Photosynthesis in Higher Plants Practice Questions - DPP for NEET

 Page 1


Q.1 Which of the following pair is mismatched?
(a) Photosystem I – Uses the P
700
 molecule in
its photocenter.
(b) Antenna complex – Contains hundreds of
pigment molecule.
(c) PGA – 3- carbon compound.
(d) Dark reaction – Takes place in the grana of
the chloroplast.
Q.2 Match the parts given in column I with the events
given in column II and choose the correct
combination from the options given below.
Column-I Column-II
A. Grana of chloroplast I. Kreb's cycle
B. Stroma of chloroplast II. Light reaction
C. Cytoplasm III. Dark reaction
D. Mitochondrial matrix IV . Glycolysis
(a) A – IV; B – III; C – II; D – I
(b) A – I; B– II; C – IV; D – III
(c) A – IV; B – I; C – III; D –II
(d) A – II; B – III; C – IV; D – I
Q.3 Match column-I with column-II and choose
the correct combination from the options
given below.
Column -I Column -II
A. Oxygen evolving I. Pigments
complex
B. Proton gradient II. High oxygen
concentration
C. Absorb light at III. ATP synthesis
specific wavelengths.
D. Photorespiration IV . Photolysis of water
(a) A – IV; B – III; C – I; D – II
(b) A – IV; B – I; C – III; D – II
(c) A – II; B – I; C – IV; D – III
(d) A – II; B – IV; C – III; D – I
Q.4 Which of the following statements are
correct for effect of Carbon dioxide
concentration on photosynthesis ?
(i) Increase in concentration up to 0.05 per
cent can cause an increase in CO
2
fixation rates; beyond this the levels can
become damaging over longer periods
(ii) The C
3
 and C
4
 plants respond differently
to CO
2
 concentrations
(iii) At low light conditions neither C
3
 nor
C
4
 responds to high CO
2
 conditions
(iv) At high light intensities, both C
3
 and C
4
plants show increase in the rates of
photosynthesis
(v) C
4
 plants show saturation at about 360
?lL
–1
 while C
3
 responds to increased
CO
2
 concentration and saturation is
seen only beyond 450 ?lL
–1
(vi) Current availability of CO
2
 levels in
atmosphere is limiting to the C
3
 plants
(a) (i), (iv), (v), (vi)
(b) (ii), (iv), (v), (vi)
(c) (i), (ii), (iv), (v) and (vi)
(d) All are correct
Q.5 The diagram given below shows ATP
synthesis through chemiosmosis.
Which option shows the correct labelling of
A, B, C and D in the diagram ?
(a) A - F
1
, B - Thylakoid membrane,
C - Photosystem (I), D - Photosystem (II)
(b) A - F
0
, B - Thylakoid membrane,
C - Photosystem (I), D - Photosystem (II)
(c) A - F
1
, B - Thylakoid membrane,
C - Photosystem (II), D - Photosystem (I)
(d) A - F
0
, B - Thylakoid membrane,
C - Photosystem (II), D - Photosystem (I)
Q.6 Which statement is correct for photosynthesis
regarding light ?
(i) There is a linear relationship between
incident light and CO
2
 fixation rates at
low light intensities
BIOLOGY
Photosynthesis in Higher Plants
Page 2


Q.1 Which of the following pair is mismatched?
(a) Photosystem I – Uses the P
700
 molecule in
its photocenter.
(b) Antenna complex – Contains hundreds of
pigment molecule.
(c) PGA – 3- carbon compound.
(d) Dark reaction – Takes place in the grana of
the chloroplast.
Q.2 Match the parts given in column I with the events
given in column II and choose the correct
combination from the options given below.
Column-I Column-II
A. Grana of chloroplast I. Kreb's cycle
B. Stroma of chloroplast II. Light reaction
C. Cytoplasm III. Dark reaction
D. Mitochondrial matrix IV . Glycolysis
(a) A – IV; B – III; C – II; D – I
(b) A – I; B– II; C – IV; D – III
(c) A – IV; B – I; C – III; D –II
(d) A – II; B – III; C – IV; D – I
Q.3 Match column-I with column-II and choose
the correct combination from the options
given below.
Column -I Column -II
A. Oxygen evolving I. Pigments
complex
B. Proton gradient II. High oxygen
concentration
C. Absorb light at III. ATP synthesis
specific wavelengths.
D. Photorespiration IV . Photolysis of water
(a) A – IV; B – III; C – I; D – II
(b) A – IV; B – I; C – III; D – II
(c) A – II; B – I; C – IV; D – III
(d) A – II; B – IV; C – III; D – I
Q.4 Which of the following statements are
correct for effect of Carbon dioxide
concentration on photosynthesis ?
(i) Increase in concentration up to 0.05 per
cent can cause an increase in CO
2
fixation rates; beyond this the levels can
become damaging over longer periods
(ii) The C
3
 and C
4
 plants respond differently
to CO
2
 concentrations
(iii) At low light conditions neither C
3
 nor
C
4
 responds to high CO
2
 conditions
(iv) At high light intensities, both C
3
 and C
4
plants show increase in the rates of
photosynthesis
(v) C
4
 plants show saturation at about 360
?lL
–1
 while C
3
 responds to increased
CO
2
 concentration and saturation is
seen only beyond 450 ?lL
–1
(vi) Current availability of CO
2
 levels in
atmosphere is limiting to the C
3
 plants
(a) (i), (iv), (v), (vi)
(b) (ii), (iv), (v), (vi)
(c) (i), (ii), (iv), (v) and (vi)
(d) All are correct
Q.5 The diagram given below shows ATP
synthesis through chemiosmosis.
Which option shows the correct labelling of
A, B, C and D in the diagram ?
(a) A - F
1
, B - Thylakoid membrane,
C - Photosystem (I), D - Photosystem (II)
(b) A - F
0
, B - Thylakoid membrane,
C - Photosystem (I), D - Photosystem (II)
(c) A - F
1
, B - Thylakoid membrane,
C - Photosystem (II), D - Photosystem (I)
(d) A - F
0
, B - Thylakoid membrane,
C - Photosystem (II), D - Photosystem (I)
Q.6 Which statement is correct for photosynthesis
regarding light ?
