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Photosynthesis in Higher Plants · Question 33

NEET 2016 (Phase 1)MCQEasy📈 Topic in 38% papers+4−1
1

In a chloroplast the highest number of protons are found in

  1. intermembrane space
  2. antennae complex
  3. stroma
  4. lumen of thylakoids.

Answer

(4) lumen of thylakoids.

Solution

As per NCERT (chemiosmotic hypothesis), protons accumulate inside the thylakoid lumen because:

∵ splitting of water occurs on the inner (lumen) side of the membrane, releasing H+ into the lumen;

∵ the primary acceptor/cytochrome complex pumps H+ from the stroma into the lumen;

∵ NADP reductase removes H+ from the stroma.

⇒ A proton gradient is built across the thylakoid membrane, with the highest H+ concentration (lowest pH) in the lumen.

Answer: (4)

NEET 2016 (Phase 1)

Keep practising — Photosynthesis in Higher Plants

2

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)
3

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)
4

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)
5

In photosynthesis, the light-independent reactions take place at

  1. photosystem II
  2. stromal matrix
  3. thylakoid lumen
  4. photosystem I.
AIPMT 2015
6

Bundle sheath cells :

  1. lack both RuBisCo and PEP carboxylase
  2. are rich in PEP carboxylase
  3. are rich in RuBisCo
  4. lack RuBisCo
NEET 2013 (Karnataka)
7

Read the following four statements (A – D). How many of the above statements are right?

  1. Two
  2. Three
  3. Four
  4. One
AIPMT 2012 (Mains)
8

A process that makes important difference between C3 and C4 plants is

  1. transpiration
  2. glycolysis
  3. photosynthesis
  4. photorespiration.
AIPMT 2012 (Prelims)
9

The correct sequence of cell organelles during photorespiration is

  1. chloroplast, Golgi-bodies, mitochondria
  2. chloroplast, rough endoplasmic reticulum, dictyosomes
  3. chloroplast, peroxisome, mitochondria
  4. chloroplast, vacuole, peroxisome.
AIPMT 2012 (Prelims)
10

In Kranz anatomy, the bundle sheath cells have

  1. thin walls, many intercellular spaces and no chloroplasts
  2. thick walls, no intercellular spaces and large number of chloroplasts
  3. thin walls, no intercellular spaces and several chloroplasts
  4. thick walls, many intercellular spaces and few chloroplasts.
AIPMT 2011 (Mains)
11

CAM helps the plants in

  1. conserving water
  2. secondary growth
  3. disease resistance
  4. reproduction.
AIPMT 2011 (Prelims)

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