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Photosynthesis in Higher Plants · Question 21

NEET (UG) 2022MCQMedium📈 Topic in 38% papers+4−1
1

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

Answer

(2) Breakdown of electron gradient

Solution

As per NCERT, chemiosmosis requires a membrane, a proton pump, a proton gradient and ATP synthase.

Protons accumulate in the lumen; NADP reductase on the stroma side removes protons from the stroma while reducing NADP.

The proton gradient is broken down as protons move across the membrane (through CF0 of ATP synthase) to the stroma ⇒ this releases the energy used for ATP synthesis.

∴ There is no 'electron gradient' in chemiosmosis.

Answer: (2)

NEET (UG) 2022

Keep practising — Photosynthesis in Higher Plants

2

What is the role of large bundle sheath cells found around the vascular bundles in C4 plants?

  1. To provide the site for photorespiratory pathway
  2. To increase the number of chloroplast for the operation of Calvin cycle
  3. To enable the plant to tolerate high temperature
  4. To protect the vascular tissue from high light intensity
NEET (UG) 2022
3

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
NEET (UG) 2022 (Phase 2)
4

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)
5

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
6

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
7

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
8

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
9

Oxygen is not produced during photosynthesis by

  1. Cycas
  2. Green sulphur bacteria
  3. Chara
  4. Nostoc
NEET 2018
10

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

  1. Oxygen
  2. NADH
  3. ATP
  4. NADPH
NEET 2018
11

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

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