Photosynthesis In Higher Plants — DPP 2

20 NEET questions from Photosynthesis In Higher Plants, with answers and explanations. Attempt it as a timed test to get scoring, accuracy breakdown and mistake tracking.

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1
Match the List-I with List-II to find out the correct option.
Photosynthesis In Higher Plants – NEET-6325
  1. A A-Q; B-S; C-R; D-P
  2. B A-S; B-P; C-R; D-Q
  3. C A-S; B-P; C-Q; D-R
  4. D A-Q; B-P; C-S; D-R
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Correct answer: C

2
Which one occurs both during cyclic and non-cyclic modes of photophosphorylation?
  1. A Involvement of both PS I and PS II
  2. B Formation of ATP
  3. C Release of $\mathrm{O}_{2}$
  4. D Formation of NADPH
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Correct answer: B

3
In sugarcane plant ${ }^{14} \mathrm{CO}_{2}$ molecules are fixed into malic acid. Which is the enzyme that fixes $\mathrm{CO}_{2}$ ?
  1. A Ribulose phosphate kinase
  2. B Fructose phosphatase
  3. C Ribulose biphosphate carboxylase
  4. D Phosphoenol pyruvic acid carboxylase
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Correct answer: D

4
Select the incorrect statement/s from the following.
  1. A The $\mathrm{C}_{3}$ and $\mathrm{C}_{4}$ plants respond differently to $\mathrm{CO}_{2}$ concentrations.
  2. B At low light conditions neither group responds to low $\mathrm{CO}_{2}$ conditions.
  3. C At high light intensities neither group responds to high $\mathrm{CO}_{2}$ conditions.
  4. D Both (2) and (3).
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Correct answer: D

5
Who demonstrated that photosynthesis is essentially a light dependent reaction in which hydrogen from a suitable oxidisable compound reduces carbon dioxide to carbohydrates?
  1. A Julius von Sachs
  2. B Cornelius van Niel
  3. C T.W. Engelmann
  4. D Jan Ingenhousz
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Correct answer: B

6
Which one of the following is not true about the light reactions of photosynthesis?
  1. A Light reaction provides energy for the photolysis of water through excitation of the reaction center of PS - II
  2. B The net flow of electrons from water to NADP in non-cyclic electron transport produces one ATP
  3. C Reactions of the two photosystems are needed for the reduction of NADP
  4. D $\mathrm{P}_{680}$ and $\mathrm{P}_{700}$ are the reaction centres of PS - I and PS - II respectively
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Correct answer: D

7
Identity 'a' and 'b' in given equation of photorespiration process.
$\mathrm{RuBP}+\mathrm{O}_{2} \rightarrow \mathrm{a}+\mathrm{b}$
  1. A $\mathrm{a}=\mathrm{b}=$ PGA
  2. B $\mathrm{a}=$ PGA, $\mathrm{b}=$ phosphoglycolate
  3. C $\mathrm{a}=$ phosphoglycolate, $\mathrm{b}=$ oxaloacetate
  4. D $\mathrm{a}=\mathrm{PGA}, \mathrm{b}=\mathrm{CO}_{2}$
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Correct answer: B

8
Plants are removed from patient's room during night because;
  1. A they consume $\mathrm{O}_{2}$ at night
  2. B they release $\mathrm{CO}_{2}$ at night
  3. C they produce $\mathrm{CO}_{2}$ all the time but release $\mathrm{O}_{2}$ only during day
  4. D they do not photosynthesise at night, so they increase $\mathrm{CO}_{2}$ concentration at night.
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Correct answer: C

9
PEP is primary $\mathrm{CO}_{2}$ acceptor in:
  1. A $\mathrm{C}_{4}$ plants
  2. B $\mathrm{C}_{3}$ plants
  3. C $\mathrm{C}_{2}$ plants
  4. D both $\mathrm{C}_{3}$ and $\mathrm{C}_{4}$ plants.
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Correct answer: A

