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Photosynthesis in Higher Plants · Question 46

AIPMT 2010 (Mains)MCQMedium📈 Topic in 12% papers+4−1
1

Study the pathway given below: [figure] In which of the following options correct words for all the three blanks A, B and C are indicated?

  1. A Fixation, B Transamination, C Regeneration
  2. A Decarboxylation, B Reduction, C Regeneration
  3. A Carboxylation, B Decarboxylation, C Reduction
  4. A Fixation, B Decarboxylation, C Regeneration

Answer

(4) A Fixation, B Decarboxylation, C Regeneration

Solution

The figure shows the Hatch and Slack (C4) pathway.

A: In mesophyll cells, HCO3- is fixed with phosphoenolpyruvate (PEP) by PEP carboxylase to form the C4 acid oxaloacetic acid ⇒ Fixation.

B: In bundle sheath cells, the C4 acid is broken down to release CO2 and a C3 acid ⇒ Decarboxylation.

C: The C3 acid (pyruvic acid) is transported back to the mesophyll cells and converted to PEP again ⇒ Regeneration.

As per NCERT, the primary CO2 acceptor PEP is regenerated in the mesophyll cells, completing the cycle.

Answer: (4)

AIPMT 2010 (Mains)

Keep practising — Photosynthesis in Higher Plants

2

PGA as the first CO2 fixation product was discovered in photosynthesis of

  1. bryophyte
  2. gymnosperm
  3. angiosperm
  4. alga
AIPMT 2010 (Prelims)
3

C4 plants are more efficient in photosynthesis than C3 plants due to

  1. higher leaf area
  2. presence of larger number of chloroplasts in the leaf cells
  3. presence of thin cuticle
  4. lower rate of photorespiration
AIPMT 2010 (Prelims)
4

Cyclic photophosphorylation results in the formation of

  1. ATP and NADPH
  2. ATP, NADPH and O2
  3. ATP
  4. NADPH.
AIPMT 2009
5

Stroma in the chloroplasts of higher plants contains

  1. light-dependent reaction enzymes
  2. ribosomes
  3. chlorophyll
  4. light-independent reaction enzymes.
AIPMT 2009
6

Electrons from excited chlorophyll molecule of photosystem II are accepted first by

  1. quinone
  2. ferredoxin
  3. cytochrome-b
  4. cytochrome-f
AIPMT 2008
7

The C4 plants are photosynthetically more efficient than C3 plants because

  1. the CO2 efflux is not prevented
  2. they have more chloroplasts
  3. the CO2 compensation point is more
  4. CO2 generated during photorespiration is trapped and recycled through PEP carboxylase
AIPMT 2008
8

In leaves of C4 plants malic acid synthesis during CO2 fixation occurs in

  1. bundle sheath
  2. guard cells
  3. epidermal cells
  4. mesophyll cells
AIPMT 2008
9

In the leaves of C4 plants, malic acid formation during CO2 fixation occurs in the cells of

  1. bundle sheath
  2. phloem
  3. epidermis
  4. mesophyll
AIPMT 2007
10

The first acceptor of electrons from an excited chlorophyll molecule of photosystem II is

  1. iron-sulphur protein
  2. ferredoxin
  3. quinone
  4. cytochrome
AIPMT 2007
11

During photorespiration, the oxygen consuming reaction(s) occur in

  1. stroma of chloroplasts
  2. stroma of chloroplasts and mitochondria
  3. stroma of chloroplasts and peroxisomes
  4. grana of chloroplasts and peroxisomes
AIPMT 2006

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