(i) There is a linear relationship between
incident light and CO
2
 fixation rates at
low light intensities
BIOLOGY
Photosynthesis in Higher Plants
(ii) At higher light intensities, gradually the
rate does not show further increase as
other factors become limiting
(iii) Light saturation occurs at 10 per cent
of the full sunlight. Hence, except for
plants in shade or in dense forests, light
is rarely a limiting factor in nature
(iv) Increase in incident light beyond a point
causes the breakdown of chlorophyll
and a decrease in photosynthesis
(v) When light intensity increase then first
rate of photosynthesis increase than
becomes constant due to CO
2
 becomes
limiting factor
(a) (i), (ii), (iv) and (v) (b) (i), (ii), (iii) and (v)
(c) (i), (ii), (iii) and (iv) (d) All of these
Q.7 According to Blackman’s law of limiting
factor, at any given time, photosynthesis can
be limited by
(a) light only
(b) CO
2
 concentration only
(c) both light and CO
2
 concentration
(d) either by light or by CO
2
Q.8 During monsoon, the rice crop of eastern
states of India shows lesser yield due to
limiting factor of
(a) CO
2
(b) light
(c) temperature (d) water
Q.9 Why, at higher light intensities, gradually
photosynthesis rate does not show further
increase?
(a) Higher light intensity activate more
chlorophylls.
(b) Higher light intensity causes more
transpiration.
(c) No need of more sugar formation.
(d) Other factors become limiting.
Q.10 Under water stress, the rate of photosynthesis
declines because of
(a) stomatal closure leading to decrease in CO
2
supply.
(b) reduced water potential that decreases leaf
surface areas for photosynthesis.
(c) both (a) and (b)
(d) turgidity of leaf
Q.11 In C
4
 (sugarcane plant) plant,14CO
2
 is fixed
in malic acid in which the enzyme that fixes
CO
2
 is
(a) fructose phosphatase
(b) ribulose biphosphate carboxylase
(c) phosphoenol pyruvic acid carboxylase
(d) ribulose phosphate kinase
Q.12 What will happen if the supply of oxygen is
decreased to an illuminated wheat plant?
(a) Its photosynthesis would decrease
(b) Its respiration process would stop
(c) All physiological process would stop
(d) Its photosynthesis would increase
Q.13 Correct equation that represents the
photolysis of water is
(a) 2H
2
O ? 4H
+
 + O
2
 + 4e
–
(b) H
2
O ? 4H
+
 + O
2
 + 4e
–
(c) 4H
2
O ? 4H
+
 + O
2
 + 4e
–
(d) 2H
2
O ? 4H
+
 + 2O
2 
+ 2e
–
Q.14 The chemiosmotic mechanism mediates
(a) ATP synthesis
(b) splitting of water
(c) reduction of NADP
+
(d) flow of electrons from PS - II to PS - I
Q.15 ATP synthesis, in photosynthesis involves
the
(a) establishment of a proton gradient.
(b) oxidation of water.
(c) reduction of NADP
+
.
(d) flow of electrons.
Q.16 Statement I : The chemiosmotic hypothesis has
been put forward to explain the mechanism of
ATP synthesis in both respiration and
photosynthesis
Statement II : Like in respiration, in
photosynthesis too, ATP synthesis is linked to
development of a proton gradient across a
membrane
(a) Both statements are correct.
(b) Statement I is correct & II is incorrect.
(c) Statement I is incorrect & II is correct.
(d) Both statements are incorrect.
Page 3


Q.1 Which of the following pair is mismatched?
(a) Photosystem I – Uses the P
700
 molecule in
its photocenter.
(b) Antenna complex – Contains hundreds of
pigment molecule.
(c) PGA – 3- carbon compound.
(d) Dark reaction – Takes place in the grana of
the chloroplast.
Q.2 Match the parts given in column I with the events
given in column II and choose the correct
combination from the options given below.
Column-I Column-II
A. Grana of chloroplast I. Kreb's cycle
B. Stroma of chloroplast II. Light reaction
C. Cytoplasm III. Dark reaction
D. Mitochondrial matrix IV . Glycolysis
(a) A – IV; B – III; C – II; D – I
(b) A – I; B– II; C – IV; D – III
(c) A – IV; B – I; C – III; D –II
(d) A – II; B – III; C – IV; D – I
Q.3 Match column-I with column-II and choose
the correct combination from the options
given below.
Column -I Column -II
A. Oxygen evolving I. Pigments
complex
B. Proton gradient II. High oxygen
concentration
C. Absorb light at III. ATP synthesis
specific wavelengths.
D. Photorespiration IV . Photolysis of water
(a) A – IV; B – III; C – I; D – II
(b) A – IV; B – I; C – III; D – II
(c) A – II; B – I; C – IV; D – III
(d) A – II; B – IV; C – III; D – I
Q.4 Which of the following statements are
correct for effect of Carbon dioxide
concentration on photosynthesis ?
(i) Increase in concentration up to 0.05 per
cent can cause an increase in CO
2
fixation rates; beyond this the levels can
become damaging over longer periods
(ii) The C
3
 and C
4
 plants respond differently
to CO
2
 concentrations
(iii) At low light conditions neither C
3
 nor
C
4
 responds to high CO
2
 conditions
(iv) At high light intensities, both C
3
 and C
4
plants show increase in the rates of
photosynthesis
(v) C
4
 plants show saturation at about 360
?lL
–1
 while C
3
 responds to increased
CO
2
 concentration and saturation is
seen only beyond 450 ?lL
–1
(vi) Current availability of CO
2
 levels in
atmosphere is limiting to the C
3
 plants
(a) (i), (iv), (v), (vi)
(b) (ii), (iv), (v), (vi)
(c) (i), (ii), (iv), (v) and (vi)
(d) All are correct
Q.5 The diagram given below shows ATP
synthesis through chemiosmosis.
Which option shows the correct labelling of
A, B, C and D in the diagram ?
(a) A - F
1
, B - Thylakoid membrane,
C - Photosystem (I), D - Photosystem (II)
(b) A - F
0
, B - Thylakoid membrane,
C - Photosystem (I), D - Photosystem (II)
(c) A - F
1
, B - Thylakoid membrane,
C - Photosystem (II), D - Photosystem (I)
(d) A - F
0
, B - Thylakoid membrane,
C - Photosystem (II), D - Photosystem (I)
Q.6 Which statement is correct for photosynthesis
regarding light ?
