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Photosynthesis in Higher Plants · Question 22

NEET (UG) 2022MCQEasy📈 Topic in 12% papers+4−1
1

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

Answer

(2) To increase the number of chloroplast for the operation of Calvin cycle

Solution

In C4 plants (Kranz anatomy), the large bundle sheath cells around the vascular bundles have a large number of chloroplasts, thick walls impervious to gaseous exchange and no intercellular spaces.

CO2 released in these cells (from the C4 acid) enters the Calvin cycle, which operates only in the bundle sheath cells.

∴ Their role is to provide a large number of chloroplasts for the operation of the Calvin cycle (photorespiration does not occur in C4 plants).

Answer: (2)

NEET (UG) 2022

Keep practising — Photosynthesis in Higher Plants

2

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)
3

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)
4

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
5

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
6

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
7

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
8

Oxygen is not produced during photosynthesis by

  1. Cycas
  2. Green sulphur bacteria
  3. Chara
  4. Nostoc
NEET 2018
9

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

  1. Oxygen
  2. NADH
  3. ATP
  4. NADPH
NEET 2018
10

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
11

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

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