NEET CONCEPT MCQ | Cha -13 |STD -11 | BIOLOGY | Eng medium

  

NEET CONCEPT  MCQ | Cha -13 |STD -11 

1. The bundle sheath cells of a C4 plant are
( a ) rich in PEPcase but lack RuBisCo ( b ) rich in RuBisCo and PEPcase
( c ) rich in RuBisCo but lack PEPcas   ( d ) without chloroplasts .

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

3. A decrease in photosynthetic rate with increased availability of oxygen is called ( a ) Richmond Lang effect ( b ) Warburg effect
( c ) Emerson effect              ( d ) none of these .

4. Identify curves P and Q in the given graph which shows the effects of CO₂ concentration on photosynthesis of C3 and C4 plants 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 .

5. Emerson effect indicates the existence of
( a ) two photosystems                 ( b ) two photosynthetic pigments
( c ) two photophosphorylations ( d ) none of these .

6. Which of the following can be referred to as " Hill reagent " in plants ?
( a ) ATP ( b ) NADP +  ( c ) NADPH   ( d ) FADH₂

7. Match column I with column II and select the correct option .

             Column I                                      Column II
A. Oxygen evolving complex    ( i ) Monomorphic chloroplasts
B. C3 plants                                 ( ii ) High oxygen concentration
C. Photorespiration                    ( iii ) Kranz anatomy
D. C4 plants                                 ( iv ) Photolysis of water

( a ) A- ( ii ) , B- ( iv ) , C- ( iii ) , D- ( i )      ( b ) A- ( i ) , B- ( iii ) , C- ( ii ) ,D- ( iv )
( c ) A- ( iv ) , B- ( i ) , C- ( ii ) , D- ( iii )      ( d ) A- ( ii ) , B- ( i ) , C- ( iv ) , D- ( iii )


8 . The most possible advantage of kranz anatomy in leaves of C4 plants is
( a ) consumption of less energy in CO₂ fixation
( b ) excessive photolysis of water
( c ) absence of competition between CO2 and O₂ for active sites of RuBisCo
( d ) all of these .

9 . If in an experiment the radioactive 14C containing carbon dioxide is provided to a C3 plant , the radioactivity will first appear in the compound
( a ) glyceraldehyde 3 - phosphate   ( b ) phosphoglyceric acid
( c ) phosphoenol pyruvate                ( d ) ribulose - 1 , 5 , biphosphate .

10. Read the following statements and identify the correct ones .
( i ) Z scheme of light reaction takes place only in the presence of PS I.
( ii ) Only PS I is functional in cyclic photophosphorylation .
( iii ) Cyclic photophosphorylation results in synthesis of ATP and NADPH ₂ .
( iv ) Stroma lamellae lack PS II and NADP .
( a ) ( ii ) and ( iv ) only
( b ) ( i ) and ( ii ) only
( c ) ( ii ) and ( iii ) only
( d ) ( iii ) and ( iv ) only

11. The chlorophyll structure proposed by Stoll and Fischer comprises of a
( a ) head of four pyrrole rings and an alcoholic phytol tail
( b ) head of phytol and tail of four pyrrole rings
( c ) head of linked carbons and tail of four pyrrole rings
( d ) head of four pyrrole rings and tail of linked nitrogens .

12.Read the following statements regarding photorespiration and select the incorrect ones .
I. RuBP binds with O₂ and forms one molecule of phosphoglycerate and phosphoglycolate .
II . RuBP binds with O₂ and is converted into two molecules of phosphoglycolate . III . There is no synthesis of sugar as well as ATP in this process .
IV . This process releases CO₂ along with consumption of ATP .
( a ) I and III only    ( b ) II and IV only
( c ) II only               ( d ) III only

13. The energy required to synthesise one molecule of glucose via Calvin cycle is ( a ) 3 ATP and 2 NADPH       ( b ) 12 ATP and 18 NADPH
( c ) 18 ATP and 12 NADPH   ( d ) 2 ATP and 3 NADPH .

14. In light reaction of photosynthesis , manganese ions are associated with
( a ) oxygen evolving complex      ( b ) cytochrome bg - f complex
( c ) ferredoxin                                 ( d ) plastocyanin .

15. DCMU , a potent herbicide kills plant by inhibiting
( a ) photosystem II ( b ) photosystem I ( c ) Calvin cycle ( d ) Krebs ' cycle .

16. 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 the availability of carbon dioxide increases .
( b ) Amount of oxygen evolved increases as carbon dioxide in water is absorbed by sodium bicarbonate .
( c ) Amount of oxygen evolved decreases as carbon dioxide in water is absorbed by sodium bicarbonate .
( d ) Amount of oxygen evolved increases as the availability of carbon dioxide increases .

17. The active component of photosystem I is composed of
( a ) 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 .

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

19. The first product of CO₂ fixation in Hatch - Slack Pathway 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 the mesophyll cells
( c ) formation of phosphoglyceric acid in the mesophyll cells
( d ) formation of phosphoglyceric acid in the bundle sheath cells .

20. During Calvin cycle , ATP is consumed during
( a ) carboxylation phase only  
( b ) regeneration phase only
( c ) both carboxylation and reduction phases
( d ) both phosphorylation and regeneration phases .

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Answer Key

1 . ( c ) 6 . ( b ) 11. ( a ) 16. ( d ) 2 . ( ૩ ) 7. ( c ) 12. ( c ) 17. ( b ) 3 . ( b ) 8. ( c ) 13. ( c ) 18. ( a ) 4. ( a ) 9. ( b ) 14. ( a ) 19. ( b ) 5. ( a ) 10. ( a ) 15. ( a ) 20. ( d )

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MANISH MEVADA

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GUJARAT BIOLOGY NEET

NEET MATERIAL IN GUJARATI 

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