(i) There is a linear relationship between
incident light and CO
2
 fixation rates at
low light intensities
BIOLOGY
Photosynthesis in Higher Plants
(ii) At higher light intensities, gradually the
rate does not show further increase as
other factors become limiting
(iii) Light saturation occurs at 10 per cent
of the full sunlight. Hence, except for
plants in shade or in dense forests, light
is rarely a limiting factor in nature
(iv) Increase in incident light beyond a point
causes the breakdown of chlorophyll
and a decrease in photosynthesis
(v) When light intensity increase then first
rate of photosynthesis increase than
becomes constant due to CO
2
 becomes
limiting factor
(a) (i), (ii), (iv) and (v) (b) (i), (ii), (iii) and (v)
(c) (i), (ii), (iii) and (iv) (d) All of these
Q.7 According to Blackman’s law of limiting
factor, at any given time, photosynthesis can
be limited by
(a) light only
(b) CO
2
 concentration only
(c) both light and CO
2
 concentration
(d) either by light or by CO
2
Q.8 During monsoon, the rice crop of eastern
states of India shows lesser yield due to
limiting factor of
(a) CO
2
(b) light
(c) temperature (d) water
Q.9 Why, at higher light intensities, gradually
photosynthesis rate does not show further
increase?
(a) Higher light intensity activate more
chlorophylls.
(b) Higher light intensity causes more
transpiration.
(c) No need of more sugar formation.
(d) Other factors become limiting.
Q.10 Under water stress, the rate of photosynthesis
declines because of
(a) stomatal closure leading to decrease in CO
2
supply.
(b) reduced water potential that decreases leaf
surface areas for photosynthesis.
(c) both (a) and (b)
(d) turgidity of leaf
Q.11 In C
4
 (sugarcane plant) plant,14CO
2
 is fixed
in malic acid in which the enzyme that fixes
CO
2
 is
(a) fructose phosphatase
(b) ribulose biphosphate carboxylase
(c) phosphoenol pyruvic acid carboxylase
(d) ribulose phosphate kinase
Q.12 What will happen if the supply of oxygen is
decreased to an illuminated wheat plant?
(a) Its photosynthesis would decrease
(b) Its respiration process would stop
(c) All physiological process would stop
(d) Its photosynthesis would increase
Q.13 Correct equation that represents the
photolysis of water is
(a) 2H
2
O ? 4H
+
 + O
2
 + 4e
–
(b) H
2
O ? 4H
+
 + O
2
 + 4e
–
(c) 4H
2
O ? 4H
+
 + O
2
 + 4e
–
(d) 2H
2
O ? 4H
+
 + 2O
2 
+ 2e
–
Q.14 The chemiosmotic mechanism mediates
(a) ATP synthesis
(b) splitting of water
(c) reduction of NADP
+
(d) flow of electrons from PS - II to PS - I
Q.15 ATP synthesis, in photosynthesis involves
the
(a) establishment of a proton gradient.
(b) oxidation of water.
(c) reduction of NADP
+
.
(d) flow of electrons.
Q.16 Statement I : The chemiosmotic hypothesis has
been put forward to explain the mechanism of
ATP synthesis in both respiration and
photosynthesis
Statement II : Like in respiration, in
photosynthesis too, ATP synthesis is linked to
development of a proton gradient across a
membrane
(a) Both statements are correct.
(b) Statement I is correct & II is incorrect.
(c) Statement I is incorrect & II is correct.
(d) Both statements are incorrect.
Q.17 The light-driven synthesis of ATP &
NADPH, provides energy and reducing
power for the
(a) conversion of inorganic carbon into organic
carbon.
(b) fixation of CO
2
 into trioses.
(c) for the production of sugars.
(d) all of the above.
Q.18 Statement I : In respiration, protons accumulate
in the intermembrane space of the mitochondria
when electrons move through the ETS
Statement II : In photosynthesis protons or
hydrogen ions that are produced by the NADH
accumulate within the lumen of the mitochondria.
(a) Both statements are correct.
(b) Statement I is correct & II is incorrect.
(c) Statement I is incorrect & II is correct.
(d) Both statements are incorrect.
Q.19 Which was the first CO
2
 fixation product
formed, in the Calvin experiment, using
radioactive labelled 
14
C in green algal?
(a) 2-carbon organic compound
(b) 3-carbon organic compound
(c) 4-carbon organic compound
(d) 5-carbon organic compound
Q.20 In Calvin cycle, RuBisCO incorporates CO
2
into ribulose 1, 5-bisphosphate which rapidly
splits into
(a) 2 molecules of 3-PGA
(b) 2 molecules of 2-PGA
(c) 3 molecules of 3-PGA
(d) 3 molecules of 2-PGA
Q.21 In C
4
 plants, the process by which C
4
 acid is
converted into C
3
 acid in the bundle sheath
cell is known as
(a) carboxylation (b) regeneration
(c) reduction (d) decarboxylation
Q.22 A process that creates an important
difference between C
3
 & C
4
 plants is called
____________.
(a) Calvin benson cycle
(b) photosynthesis
(c) photorespiration
(d) transpiration
Q.23 Photorespiration is a wasteful process because
(a) there is no synthesis of sugars.
(b) there is no synthesis of ATP or NADPH.
(c) there is no synthesis of phosphoglycerate.
(d) both (a) and (b)
Q.24 Photorespiration
(a) occurs because oxygen rather than carbon
dioxide links to the RuBisCO enzyme in the
Calvin cycle.
(b) occurs more in C
4
 than in C
3
 plants under
identical conditions.
(c) describes the uptake of CO
2
 & the release
of oxygen in chloroplasts.
(d) All of the above
Q.25 Which of the following statement is incorrect ?
(a) H
2
S, not H
2
O is involved in photosynthesis
of purple sulphur bacteria.
(b) Light and dark reactions are stopped in the
absence of light.
(c) Calvin cycle occurs in the grana of chloroplast.
(d) ATP is produced during light reaction via
chemiosmosis.
Q.26 Which of the following statement(s) is/are
correct about RuBisCO?
(a) It catalyzes the fixation of CO
2
.
(b) It has oxygenation & carboxylation both activity.
(c) It is the most abundant protein on earth.
