetic bacteria contains
( a ) quantasome
( b ) PS - I and PS - II
( c ) PS - II
( d ) PS - I .

22. Which one of the following categories of organisms do not evolve oxygen during photosynthesis ?
( a ) Red algae
( b ) Photosynthetic bacteria
( c ) C4 plants with kranz anatomy
( d ) Blue green algae

23. Pigments of PS I are present in
( a ) appressed part of grana
( b ) stromal thylakoids and non - appressed part of granal thylakoids
( c ) both ( a ) and ( b )
( d ) none of these .

24. What differentiates PS II from PS I in photochemical reaction of photosynthesis ?
( a ) Production of NADPH₂
( b ) Production of ATP
( c ) Both ( a ) and ( b )
( d ) None of these

25. Which of the following is true ?
( a ) The bundle sheath cells surround the vascular bundles like a ring in C4 plants . This is called Kranz anatomy .
( b ) In CAM plants stomata are open in day time .
( c )  Bundle of sheath cells have PEPcase enzymes for CO₂ fixation .
( d ) C3 plants are superior to C4 plants .

26. During light reaction of photosynthesis , which of the following phenomenon is observed during cyclic phosphorylation well as non - cyclic as phosphorylation ?
( a ) Release of O₂
( b ) Formation of NADPH
( c ) Formation of ATP
( d ) Involvement of PS I and PS II

27. In mesophyll of C4 plants cells which of the following cycle takes place ?
( a ) C1
( b ) C3
( c ) C2
( d ) C4

28. During dark reaction , for the fixation of carbon , the three carbon atoms of each molecule of 3 - phospho glyceric acid ( PGA ) are derived from
( a ) RuBP only
( b ) RuBP + CO₂
( c ) CO₂ only
( d ) RuBP + CO₂ + PEP .

29. Which of the following inhibits O₂ release in light phase ?
( a ) PMA
( b ) Zeatin
( c ) DCMU
( d ) None of these

30. Which one is false about kranz anatomy ?
( a ) Bundle sheath have large chloroplast and less developed grana
( b ) Mesophyll cells have large chloroplast and more developed grana
( c ) It is found in Atriplex , sugarcane , maize
( d ) Plant having it has better photosynthesizing power than C3 plants

31. During photosynthesis , light is not directly required for
( a ) conversion of ADP to ATP
( b ) reduction of NADP + to NADPH
( c ) the formation of 3 - phosphoglycerate from car bon dioxide and ribulose 1 , 5 bisphosphate
( d ) splitting of water .

32. Who first demonstrated that light absorption by chlo roplast releases oxygen ?
( a ) Hill
( b ) Ingenhousz
( c ) Blackman
( d ) Engleman

33. Photosynthesis cannot continue for long if during light reaction , only cyclic photophosphorylation takes place . This is because
( a ) only ATP is formed , NADPH + H * is not formed
( b ) photosystem I stops getting exicted at a wave length of light beyond 680 nm
( c ) there is unidirectional cyclic movement of the electrons
( d ) there is no evolution of O₂ .

34. In an experiment demonstrating the evolution of oxy gen 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 the availability of carbon dioxide increases .
( b ) Amount of oxygen evolved increases as carbon dioxide in water is absorbed by sodium bicar bonate .
( c ) Amount of oxygen evolved decreases as carbon dioxide in water is absorbed by sodium bicar bonate .
( d ) Amount of oxygen evolved increases as the availability of carbon dioxide increases .

35. Which part of leaf is meant for photosynthesis and gaseous exchange ?
( a ) Bundle sheath with chloroplasts
( b ) Bundle sheath extensions
( c ) Palisade parenchyma
( d ) Spongy parenchyma

36. The 700 nm ( P700 ) is reaction centre of
( a ) PS I
( b ) PSII
( c ) both ( a ) and ( b )
( d ) none of these .

37. Read the following four statements , ( i ) , ( ii ) , ( iii ) and ( iv ) and select the right option having both correct statements .
Statements :
( i ) Z scheme of light reaction takes place in presence of PS I only
( ii ) Only PS I is functional in cyclic photophos phorylation .
( iii ) Cyclic photophosphorylation results into synthesis of ATP and NADPH₂
( iv ) Stroma lamellae lack PS II as well as NADP .
( a ) ( ii ) and ( iv )
( b ) ( i ) and ( ii )
( c ) ( ii ) and ( iii )
( d ) ( iii ) and ( iv )

38. Which one of the following statements about the events of noncyclic photophosphorylation is not correct ?
( a ) Only one photosystem participates
( b ) ATP and NADPH are produced
( c ) Photolysis of water takes place
( d ) O₂ is released

39. The active component of photosystem - 1 is composed of
( a )1 chlorophyll - a with absorption peak at 680 nm
( b ) chlorophyll - a with absorption peak at 700 nm
( c ) chlorophyll - d with absorption peak at 680 nm
( d ) chlorophyll - a and d with absorption peak at 700 nm .

40. In C3 cycle for the fixation of every CO₂ molecule , the reduction and regeneration steps require
( a ) 3 ATP and 2 NADPH₂
( b ) 2 ATP and 2 NADPH₂
( c ) 2 ATP and 3 NADPH₂
( d ) 3 ATP and 3 NADPH2 .

41. For the synthesis of one glucose molecule the Calvin cycle operates for
( a ) 2 times
( b ) 4 times
( c ) 6 times
( d ) 8 times .

42. Consider the following statements with respect to photosynthesis .
A. The first carbon dioxide acceptor in C4 cycle is PGA .
B. In C3 plants , the first stable product of photosyn thesis during dark reaction is RuBP .
C. Cyclic photophosphorylation results in the formation of ATP .
D. Oxygen which is liberated during photosynthesis comes from water .
Of the above statements
( a ) A and B alone are correct
( b ) A and C alone are correct
( c ) C and D alone are correct
( d ) B and C alone are correct .

43. The electron from photosystem II goes to photosystem I and finally taken up by NADP leaving an electron hole in photosystem II . This electron hole in photosystem II is filled up by the electron released from
( a ) CO₂
( b ) H₂O
( c ) chlorophyll
( d ) light .

44. The molecule which mainly absorbs light energy and converts it to chemical energy in photosynthesis is
( a ) phycocyanin
( b ) chlorophyll a
( c ) chlorophyll b
( d ) xanthophyll .

45. RuBisCo is an enzyme for
( a ) CO₂ fixation in dark reaction
( b ) photorespiration
( c ) regeneration of RuBP
( d ) photolysis of water .

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Ans key

1. D, 2.D, 3.B, 4.B, 5.B, 6.D, 7.A, 8.D, 9.C, 10.D, 11.B, 12.C, 13.B, 14.A, 15.D, 16.B, 17.A, 18.D, 19.A, 20.B, 21.D, 22.B, 23.B, 24.A, 25.A, 26.C, 27.D, 28.B, 29.C, 30.B, 31.C, 32.A, 33.A, 34.D, 35.D, 36.A, 37.A, 38.A, 39.B, 40.A, 41.C, 42.C 43.B, 44.B, 45.A

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