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Photosynthesis in Higher Plants · Question 11

NEET (UG) 2024MCQEasy📈 Topic in 88% papers+4−1
1

How many molecules of ATP and NADPH are required for every molecule of CO2 fixed in the Calvin cycle?

  1. 2 molecules of ATP and 3 molecules of NADPH
  2. 2 molecules of ATP and 2 molecules of NADPH
  3. 3 molecules of ATP and 3 molecules of NADPH
  4. 3 molecules of ATP and 2 molecules of NADPH

Answer

(4) 3 molecules of ATP and 2 molecules of NADPH

Solution

In the Calvin cycle, fixing one molecule of CO2 uses 2 ATP in reduction (2 molecules of 3-PGA → 2 G3P) and 1 ATP in regeneration of RuBP, i.e. 3 ATP in all.

The reduction step also uses 2 NADPH.

So every CO2 fixed needs 3 ATP and 2 NADPH (for one glucose: 18 ATP and 12 NADPH).

Answer: (4)

NEET (UG) 2024

Keep practising — Photosynthesis in Higher Plants

2

Which of the following are required for the dark reaction of photosynthesis? Choose the correct answer from the options given below:

  1. A, B and C only
  2. B, C and D only
  3. C, D and E only
  4. D and E only
NEET (UG) 2024
3

Given below are two statements: In the light of the above statements, choose the correct answer from the options given below:

  1. Both Statement I and Statement II are true
  2. Both Statement I and Statement II are false
  3. Statement I is true but Statement II is false
  4. Statement I is false but Statement II is true
NEET (UG) 2024
4

Which of the following are required for the light reaction of Photosynthesis? Choose the correct answer from the options given below:

  1. A, C, D and E only
  2. C, D and E only
  3. A and B only
  4. A, C and E only
RE-NEET (UG) 2024
5

Which one of the following products diffuses out of the chloroplast during photosynthesis?

  1. ADP
  2. NADPH
  3. O2
  4. ATP
RE-NEET (UG) 2024
6

Observe the given figure. Identify the different stages labelled with alphabets by selecting the correct option. [figure]

  1. A-Carboxylation, B-Regeneration, C-Reduction
  2. A-Reduction, B-Decarboxylation, C-Regeneration
  3. A-Carboxylation, B-Reduction, C-Regeneration
  4. A-Reduction, B-Carboxylation, C-Regeneration
RE-NEET (UG) 2024
7

How many ATP and NADPH are required for the synthesis of one molecule of Glucose during Calvin cycle?

  1. 18 ATP and 12 NADPH
  2. 12 ATP and 16 NADPH
  3. 18 ATP and 16 NADPH
  4. 12 ATP and 12 NADPH
NEET (UG) 2023
8

The reaction centre in PS II has an absorption maximum at

  1. 700 nm
  2. 660 nm
  3. 780 nm
  4. 680 nm
NEET (UG) 2023
9

Which of the following combinations is required for chemiosmosis?

  1. Membrane, proton pump, proton gradient, NADP synthase
  2. Proton pump, electron gradient, ATP synthase
  3. Proton pump, electron gradient, NADP synthase
  4. Membrane, proton pump, proton gradient, ATP synthase
NEET (UG) 2023
10

Given below are two statements: In the light of the above statements, choose the correct answer from the options given below :

  1. Both Statement I and Statement II are correct
  2. Both Statement I and Statement II are incorrect
  3. Statement I is correct but Statement II is incorrect
  4. Statement I is incorrect but Statement II is correct
NEET (UG) 2022
11

Which one of the following is not true regarding the release of energy during ATP synthesis through chemiosmosis? It involves:

  1. Breakdown of proton gradient
  2. Breakdown of electron gradient
  3. Movement of protons across the membrane to the stroma
  4. Reduction of NADP to NADPH2 on the stroma side of the membrane
NEET (UG) 2022

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