(d) All of the above
Q.27 Statement I : Electron gradient is important
because breakdown of this gradient leads to
release of energy
Statement II : The gradient is broken down due
to the movement of protons across the thylakoid
membrane to the stroma.
(a) Both statements are correct.
(b) Statement I is correct & II is incorrect.
(c) Statement I is incorrect & II is correct.
(d) Both statements are incorrect.
Q.28 Which one of the following statement is
incorrect in relation to photorespiration?
(a) It is a characteristic of C
3
 plants.
(b) The RuBP binds with O
2
 to form one molecule
of phosphoglycerate and phosphoglycolate.
(c) There is synthesis of ATP or NADPH.
(d) It occurs in daytime only.
Page 4


Q.1 Which of the following pair is mismatched?
(a) Photosystem I – Uses the P
700
 molecule in
its photocenter.
(b) Antenna complex – Contains hundreds of
pigment molecule.
(c) PGA – 3- carbon compound.
(d) Dark reaction – Takes place in the grana of
the chloroplast.
Q.2 Match the parts given in column I with the events
given in column II and choose the correct
combination from the options given below.
Column-I Column-II
A. Grana of chloroplast I. Kreb's cycle
B. Stroma of chloroplast II. Light reaction
C. Cytoplasm III. Dark reaction
D. Mitochondrial matrix IV . Glycolysis
(a) A – IV; B – III; C – II; D – I
(b) A – I; B– II; C – IV; D – III
(c) A – IV; B – I; C – III; D –II
(d) A – II; B – III; C – IV; D – I
Q.3 Match column-I with column-II and choose
the correct combination from the options
given below.
Column -I Column -II
A. Oxygen evolving I. Pigments
complex
B. Proton gradient II. High oxygen
concentration
C. Absorb light at III. ATP synthesis
specific wavelengths.
D. Photorespiration IV . Photolysis of water
(a) A – IV; B – III; C – I; D – II
(b) A – IV; B – I; C – III; D – II
(c) A – II; B – I; C – IV; D – III
(d) A – II; B – IV; C – III; D – I
Q.4 Which of the following statements are
correct for effect of Carbon dioxide
concentration on photosynthesis ?
(i) Increase in concentration up to 0.05 per
cent can cause an increase in CO
2
fixation rates; beyond this the levels can
become damaging over longer periods
(ii) The C
3
 and C
4
 plants respond differently
to CO
2
 concentrations
(iii) At low light conditions neither C
3
 nor
C
4
 responds to high CO
2
 conditions
(iv) At high light intensities, both C
3
 and C
4
plants show increase in the rates of
photosynthesis
(v) C
4
 plants show saturation at about 360
?lL
–1
 while C
3
 responds to increased
CO
2
 concentration and saturation is
seen only beyond 450 ?lL
–1
(vi) Current availability of CO
2
 levels in
atmosphere is limiting to the C
3
 plants
(a) (i), (iv), (v), (vi)
(b) (ii), (iv), (v), (vi)
(c) (i), (ii), (iv), (v) and (vi)
(d) All are correct
Q.5 The diagram given below shows ATP
synthesis through chemiosmosis.
Which option shows the correct labelling of
A, B, C and D in the diagram ?
(a) A - F
1
, B - Thylakoid membrane,
C - Photosystem (I), D - Photosystem (II)
(b) A - F
0
, B - Thylakoid membrane,
C - Photosystem (I), D - Photosystem (II)
(c) A - F
1
, B - Thylakoid membrane,
C - Photosystem (II), D - Photosystem (I)
(d) A - F
0
, B - Thylakoid membrane,
C - Photosystem (II), D - Photosystem (I)
Q.6 Which statement is correct for photosynthesis
regarding light ?
(i) There is a linear relationship between
incident light and CO
2
 fixation rates at
low light intensities
BIOLOGY
Photosynthesis in Higher Plants
(ii) At higher light intensities, gradually the
rate does not show further increase as
other factors become limiting
(iii) Light saturation occurs at 10 per cent
of the full sunlight. Hence, except for
plants in shade or in dense forests, light
is rarely a limiting factor in nature
(iv) Increase in incident light beyond a point
causes the breakdown of chlorophyll
and a decrease in photosynthesis
(v) When light intensity increase then first
rate of photosynthesis increase than
becomes constant due to CO
2
 becomes
limiting factor
(a) (i), (ii), (iv) and (v) (b) (i), (ii), (iii) and (v)
(c) (i), (ii), (iii) and (iv) (d) All of these
Q.7 According to Blackman’s law of limiting
factor, at any given time, photosynthesis can
be limited by
(a) light only
(b) CO
2
 concentration only
(c) both light and CO
2
 concentration
(d) either by light or by CO
2
Q.8 During monsoon, the rice crop of eastern
states of India shows lesser yield due to
limiting factor of
(a) CO
2
(b) light
(c) temperature (d) water
Q.9 Why, at higher light intensities, gradually
photosynthesis rate does not show further
increase?
(a) Higher light intensity activate more
chlorophylls.
(b) Higher light intensity causes more
transpiration.
(c) No need of more sugar formation.
(d) Other factors become limiting.
Q.10 Under water stress, the rate of photosynthesis
declines because of
(a) stomatal closure leading to decrease in CO
2
supply.
(b) reduced water potential that decreases leaf
surface areas for photosynthesis.
(c) both (a) and (b)
(d) turgidity of leaf
Q.11 In C
4
 (sugarcane plant) plant,14CO
2
 is fixed
in malic acid in which the enzyme that fixes
CO
2
 is
(a) fructose phosphatase
(b) ribulose biphosphate carboxylase
(c) phosphoenol pyruvic acid carboxylase
(d) ribulose phosphate kinase
Q.12 What will happen if the supply of oxygen is
decreased to an illuminated wheat plant?
(a) Its photosynthesis would decrease
(b) Its respiration process would stop
(c) All physiological process would stop
(d) Its photosynthesis would increase
Q.13 Correct equation that represents the
photolysis of water is
(a) 2H
2
O ? 4H
+
 + O
2
 + 4e
–
(b) H
2
O ? 4H
+
 + O
2
 + 4e
–
(c) 4H
2
O ? 4H
+
 + O
2
 + 4e
–
(d) 2H
2
O ? 4H
+
 + 2O
2 
+ 2e
–
Q.14 The chemiosmotic mechanism mediates
(a) ATP synthesis
(b) splitting of water
(c) reduction of NADP
+
(d) flow of electrons from PS - II to PS - I
Q.15 ATP synthesis, in photosynthesis involves
the
(a) establishment of a proton gradient.
