The assimilatory power in photosynthesis is _____ .(a) ATP(b) NADPH(c) ATP and { NADPH }_{ 2 }(d) ATP, NADPH, and { CO }_{ 2 }

The assimilatory power in photosynthesis refers to the energy and reducing power required for the process of converting carbon dioxide into organic molecules (like glucose). In photosynthesis, assimilatory power is provided by two key molecules:

ATP (Adenosine Triphosphate): It provides the energy needed for various biochemical reactions in the Calvin cycle.
NADPH (Nicotinamide Adenine Dinucleotide Phosphate): It provides the reducing power needed for the reduction of carbon dioxide to form glucose.
These two molecules, ATP and NADPH, are produced during the light reactions of photosynthesis.

The correct answer to the question is (c) ATP and NADPH.

Explanation:

ATP provides energy, and NADPH provides reducing power for the fixation and reduction of CO2 in the Calvin cycle.
CO2 is the raw material for photosynthesis, but it is not considered "assimilatory power" itself.
So, the assimilatory power is a combination of ATP and NADPH.