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NEET • BIOLOGY • PHOTOSYNTHESIS IN HIGHER PLANTS

Photosynthesis in higher plants practice · Medium

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31 Medium
31 of 89
Remembering +4 | -1
Rubisco has the active site that binds to
View answer and explanation
Correct option: C
Either (a) or (b)
Option C (Either (a) or (b)) is correct because RuBisCO can bind to either CO2CO_2 or O2O_2 at its active site.
32 Medium
32 of 89
Remembering +4 | -1
Hill reaction occurs in
View answer and explanation
Correct option: D
Presence of ferricyanide
Option D (Presence of ferricyanide) is correct because Hill reaction, the light-dependent oxidation of water, can occur in isolated chloroplasts in the presence of a suitable electron acceptor like ferricyanide.
33 Medium
33 of 89
Analyzing +4 | -1
Find the incorrect statements with reference to calvin cycle :-
(a) The primary acceptor of CO is a 5-carbon ketose sugar.
(b) Calvin cycle does not occur in C4{C_4} and CAM plants.
(c) 6-turns of calvin cycle are required to produce one molecule of Hexose sugar.
(d) Sequence of stages of calvin cycle are carboxylation, regeneration and reduction.
View answer and explanation
Correct option: C
b and d
The correct answer is B (a, b and d) because these statements are incorrect about the Calvin cycle.
34 Medium
34 of 89
Understanding +4 | -1
In a CAM-plant, the concentration of organic acid
View answer and explanation
Correct option: C
Increases during night
Option C (Increases during night) is correct because in CAM plants, organic acids are synthesized and stored during the night.
35 Medium
35 of 89
Analyzing +4 | -1
Assertion (A): In C4C_4 plants, two carboxylations and one decarboxylation occurs during photosynthesis.

Reason (R): C4{C}_4 Plants, show kranz anatomy in all parts.
View answer and explanation
Correct option: C
Assertion is true but Reason is false
Option C (Assertion is true but Reason is false) is correct because C4 plants do have two carboxylations and one decarboxylation, but Kranz anatomy is present only in leaves, not in all parts of the plant.
36 Medium
36 of 89
Remembering +4 | -1
Warburg effect is the
View answer and explanation
Correct option: C
Inhibition of C3−{C_3} - cycle by O2{O_2}
Option C (Inhibition of C3−{C_3} - cycle by O2{O_2}) is correct because the Warburg effect describes the reduction in the rate of photosynthesis in C3{C_3} plants due to high oxygen concentrations.
37 Medium
37 of 89
Application +4 | -1
How many calvin cycles are required to produce 5 molecules of glucose?
View answer and explanation
Correct option: C
30
The correct answer is C (30) because 6 Calvin cycles are required to produce one molecule of glucose, therefore 5 molecules require 30 cycles.
38 Medium
38 of 89
Remembering +4 | -1
PEPPEP carboxylase is associated with
View answer and explanation
Correct option: D
1 and 3
Option D (1 and 3) is correct because PEP carboxylase is involved in carbon fixation in both CAM and C4 plants.
39 Medium
39 of 89
Analyzing +4 | -1
Mark the odd one (with respect to internal factors affecting photosynthesis)
View answer and explanation
Correct option: B
Light intensity
Option B (Light intensity) is correct because light intensity is an external factor, while the others are internal factors affecting photosynthesis.
40 Medium
40 of 89
Remembering +4 | -1
The membrane of thylakoid is called
View answer and explanation
Correct option: D
Thylakoid membrane
Option D (Thylakoid membrane) is correct because the membrane surrounding the thylakoid is, by definition, the thylakoid membrane.
41 Medium
41 of 89
Remembering +4 | -1
Flow of electrons in non-cyclic photo phosphorylation is
View answer and explanation
Correct option: D
Unidirectional (from PS-II to PS-I)
Option D (Unidirectional (from PS-II to PS-I)) is correct because in non-cyclic photophosphorylation, electrons flow unidirectionally from PS-II to PS-I.
42 Medium
42 of 89
Understanding +4 | -1
The most crucial step of Calvin cycle
View answer and explanation
Correct option: B
Is catalysed by RuBisCO
Option B (Is catalysed by RuBisCO) is correct because the carboxylation of RuBP by RuBisCO is the most crucial step in the Calvin cycle.
43 Medium
43 of 89
Understanding +4 | -1
Photosystem II
View answer and explanation
Correct option: B
Is attached to Oxygen evolving complex
Option B is correct because Photosystem II is associated with the Oxygen Evolving Complex (OEC), which is responsible for splitting water molecules.
44 Medium
44 of 89
Application +4 | -1
If 36 CO2C{O_2} molecules are fixed in C3{C_3} plant what will be?
1) The number of G3P and
2) Erythrose – 4 – phosphate formed during the dark reaction
View answer and explanation
Correct option: D
a=72, b=12
The correct answer is D (a=72, b=12) because 36 CO2 molecules will produce 72 G3P and 12 Erythrose-4-phosphate.
45 Medium
45 of 89
Remembering +4 | -1
In leaves of C4{C_4} plants, malic acid synthesis during CO2C{O_2} fixation occurs in?
View answer and explanation
Correct option: B
Mesophyll cells
Option B (Mesophyll cells) is correct because in C4 plants, malic acid synthesis from oxaloacetate occurs in the mesophyll cells.