(b) oxidation of water.
(c) reduction of NADP
+
.
(d) flow of electrons.
Q.16 Statement I : The chemiosmotic hypothesis has
been put forward to explain the mechanism of
ATP synthesis in both respiration and
photosynthesis
Statement II : Like in respiration, in
photosynthesis too, ATP synthesis is linked to
development of a proton gradient across a
membrane
(a) Both statements are correct.
(b) Statement I is correct & II is incorrect.
(c) Statement I is incorrect & II is correct.
(d) Both statements are incorrect.
Q.17 The light-driven synthesis of ATP &
NADPH, provides energy and reducing
power for the
(a) conversion of inorganic carbon into organic
carbon.
(b) fixation of CO
2
 into trioses.
(c) for the production of sugars.
(d) all of the above.
Q.18 Statement I : In respiration, protons accumulate
in the intermembrane space of the mitochondria
when electrons move through the ETS
Statement II : In photosynthesis protons or
hydrogen ions that are produced by the NADH
accumulate within the lumen of the mitochondria.
(a) Both statements are correct.
(b) Statement I is correct & II is incorrect.
(c) Statement I is incorrect & II is correct.
(d) Both statements are incorrect.
Q.19 Which was the first CO
2
 fixation product
formed, in the Calvin experiment, using
radioactive labelled 
14
C in green algal?
(a) 2-carbon organic compound
(b) 3-carbon organic compound
(c) 4-carbon organic compound
(d) 5-carbon organic compound
Q.20 In Calvin cycle, RuBisCO incorporates CO
2
into ribulose 1, 5-bisphosphate which rapidly
splits into
(a) 2 molecules of 3-PGA
(b) 2 molecules of 2-PGA
(c) 3 molecules of 3-PGA
(d) 3 molecules of 2-PGA
Q.21 In C
4
 plants, the process by which C
4
 acid is
converted into C
3
 acid in the bundle sheath
cell is known as
(a) carboxylation (b) regeneration
(c) reduction (d) decarboxylation
Q.22 A process that creates an important
difference between C
3
 & C
4
 plants is called
____________.
(a) Calvin benson cycle
(b) photosynthesis
(c) photorespiration
(d) transpiration
Q.23 Photorespiration is a wasteful process because
(a) there is no synthesis of sugars.
(b) there is no synthesis of ATP or NADPH.
(c) there is no synthesis of phosphoglycerate.
(d) both (a) and (b)
Q.24 Photorespiration
(a) occurs because oxygen rather than carbon
dioxide links to the RuBisCO enzyme in the
Calvin cycle.
(b) occurs more in C
4
 than in C
3
 plants under
identical conditions.
(c) describes the uptake of CO
2
 & the release
of oxygen in chloroplasts.
(d) All of the above
Q.25 Which of the following statement is incorrect ?
(a) H
2
S, not H
2
O is involved in photosynthesis
of purple sulphur bacteria.
(b) Light and dark reactions are stopped in the
absence of light.
(c) Calvin cycle occurs in the grana of chloroplast.
(d) ATP is produced during light reaction via
chemiosmosis.
Q.26 Which of the following statement(s) is/are
correct about RuBisCO?
(a) It catalyzes the fixation of CO
2
.
(b) It has oxygenation & carboxylation both activity.
(c) It is the most abundant protein on earth.
(d) All of the above
Q.27 Statement I : Electron gradient is important
because breakdown of this gradient leads to
release of energy
Statement II : The gradient is broken down due
to the movement of protons across the thylakoid
membrane to the stroma.
(a) Both statements are correct.
(b) Statement I is correct & II is incorrect.
(c) Statement I is incorrect & II is correct.
(d) Both statements are incorrect.
Q.28 Which one of the following statement is
incorrect in relation to photorespiration?
(a) It is a characteristic of C
3
 plants.
(b) The RuBP binds with O
2
 to form one molecule
of phosphoglycerate and phosphoglycolate.
(c) There is synthesis of ATP or NADPH.
(d) It occurs in daytime only.
Q.29 Consider the following statements with
respect to photosynthesis and identify the
correct statements.
(i) The first carbon dioxide acceptor in C
4
cycle is PGA.
(ii) In C
3
 plants, the first stable product of
photosynthesis during dark reaction is
RuBP.
(iii) Cyclic photophosphorylation results in
the formation of ATP.
(iv) Oxygen which is liberated during
photosynthesis comes from water.
(a) (i) and (ii) (b) (i) and (iii)
(c) (iii) and (iv) (d) (ii) and (iii)
Q.30 Which of the following pair is not correctly matched?
(a) C
3
 plant – Maize
(b) C
4
 plant – Kranz anatomy
(c) Calvin cycle – PGA
(d) Hatch and Slack pathway – Oxaloacetic acid
Q.31 Which of the following is incorrectly matched?
(a) Sorghum — Kranz anatomy
(b) PS - II — P
700
(c) Photorespiration — C
3
 plants
(d) PEP carboxylase — Mesophyll cells
Q.32 Statement I : Movement of protons across the
thylakoid membrane to the stroma occurs through
the transmembrane channel of the CF
0
 of the ATP
synthase
Statement II : The breakdown of the gradient
provides enough energy to cause a conformational
change in the CF
0
 particle of the ATP synthase
(a) Both statements are correct.
(b) Statement I is correct & II is incorrect.
(c) Statement I is incorrect & II is correct.
(d) Both statements are incorrect.
Q.33 Statement I : Conformational change in the F
1
particle of the ATP synthase makes the enzyme
synthesise several molecules of energy-packed A TP
Statement II : Energy is used to pump protons
across a thylakoid membrane, to create a gradient
or a high concentration of protons within the
thylakoids lumen
(a) Both statements are correct.
(b) Statement I is correct & II is incorrect.
(c) Statement I is incorrect & II is correct.
(d) Both statements are incorrect.
Q.34 In non-cyclic reactions of photosynthesis,
electrons from chlorophyll molecules in
photosystem-I are used in the formation of
NADPH. What is the source of such electrons?