10
Calvin cycle has three stages;
A. Reduction during which carbohydrate is formed at the expense of photochemically made ATP and NADPH.
B. Regeneration during which carbon dioxide acceptor 1,5-RuBP is formed.
C. Carboxylation during which $\mathrm{CO}_{2}$ combines with 1, 5 -RuBP.
Identify the correct sequence:
  1. A C, A, B
  2. B C, B, A
  3. C A, B, C
  4. D B, A, C
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Correct answer: A

11
How many of the given events are not related with photorespiration?
A. No synthesis of sugars
B. No synthesis of ATP and $\mathrm{NADPH}_{2}$
C. Occurs in $\mathrm{C}_{4}$ plants
D. Formation of oxaloacetic acid
  1. A Two
  2. B Three
  3. C Four
  4. D None
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Correct answer: A

12
The reaction that is responsible for the primary fixation of $\mathrm{CO}_{2}$ is catalysed by:
  1. A RuBP carboxylase
  2. B PEP carboxylase
  3. C RuBP carboxylase and PEP carboxylase
  4. D PGA synthase
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Correct answer: C

13
What is the oxidation product in case where $\mathrm{H}_{2} \mathrm{~S}$ is the hydrogen donor?
  1. A Sulphur or sulphide
  2. B Sulphate or sulphide
  3. C Sulphur or sulphate
  4. D Sulphate only
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Correct answer: C

14
Kranz's anatomy can be seen in the leaves of;
  1. A wheat
  2. B sugarcane
  3. C potatoes
  4. D mustard
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Correct answer: B

15
The correct sequence of flow of electrons in the light reaction is:
  1. A PS II, plastoquinone, cytochromes, PS I, ferredoxin
  2. B PS I, plastoquinone, cytochromes, PS II, ferredoxin
  3. C PS I, ferredoxin, PS II
  4. D PS I, plastoquinone, cytochromes, PS II, ferredoxin.
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Correct answer: A

16
The empirical equation representing the total process of photosynthesis for oxygen evolving organisms is;
  1. A $6 \mathrm{CO}_{2}+12 \mathrm{H}_{2} \mathrm{O} \xrightarrow{\text { Light }} \mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}_{6}+6 \mathrm{H}_{2} \mathrm{O}+6 \mathrm{O}_{2}$
  2. B $12 \mathrm{CO}_{2}+6 \mathrm{H}_{2} \mathrm{O} \xrightarrow{\text { Light }} \mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}_{6}+6 \mathrm{O}_{2}$
  3. C $\mathrm{CO}_{2}+\mathrm{H}_{2} \mathrm{O} \xrightarrow{\text { Light }}\left[\mathrm{CH}_{2} \mathrm{O}\right]+\mathrm{O}_{2}$
  4. D $\mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}_{6}+6 \mathrm{O}_{2} \xrightarrow{\text { Light }} 6 \mathrm{CO}_{2}+6 \mathrm{H}_{2} \mathrm{O}$
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Correct answer: C

17
Which of the following statements regarding $\mathrm{C}_{4}$ plants is false?
  1. A The primary $\mathrm{CO}_{2}$ acceptor is a 5-carbon molecule
  2. B The initial carboxylation reaction occurs in mesophyll
  3. C Calvin pathway does not take place in the mesophyll cells but does so only in bundle sheath cells.
  4. D Leaves fix $\mathrm{CO}_{2}$ in two cell types
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Correct answer: A

18
Which pigment acts directly to convert light energy to chemical energy?
  1. A Chlorophyll- $a$
  2. B Chlorophyll- $b$
  3. C Xanthophyll
  4. D Carotenoid
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Correct answer: A

19
Assertion (A): 12 molecules of $\mathrm{NADPH}^{+}+\mathrm{H}^{+}$and 18 ATP are used to form one hexose molecule.
Reason (R): Light reaction results in formation of ATP and $\mathrm{NADPH}_{2}$.
  1. A Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A)
  2. B Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A)
  3. C Assertion (A) is true, but Reason (R) is false
  4. D Assertion (A) is false, but Reason (R) is true
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Correct answer: B

20
The enzyme that is not found in a $\mathrm{C}_{3}$ plant is:
  1. A RuBP carboxylase
  2. B PEP carboxylase
  3. C NADP reductase
  4. D ATP synthase.
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Correct answer: B

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