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Photosynthesis in Higher Plants · Question 75

AIPMT 2000MCQEasy📈 Topic in 12% papers+4−1
1

Which is the first CO2 acceptor enzyme in C4 plants?

  1. RuDP carboxylase
  2. Phosphoric acid
  3. RuBisCO
  4. PEP- carboxylase

Answer

(4) PEP- carboxylase

Solution

As per NCERT, in C4 plants the primary CO2 acceptor is phosphoenol pyruvate (PEP), a 3-carbon molecule present in the mesophyll cells.

∵ The enzyme responsible for this fixation is PEP carboxylase (PEPcase), which forms the 4-carbon oxaloacetic acid (OAA).

∴ Mesophyll cells lack RuBisCO; RuBisCO (RuDP carboxylase) acts later, in the bundle sheath cells, in the Calvin cycle.

Answer: (4)

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2

For assimilation of one CO2 molecule, the energy required in form of ATP and NADPH2 are

  1. 2 ATP and 2 NADPH2
  2. 5 ATP and 3 NADPH2
  3. 3 ATP and 2 NADPH2
  4. 18 ATP and 12 NADPH2
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3

For the synthesis of one glucose molecule the Calvin cycle operates for

  1. 2 times
  2. 4 times
  3. 6 times
  4. 8 times
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4

The first step for initiation of photosynthesis will be

  1. photolysis of water
  2. excitation of chlorophyll molecules due to absorption of light
  3. ATP formation
  4. glucose formation
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