(a) Light
(b) NADPH
(c) Photosystem-I
(d) Photosystem-II, which splits water molecule
Q.35 The reactions of Calvin cycle not directly
dependent on light, but they usually do not
occur at night. Why?
(a) Night is often too cold for these reactions to occur.
(b) CO
2
 concentration in night is too high for
these reactions to occur.
(c) Plants usually open their stomata at night.
(d) Calvin cycle is dependent on the products of
light reaction.
Q.36 Statement I : As electrons move through the
photosystems, protons are transported across the
membrane.
Statement II : This happens because the primary
accepter of electron which is located towards the
outer side of the membrane transfers its electron
not to an electron carrier but to an H carrier.
(a) Both statements are correct.
(b) Statement I is correct & II is incorrect.
(c) Statement I is incorrect & II is correct.
(d) Both statements are incorrect.
Q.37 A student sets up an experiment on
photosynthesis as follows:
He takes soda water in a glass tumbler and
add chlorophyll extracts into the contents
and keeps the tumbler exposed to sunlight
hoping that he has provided necessary
ingredients for photosynthesis to proceed
(viz., CO
2
, H
2
O, chlorophyll and light). What
do you think what will happen after, say, a
few hours of exposure of light?
(a) Photosynthesis will take place and glucose
will be produced.
(b) Photosynthesis will take place and starch will
be produced which will turn the mixture turbid.
(c) Photosynthesis will not take place because
CO
2
 dissolved in soda water escapes into the
atmosphere.
(d) Photosynthesis will not take place because
intact chloroplasts are needed for the process.
Page 5


Q.1 Which of the following pair is mismatched?
(a) Photosystem I – Uses the P
700
 molecule in
its photocenter.
(b) Antenna complex – Contains hundreds of
pigment molecule.
(c) PGA – 3- carbon compound.
(d) Dark reaction – Takes place in the grana of
the chloroplast.
Q.2 Match the parts given in column I with the events
given in column II and choose the correct
combination from the options given below.
Column-I Column-II
A. Grana of chloroplast I. Kreb's cycle
B. Stroma of chloroplast II. Light reaction
C. Cytoplasm III. Dark reaction
D. Mitochondrial matrix IV . Glycolysis
(a) A – IV; B – III; C – II; D – I
(b) A – I; B– II; C – IV; D – III
(c) A – IV; B – I; C – III; D –II
(d) A – II; B – III; C – IV; D – I
Q.3 Match column-I with column-II and choose
the correct combination from the options
given below.
Column -I Column -II
A. Oxygen evolving I. Pigments
complex
B. Proton gradient II. High oxygen
concentration
C. Absorb light at III. ATP synthesis
specific wavelengths.
D. Photorespiration IV . Photolysis of water
(a) A – IV; B – III; C – I; D – II
(b) A – IV; B – I; C – III; D – II
(c) A – II; B – I; C – IV; D – III
(d) A – II; B – IV; C – III; D – I
Q.4 Which of the following statements are
correct for effect of Carbon dioxide
concentration on photosynthesis ?
(i) Increase in concentration up to 0.05 per
cent can cause an increase in CO
2
fixation rates; beyond this the levels can
become damaging over longer periods
(ii) The C
3
 and C
4
 plants respond differently
to CO
2
 concentrations
(iii) At low light conditions neither C
3
 nor
C
4
 responds to high CO
2
 conditions
(iv) At high light intensities, both C
3
 and C
4
plants show increase in the rates of
photosynthesis
(v) C
4
 plants show saturation at about 360
?lL
–1
 while C
3
 responds to increased
CO
2
 concentration and saturation is
seen only beyond 450 ?lL
–1
(vi) Current availability of CO
2
 levels in
atmosphere is limiting to the C
3
 plants
(a) (i), (iv), (v), (vi)
(b) (ii), (iv), (v), (vi)
(c) (i), (ii), (iv), (v) and (vi)
(d) All are correct
Q.5 The diagram given below shows ATP
synthesis through chemiosmosis.
Which option shows the correct labelling of
A, B, C and D in the diagram ?
(a) A - F
1
, B - Thylakoid membrane,
C - Photosystem (I), D - Photosystem (II)
(b) A - F
0
, B - Thylakoid membrane,
C - Photosystem (I), D - Photosystem (II)
(c) A - F
1
, B - Thylakoid membrane,
C - Photosystem (II), D - Photosystem (I)
(d) A - F
0
, B - Thylakoid membrane,
C - Photosystem (II), D - Photosystem (I)
Q.6 Which statement is correct for photosynthesis
regarding light ?
(i) There is a linear relationship between
incident light and CO
2
 fixation rates at
low light intensities
BIOLOGY
Photosynthesis in Higher Plants
(ii) At higher light intensities, gradually the
rate does not show further increase as
other factors become limiting
(iii) Light saturation occurs at 10 per cent
of the full sunlight. Hence, except for
plants in shade or in dense forests, light
is rarely a limiting factor in nature
(iv) Increase in incident light beyond a point
causes the breakdown of chlorophyll
and a decrease in photosynthesis
(v) When light intensity increase then first
rate of photosynthesis increase than
becomes constant due to CO
2
 becomes
limiting factor
(a) (i), (ii), (iv) and (v) (b) (i), (ii), (iii) and (v)
(c) (i), (ii), (iii) and (iv) (d) All of these
Q.7 According to Blackman’s law of limiting
factor, at any given time, photosynthesis can
be limited by
(a) light only
(b) CO
2
 concentration only
(c) both light and CO
2
 concentration
(d) either by light or by CO
2
Q.8 During monsoon, the rice crop of eastern
states of India shows lesser yield due to
limiting factor of
(a) CO
2
(b) light
(c) temperature (d) water
Q.9 Why, at higher light intensities, gradually
photosynthesis rate does not show further
increase?
(a) Higher light intensity activate more
chlorophylls.
(b) Higher light intensity causes more
transpiration.
(c) No need of more sugar formation.
(d) Other factors become limiting.
Q.10 Under water stress, the rate of photosynthesis
declines because of
(a) stomatal closure leading to decrease in CO
2
supply.
(b) reduced water potential that decreases leaf
surface areas for photosynthesis.