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46 Medium
46 of 89
Understanding +4 | -1
In an experiment demonstrating the evolution of oxygen inHydrilla, sodium bicarbonate is added to water in the experimental set-up. What would happen if all other conditions are favorable?
View answer and explanation
Correct option: B
Amount of oxygen evolved increases as the availability of carbon dioxide increases
Option B is correct because sodium bicarbonate provides additional carbon dioxide, which is a substrate for photosynthesis, thus increasing oxygen production.
47 Medium
47 of 89
Remembering +4 | -1
When CO2C{O_2} is added to PEP, the first stable product synthesized is?
View answer and explanation
Correct option: D
Oxaloacetic acid
Option D (Oxaloacetic acid) is correct because when CO2 is added to PEP by PEP carboxylase, the first stable product is oxaloacetic acid (OAA).
48 Medium
48 of 89
Remembering +4 | -1
Adenosine diphosphate contains
View answer and explanation
Correct option: A
One high energy bonds
Option A (One high energy bonds) is correct because Adenosine diphosphate (ADP) contains one high-energy phosphate bond.
49 Medium
49 of 89
Analyzing +4 | -1
Assertion (A): Photosynthesis is a redox process.

Reason (R): Oxidation of carbon dioxide and reduction of water takes place in photosynthesis.
View answer and explanation
Correct option: C
Assertion is true but Reason is false
Option C is correct because while photosynthesis is a redox process, the reason is that water is oxidized and carbon dioxide is reduced, not the other way around.
50 Medium
50 of 89
Remembering +4 | -1
Photo System is made up of which of the following?
View answer and explanation
Correct option: C
Both (a) and (b)
Option C (Both (a) and (b)) is correct because a photosystem consists of both a reaction center and antenna molecules.
51 Medium
51 of 89
Understanding +4 | -1
Which of the following statements is not correct regarding Blackman’s law of limiting factors ?
View answer and explanation
Correct option: C
Temperature is the major limiting factor of photosynthesis
Option C (Temperature is the major limiting factor of photosynthesis) is not correct because Blackman's law states that the rate of a process is limited by the factor nearest its minimal value, not necessarily that temperature is always the major limiting factor.
52 Medium
52 of 89
Remembering +4 | -1
The synthesis of one molecule of glucose during Calvin cycle requires
View answer and explanation
Correct option: C
18 molecules of ATP and 12 molecules of NADPH2NADP{H_2}
Option C (18 molecules of ATP and 12 molecules of NADPH2) is correct because the Calvin cycle requires 18 ATP and 12 NADPH2 molecules to produce one molecule of glucose.
53 Medium
53 of 89
Analyzing +4 | -1
PEP carboxylase
I. is involved in atleast some CO2C{O_2} fixation in both C3{C_3} and C4−{C_4} - plants
II. Catalyses the reaction of fixing CO2C{O_2} into pyruvic acid in bundle sheath cells
III. is capable of fixing CO2C{O_2} more efficiently at lower atmospheric CO2C{O_2} concentration than RuBP carboxylase
Select the correct option
View answer and explanation
Correct option: D
Only III
The correct answer is D (Only III) because PEP carboxylase is more efficient at lower CO2 concentrations than RuBP carboxylase.
54 Medium
54 of 89
Analyzing +4 | -1
During the experiment in laboratory, the thylakoid is some how punctured so that the interior of the thylakoid is no longer separated from stroma. This damage will have the direction effect on
View answer and explanation
Correct option: A
ATP formation
The correct answer is A (ATP formation) because the proton gradient across the thylakoid membrane is essential for ATP synthesis.
55 Medium
55 of 89
Understanding +4 | -1
The enzyme that is not found in a C3{C_3} plant is?
View answer and explanation
Correct option: B
PEP Carboxylases
Option B (PEP Carboxylases) is correct because PEP carboxylase is the enzyme used for initial CO2 fixation in C4 and CAM plants, but not in C3 plants.
56 Medium
56 of 89
Application +4 | -1
The net requirement of assimilatory power for the formation of 6 hexose molecules in maize plant is
View answer and explanation
Correct option: D
180 ATP, 72 NADPH
The correct answer is D (180 ATP, 72 NADPH) because it accurately reflects the ATP and NADPH requirements for hexose synthesis in a C4 plant.
57 Medium
57 of 89
Understanding +4 | -1
The following (I-IV) are the main steps of chemosynthetic ATP synthesis in the light reaction. Arrange them in correct order
I.H+{H^ + } concentration gradient established
II. H+{H^ + } diffuses through ATP synthetase
III. Carriers use energy from electrons to move H+{H^ + } across the membrane
IV. Electrons from PS-II pass along electron transport chain
V. Light excites electrons in PS-II
VI. Energy of H+{H^ + } flow is used by ATP synthetase to make ATP
View answer and explanation
Correct option: C
V, IV, III, I, II, VI
Option C (V, IV, III, I, II, VI) is correct because it represents the correct sequence of events in chemiosmotic ATP synthesis during the light reaction.
58 Medium
58 of 89
Analyzing +4 | -1
What is the effect of high CO2C{O_2} concentration and higher values of ATP/ADP ratio?
View answer and explanation
Correct option: D
All of the above
The correct answer is D (All of the above) because high CO2 and ATP/ADP ratio affect Calvin cycle, Krebs cycle and glycolate cycle.
59 Medium
59 of 89
Analyzing +4 | -1
Assertion : Photorespiration decreases the
rate of photosynthesis.

Reason : Rate of respiration in C3{C_3}
and C4{C_4}
is
same.
View answer and explanation
Correct option: D
If both Assertion and Reason are false
Option D (If both Assertion and Reason are false) is correct because photorespiration does decrease the rate of photosynthesis, and the rate of respiration is NOT the same in C3 and C4 plants.
60 Medium
60 of 89
Remembering +4 | -1
Kranz anatomy is typical of?
View answer and explanation
Correct option: A
C4{C_4} plants
Option A (C4{C_4} plants) is correct because Kranz anatomy is a characteristic feature of C4 plants, facilitating the efficient capture of CO2.
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