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Photosynthesis in Higher Plants · Question 76

AIPMT 2000MCQEasy📈 Topic in 88% papers+4−1
1

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

Answer

(3) 3 ATP and 2 NADPH2

Solution

As per NCERT, fixation of one CO2 molecule in the Calvin cycle requires 3 molecules of ATP and 2 molecules of NADPH.

Reduction of 3-PGA uses 2 ATP and 2 NADPH, and regeneration of RuBP uses 1 ATP.

⇒ Total for one CO2 = 3 ATP + 2 NADPH2

(For one glucose, 6 turns: 18 ATP + 12 NADPH2.)

Answer: (3)

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2

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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3

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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