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Photosynthesis in Higher Plants · Question 52

AIPMT 2008MCQMedium📈 Topic in 12% papers+4−1
1

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

Answer

(2) they have more chloroplasts

Solution

As per NCERT, C4 plants show Kranz anatomy: the bundle sheath cells around the vascular bundles are large, have a large number of chloroplasts, thick walls impervious to gaseous exchange and no intercellular spaces.

⇒ Besides the mesophyll chloroplasts, the chloroplast-rich bundle sheath carries out the Calvin cycle, so a C4 leaf has more chloroplasts taking part in carbon fixation.

⇒ CO2 released from C4 acids in the bundle sheath raises the intracellular CO2 concentration, so RuBisCO works as a carboxylase and photorespiration is minimised.

∴ C4 plants are photosynthetically more efficient (higher productivity and yield).

Answer: (2)

AIPMT 2008

Keep practising — Photosynthesis in Higher Plants

2

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
3

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
4

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
5

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
6

In photosystem I, the first electron acceptor is

  1. an iron-sulphur protein
  2. ferredoxin
  3. cytochrome
  4. plastocyanin
AIPMT 2006
7

As compared to a C3-plant, how many additional molecules of ATP are needed for net production of one molecule of hexose sugar by C4-plants?

  1. Two
  2. Six
  3. Twelve
  4. Zero
AIPMT 2005
8

Photosynthetic Active Radiation (PAR) has the following range of wavelengths.

  1. 340–450 nm
  2. 400–700 nm
  3. 500–600 nm
  4. 450–950 nm
AIPMT 2005
9

Photosynthesis in C4 plants is relatively less limited by atmospheric CO2 levels because

  1. effective pumping of CO2 into bundle sheath cells
  2. RuBisCo in C4 plants has higher affinity for CO2
  3. four carbon acids are the primary initial CO2 fixation products
  4. the primary fixation of CO2 is mediated via PEP carboxylase.
AIPMT 2005
10

Chlorophyll in chloroplasts is located in

  1. Stroma
  2. Grana
  3. Pyrenoid
  4. Both (1) and (3)
AIPMT 2005
11

Chemiosmotic theory of ATP synthesis in the chloroplasts and mitochondria is based on

  1. Proton gradient
  2. Membrane potential
  3. Accumulation of Na+ ions
  4. Accumulation of K+ ions
AIPMT 2005

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