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Photosynthesis in Higher Plants · Question 27

NEET (UG) 2020MCQMedium📈 Topic in 50% papers+4−1
1

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

Answer

(4) PS-II to Cytb6f complex

Solution

In the Z-scheme of non-cyclic electron transport:

PS-II (P680) ⇒ plastoquinone (PQ) ⇒ Cytb6f complex ⇒ plastocyanin (PC) ⇒ PS-I (P700) ⇒ ferredoxin ⇒ NADP+

⇒ Plastoquinone is the lipid-soluble mobile carrier that accepts electrons from PS-II and hands them over to the Cytb6f complex.

∵ Plastocyanin (not plastoquinone) carries electrons from Cytb6f to PS-I, and ferredoxin passes them from PS-I towards NADP+.

Answer: (4)

NEET (UG) 2020

Keep practising — Photosynthesis in Higher Plants

2

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
3

Oxygen is not produced during photosynthesis by

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

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

  1. Oxygen
  2. NADH
  3. ATP
  4. NADPH
NEET 2018
5

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
6

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
7

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)
8

Emerson's enhancement effect and Red drop have been instrumental in the discovery of

  1. photophosphorylation and cyclic electron transport
  2. oxidative phosphorylation
  3. photophosphorylation and non-cyclic electron transport
  4. two photosystems operating simultaneously.
NEET 2016 (Phase 1)
9

A plant in your garden avoids photorespiratory losses, has improved water use efficiency, shows high rates of photosynthesis at high temperatures and has improved efficiency of nitrogen utilisation. In which of the following physiological groups would you assign this plant?

  1. CAM
  2. Nitrogen fixer
  3. C3
  4. C4
NEET 2016 (Phase 1)
10

The process which makes major difference between C3 and C4 plants is

  1. glycolysis
  2. Calvin cycle
  3. photorespiration
  4. respiration.
NEET 2016 (Phase 2)
11

In photosynthesis, the light-independent reactions take place at

  1. photosystem II
  2. stromal matrix
  3. thylakoid lumen
  4. photosystem I.
AIPMT 2015

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