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Photosynthesis in Higher Plants · Question 34

NEET 2016 (Phase 1)MCQMedium📈 Topic in 50% papers+4−1
1

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.

Answer

(4) two photosystems operating simultaneously.

Solution

Red drop: the quantum yield of photosynthesis falls sharply when only far-red light (beyond 680 nm) is used.

Emerson's enhancement effect: when far-red light is supplemented with shorter-wavelength red light, the rate of photosynthesis becomes greater than the sum of the rates with each light alone.

⇒ This showed that two pigment systems (PS I with P700 and PS II with P680) work together.

∴ These experiments led to the discovery of two photosystems operating simultaneously.

Answer: (4)

NEET 2016 (Phase 1)

Keep practising — Photosynthesis in Higher Plants

2

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)
3

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)
4

In photosynthesis, the light-independent reactions take place at

  1. photosystem II
  2. stromal matrix
  3. thylakoid lumen
  4. photosystem I.
AIPMT 2015
5

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)
6

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)
7

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

  1. transpiration
  2. glycolysis
  3. photosynthesis
  4. photorespiration.
AIPMT 2012 (Prelims)
8

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)
9

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)
10

CAM helps the plants in

  1. conserving water
  2. secondary growth
  3. disease resistance
  4. reproduction.
AIPMT 2011 (Prelims)
11

Read the following four statements, (i), (ii), (iii) and (iv) and select the right option having both correct statements. Statements : (i) Z scheme of light reaction takes place in presence of PS I only. (ii) Only PS I is functional in cyclic photophosphorylation. (iii) Cyclic photophosphorylation results into synthesis of ATP and NADPH2. (iv) Stroma lamellae lack PS II as well as NADP reductase.

  1. (ii) and (iv)
  2. (i) and (ii)
  3. (ii) and (iii)
  4. (iii) and (iv)
AIPMT 2010 (Mains)

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