Question

For assimilation of one CO2 molecule via photosynthesis, the energy required in form of ATP
and NADPH
a) 2 ATP and 2 NADPH, b) 5 ATP and 3 NADPH, c) 3 ATP and 2 NADPH, d) 18 ATP and 12
NADPH2​

Answer 1

for assimilation of one carbon dioxide molecule by a photosynthesis the energy required in form of ATP and NADPH is :-

c)3 ATP and 2 NADP

for more please refer to NCERT Biology class 11 page number 218

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Answer 2

For assimilation of one CO₂ molecule via photosynthesis, the energy required in form of ATP and NADPH is 3ATP and 2NADPH. (option c)

• For CO2 assimilation 3ATP and 2NADPH are required.
• Arnon was the first to use the term assimilatory power to refer to ATP and NADPH.
• The reduction of NADP into NADPH + H+ occurs through an electron transport chain (ETC) in photosynthesis.
• Whereas, the process by which ATP is produced from ADP and inorganic phosphate making use of the sunlight is called photophosphorylation.
• The electron flow through the electron transport chain is connected to photophosphorylation.
• For 1 Calvin cycle, 6 CO2 needs 18 ATP and 12 NADPH for the ultimate production of glucose.
• Thus 1 CO2 needs 3 ATP and 2 NADPH.
• Thus option c is correct.

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