(c) both (a) and (b)
(d) turgidity of leaf
Q.11 In C
4
 (sugarcane plant) plant,14CO
2
 is fixed
in malic acid in which the enzyme that fixes
CO
2
 is
(a) fructose phosphatase
(b) ribulose biphosphate carboxylase
(c) phosphoenol pyruvic acid carboxylase
(d) ribulose phosphate kinase
Q.12 What will happen if the supply of oxygen is
decreased to an illuminated wheat plant?
(a) Its photosynthesis would decrease
(b) Its respiration process would stop
(c) All physiological process would stop
(d) Its photosynthesis would increase
Q.13 Correct equation that represents the
photolysis of water is
(a) 2H
2
O ? 4H
+
 + O
2
 + 4e
–
(b) H
2
O ? 4H
+
 + O
2
 + 4e
–
(c) 4H
2
O ? 4H
+
 + O
2
 + 4e
–
(d) 2H
2
O ? 4H
+
 + 2O
2 
+ 2e
–
Q.14 The chemiosmotic mechanism mediates
(a) ATP synthesis
(b) splitting of water
(c) reduction of NADP
+
(d) flow of electrons from PS - II to PS - I
Q.15 ATP synthesis, in photosynthesis involves
the
(a) establishment of a proton gradient.
(b) oxidation of water.
(c) reduction of NADP
+
.
(d) flow of electrons.
Q.16 Statement I : The chemiosmotic hypothesis has
been put forward to explain the mechanism of
ATP synthesis in both respiration and
photosynthesis
Statement II : Like in respiration, in
photosynthesis too, ATP synthesis is linked to
development of a proton gradient across a
membrane
(a) Both statements are correct.
(b) Statement I is correct & II is incorrect.
(c) Statement I is incorrect & II is correct.
(d) Both statements are incorrect.
Q.17 The light-driven synthesis of ATP &
NADPH, provides energy and reducing
power for the
(a) conversion of inorganic carbon into organic
carbon.
(b) fixation of CO
2
 into trioses.
(c) for the production of sugars.
(d) all of the above.
Q.18 Statement I : In respiration, protons accumulate
in the intermembrane space of the mitochondria
when electrons move through the ETS
Statement II : In photosynthesis protons or
hydrogen ions that are produced by the NADH
accumulate within the lumen of the mitochondria.
(a) Both statements are correct.
(b) Statement I is correct & II is incorrect.
(c) Statement I is incorrect & II is correct.
(d) Both statements are incorrect.
Q.19 Which was the first CO
2
 fixation product
formed, in the Calvin experiment, using
radioactive labelled 
14
C in green algal?
(a) 2-carbon organic compound
(b) 3-carbon organic compound
(c) 4-carbon organic compound
(d) 5-carbon organic compound
Q.20 In Calvin cycle, RuBisCO incorporates CO
2
into ribulose 1, 5-bisphosphate which rapidly
splits into
(a) 2 molecules of 3-PGA
(b) 2 molecules of 2-PGA
(c) 3 molecules of 3-PGA
(d) 3 molecules of 2-PGA
Q.21 In C
4
 plants, the process by which C
4
 acid is
converted into C
3
 acid in the bundle sheath
cell is known as
(a) carboxylation (b) regeneration
(c) reduction (d) decarboxylation
Q.22 A process that creates an important
difference between C
3
 & C
4
 plants is called
____________.
(a) Calvin benson cycle
(b) photosynthesis
(c) photorespiration
(d) transpiration
Q.23 Photorespiration is a wasteful process because
(a) there is no synthesis of sugars.
(b) there is no synthesis of ATP or NADPH.
(c) there is no synthesis of phosphoglycerate.
(d) both (a) and (b)
Q.24 Photorespiration
(a) occurs because oxygen rather than carbon
dioxide links to the RuBisCO enzyme in the
Calvin cycle.
(b) occurs more in C
4
 than in C
3
 plants under
identical conditions.
(c) describes the uptake of CO
2
 & the release
of oxygen in chloroplasts.
(d) All of the above
Q.25 Which of the following statement is incorrect ?
(a) H
2
S, not H
2
O is involved in photosynthesis
of purple sulphur bacteria.
(b) Light and dark reactions are stopped in the
absence of light.
(c) Calvin cycle occurs in the grana of chloroplast.
(d) ATP is produced during light reaction via
chemiosmosis.
Q.26 Which of the following statement(s) is/are
correct about RuBisCO?
(a) It catalyzes the fixation of CO
2
.
(b) It has oxygenation & carboxylation both activity.
(c) It is the most abundant protein on earth.
(d) All of the above
Q.27 Statement I : Electron gradient is important
because breakdown of this gradient leads to
release of energy
Statement II : The gradient is broken down due
to the movement of protons across the thylakoid
membrane to the stroma.
(a) Both statements are correct.
(b) Statement I is correct & II is incorrect.
(c) Statement I is incorrect & II is correct.
(d) Both statements are incorrect.
Q.28 Which one of the following statement is
incorrect in relation to photorespiration?
(a) It is a characteristic of C
3
 plants.
(b) The RuBP binds with O
2
 to form one molecule
of phosphoglycerate and phosphoglycolate.
(c) There is synthesis of ATP or NADPH.
(d) It occurs in daytime only.
Q.29 Consider the following statements with
respect to photosynthesis and identify the
correct statements.
(i) The first carbon dioxide acceptor in C
4
cycle is PGA.
(ii) In C
3
 plants, the first stable product of
photosynthesis during dark reaction is
RuBP.
(iii) Cyclic photophosphorylation results in
the formation of ATP.
(iv) Oxygen which is liberated during
photosynthesis comes from water.
(a) (i) and (ii) (b) (i) and (iii)
(c) (iii) and (iv) (d) (ii) and (iii)
Q.30 Which of the following pair is not correctly matched?
(a) C
3
 plant – Maize
(b) C
4
 plant – Kranz anatomy
(c) Calvin cycle – PGA
(d) Hatch and Slack pathway – Oxaloacetic acid
Q.31 Which of the following is incorrectly matched?
