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Photosynthesis in Higher Plants · Question 54

AIPMT 2007MCQEasy📈 Topic in 12% papers+4−1
1

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

Answer

(4) mesophyll

Solution

As per NCERT, in C4 plants the primary CO2 acceptor PEP (phosphoenolpyruvate) is present in the mesophyll cells, and the enzyme PEP carboxylase (PEPcase) fixes CO2 there.

⇒ PEP + CO2 → OAA (oxaloacetic acid) in mesophyll cells.

⇒ OAA is converted into malic acid (or aspartic acid) in the mesophyll cells itself, which is then transported to the bundle sheath cells.

Answer: (4)

AIPMT 2007

Keep practising — Photosynthesis in Higher Plants

2

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
3

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
4

In photosystem I, the first electron acceptor is

  1. an iron-sulphur protein
  2. ferredoxin
  3. cytochrome
  4. plastocyanin
AIPMT 2006
5

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
6

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
7

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
8

Chlorophyll in chloroplasts is located in

  1. Stroma
  2. Grana
  3. Pyrenoid
  4. Both (1) and (3)
AIPMT 2005
9

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
10

In C3 plants, the first stable product of photosynthesis during the dark reaction is

  1. malic acid
  2. oxaloacetic acid
  3. 3-phosphoglyceric acid
  4. phosphoglyceraldehyde
AIPMT 2004
11

Plants adapted to low light intensity have

  1. larger photosynthetic unit size than the sun plants
  2. higher rate of CO2 fixation than the sun plants
  3. more extended root system
  4. leaves modified to spines.
AIPMT 2004

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