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Photosynthesis in Higher Plants · Question 23

NEET (UG) 2022 (Phase 2)MCQMedium📈 Topic in 88% papers+4−1
1

When one CO2 molecule is fixed as one molecule of triose phosphate, which of the following photochemically made, high energy chemical intermediates are used in the reduction phase?

  1. 2 ATP + 2 NADPH
  2. 1 ATP + 1 NADPH
  3. 1 ATP + 2 NADPH
  4. 2 ATP + 1 NADPH

Answer

(1) 2 ATP + 2 NADPH

Solution

Carboxylation: RuBP + CO2 2 PGA

Reduction: each PGA → triose phosphate uses 1 ATP + 1 NADPH

⇒ for the 2 PGA formed from one CO2: 2 ATP + 2 NADPH

Regeneration of RuBP uses 1 more ATP, so as per NCERT the fixation of one CO2 needs 3 ATP and 2 NADPH in all; of these, 2 ATP + 2 NADPH are used in the reduction phase.

Answer: (1)

NEET (UG) 2022 (Phase 2)

Keep practising — Photosynthesis in Higher Plants

2

Identify the correct statements regarding chemiosmotic hypothesis: Choose the correct answer from the options given below:

  1. B, C and E only
  2. A, B and E only
  3. A, B and D only
  4. B, C and D only
NEET (UG) 2022 (Phase 2)
3

The first stable product of CO2 fixation in Sorghum is

  1. Phosphoglyceric acid
  2. Pyruvic acid
  3. Oxaloacetic acid
  4. Succinic acid
NEET (UG) 2021
4

Which of the following statements is incorrect?

  1. Cyclic photophosphorylation involves both PS I and PS II
  2. Both ATP and NADPH + H+ are synthesized during non-cyclic photophosphorylation.
  3. Stroma lamellae have PS I only and lack NADP reductase
  4. Grana lamellae have both PS I and PS II
NEET (UG) 2021
5

In light reaction, plastoquinone facilitates the transfer of electrons from

  1. PS-I to ATP synthase
  2. Cytb6f complex to PS-I
  3. PS-I to NADP+
  4. PS-II to Cytb6f complex
NEET (UG) 2020
6

The oxygenation activity of RuBisCO enzyme in photorespiration leads to the formation of

  1. 1 molecule of 3-C compound and 1 molecule of 2-C compound
  2. 1 molecule of 3-C compound
  3. 1 molecule of 6-C compound
  4. 2 molecules of 3-C compound
NEET (UG) 2020
7

Oxygen is not produced during photosynthesis by

  1. Cycas
  2. Green sulphur bacteria
  3. Chara
  4. Nostoc
NEET 2018
8

Which of the following is not a product of light reaction of photosynthesis?

  1. Oxygen
  2. NADH
  3. ATP
  4. NADPH
NEET 2018
9

With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct?

  1. Increasing atmospheric CO2 concentration up to 0.05% can enhance CO2 fixation rate.
  2. C3 plants respond to higher temperature with enhanced photosynthesis while C4 plants have much lower temperature optimum.
  3. Tomato is a greenhouse crop which can be grown in CO2-enriched atmosphere for higher yield.
  4. Light saturation for CO2 fixation occurs at 10% of full sunlight.
NEET 2017
10

Phosphoenol pyruvate (PEP) is the primary CO2 acceptor in

  1. C4 plants
  2. C2 plants
  3. C3 and C4 plants
  4. C3 plants
NEET 2017
11

In a chloroplast the highest number of protons are found in

  1. intermembrane space
  2. antennae complex
  3. stroma
  4. lumen of thylakoids.
NEET 2016 (Phase 1)

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