(a) Sorghum — Kranz anatomy
(b) PS - II — P
700
(c) Photorespiration — C
3
 plants
(d) PEP carboxylase — Mesophyll cells
Q.32 Statement I : Movement of protons across the
thylakoid membrane to the stroma occurs through
the transmembrane channel of the CF
0
 of the ATP
synthase
Statement II : The breakdown of the gradient
provides enough energy to cause a conformational
change in the CF
0
 particle of the ATP synthase
(a) Both statements are correct.
(b) Statement I is correct & II is incorrect.
(c) Statement I is incorrect & II is correct.
(d) Both statements are incorrect.
Q.33 Statement I : Conformational change in the F
1
particle of the ATP synthase makes the enzyme
synthesise several molecules of energy-packed A TP
Statement II : Energy is used to pump protons
across a thylakoid membrane, to create a gradient
or a high concentration of protons within the
thylakoids lumen
(a) Both statements are correct.
(b) Statement I is correct & II is incorrect.
(c) Statement I is incorrect & II is correct.
(d) Both statements are incorrect.
Q.34 In non-cyclic reactions of photosynthesis,
electrons from chlorophyll molecules in
photosystem-I are used in the formation of
NADPH. What is the source of such electrons?
(a) Light
(b) NADPH
(c) Photosystem-I
(d) Photosystem-II, which splits water molecule
Q.35 The reactions of Calvin cycle not directly
dependent on light, but they usually do not
occur at night. Why?
(a) Night is often too cold for these reactions to occur.
(b) CO
2
 concentration in night is too high for
these reactions to occur.
(c) Plants usually open their stomata at night.
(d) Calvin cycle is dependent on the products of
light reaction.
Q.36 Statement I : As electrons move through the
photosystems, protons are transported across the
membrane.
Statement II : This happens because the primary
accepter of electron which is located towards the
outer side of the membrane transfers its electron
not to an electron carrier but to an H carrier.
(a) Both statements are correct.
(b) Statement I is correct & II is incorrect.
(c) Statement I is incorrect & II is correct.
(d) Both statements are incorrect.
Q.37 A student sets up an experiment on
photosynthesis as follows:
He takes soda water in a glass tumbler and
add chlorophyll extracts into the contents
and keeps the tumbler exposed to sunlight
hoping that he has provided necessary
ingredients for photosynthesis to proceed
(viz., CO
2
, H
2
O, chlorophyll and light). What
do you think what will happen after, say, a
few hours of exposure of light?
(a) Photosynthesis will take place and glucose
will be produced.
(b) Photosynthesis will take place and starch will
be produced which will turn the mixture turbid.
(c) Photosynthesis will not take place because
CO
2
 dissolved in soda water escapes into the
atmosphere.
(d) Photosynthesis will not take place because
intact chloroplasts are needed for the process.
Q.38 Statement I : C
4
 Plant also show CO
2
 fixation
by Calvin cycle.
Statement II : Mesophyll cells in C
4
 plants show
Calvin cycle CO
2
 fixation.
(a) Both statements are correct.
(b) Statement I is correct & II is incorrect.
(c) Statement I is incorrect & II is correct.
(d) Both statements are incorrect.
Q.39 ADP is phosphorylated and NADP is
reduced, this happens during.
(a) dark phase of photosynthesis
(b) light phase of photosynthesis
(c) Photorespiration
(d) Calvin cycle
Q.40 During light reaction, as electrons move through
photosystems, protons are transported across
the membrane. This happens because of
(a) the primary acceptor of e– (located towards
the outer surface of the membrane) transfers
its electron not to an e
–
 carrier but to H carrier.
(b) the primary acceptor of e
–
 transfers only its
e
–
 to e
–
 carrier.
(c) the primary acceptor of e
–
 transfers only H
+
to the next carrier.
(d) NADP - reductase is present in grana.
Q.41 Assertion : Photosystem I (PS-I) and Photosystem II
(PS-II) are part of light harvesting complexes (LHC).
Reason : Photosystem I (PS-I) and Photosystem
II (PS-II) are named in the sequence in which
they function during the light reaction.
(a) Assertion and reason both are true and the
reason is correct explanation of assertion.
(b) Assertion and reason both are true but
reason is not correct explanation of assertion.
(c) Assertion is true but reason is wrong.
(d) Assertion and reason both are wrong.
Q.42 The function of water in photosynthesis is to
(a) absorb light energy.
(b) supply electrons in the light dependent reaction.
(c) transport H
+
 ions in the light independent reactions.
(d) provide O
2
 for the light-independent reactions.
Q.43 Which of the following is not concern with
cyclic photophosphorylation?
(a) Liberation of oxygen.
(b) Synthesis of ATP.
(c) It occurs in certain photosynthetic bacteria.
(d) Electron expelled from P
700
 return to it after
passing through different electron acceptor
Q.44 Photosynthesis is a/an
(a) physio-chemical process.
(b) physical process.
(c) chemical process.
(d) energy wasting process.
Q.45 Photosynthesis is important because
(a) it is the primary source of food on earth.
(b) it is responsible for release of O
2
 into the
atmosphere by green plants.
(c) it is responsible for release of water vapour
into the atmosphere.
(d) both (a) and (b)
Q.46 Half leaf experiment proves that
(a) light is essential for photosynthesis.
(b) CO
2
 is essential for photosynthesis.
(c) O
2
 releases during photosynthesis.
(d) chlorophyll is essential for photosynthesis.
Q.47 One of the earliest experiments on
photosynthesis was done in 1770 by Joseph
Priestley. He demonstrated that
(a) sun is the ultimate source of energy.
(b) water is essential for life.
(c) plants & animals “restore” the air for each other.
(d) chlorophyll captures light energy.
Q.48 Contribution of Ingen-Housz in elucidation
of process of photosynthesis is that
(a) only green parts of plants exposed to light
can convert foul air (CO
2
) into pure air (O
2
).
(b) green plants convert light energy into
chemical energy
(c) plants have the capacity to purify foul air.
(d) sunlight is the ultimate source of energy for
plants and animals.
Q.49 Assertion : Cyclic pathway of photosynthesis
first appeared in some eubacterial species.
Reason : Oxygen started accumulating in the
atmosphere after the non-cyclic pathway of
photosynthesis evolved.
(a) Assertion and reason both are true and the
reason is correct explanation of assertion.
(b) Assertion and reason both are true but
reason is not correct explanation of assertion.
(c) Assertion is true but reason is wrong.
(d) Assertion and reason both are wrong.