Numerical Problems/ISC/Class 11
Created by Titas Mallick
Biology Teacher • M.Sc. Botany • B.Ed. • CTET (CBSE) • CISCE Examiner
Created by Titas Mallick
Biology Teacher • M.Sc. Botany • B.Ed. • CTET (CBSE) • CISCE Examiner
Numerical Problems - Photosynthesis
If 12 molecules of water are consumed during the light-dependent reactions of photosynthesis, how many molecules of ATP and NADPH are theoretically produced?
Solution:
For every 2 molecules of water consumed in the light reactions, 2 molecules of NADPH and 3 molecules of ATP are produced (non-cyclic photophosphorylation).
Given: 12 molecules of water consumed.
Therefore, 12 molecules of NADPH and 18 molecules of ATP are theoretically produced.
How many turns of the Calvin cycle are required to produce one molecule of glucose (C6H12O6)? How many molecules of ATP and NADPH are consumed in this process?
Solution:
To produce one molecule of glucose (a 6-carbon sugar), the Calvin cycle needs to fix 6 molecules of carbon dioxide.
For each molecule of CO2 fixed, 3 ATP and 2 NADPH are consumed.
Therefore, 6 turns of the Calvin cycle are required, consuming 18 molecules of ATP and 12 molecules of NADPH.
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