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Assimilatory power is,
(a) ${ NADPH }_{ 2 }$
(b) $ATP$
(c) $ATP$ and ${ NADPH }_{ 2 }$
(d) ${FADH }_{ 2 }$

seo-qna
Last updated date: 16th Jun 2024
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Answer
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Hint: These assimilatory powers help in the fixation of carbon dioxide during the dark phase reaction. They are generated in light reactions and utilized in dark reactions.

Correct step by step answer:
$ATP$ and ${ NADPH }_{ 2 }$ are called assimilatory power because they provide the energy required for ${ C }{ O }_{ 2 }$ assimilation during the dark reaction of photosynthesis. They are the source of instant energy in a particular cell which helps in the regeneration or assimilation of several metabolic substances in a cell. A series of reactions that occur during photosynthesis in the inner area of the chloroplast that is the photosynthetic organelle in the plants. The path of light reaction of photosynthesis during which carbon dioxide is fixed using energy in the form of $ATP$ and ${ NADPH }_{ 2 }$ (nicotinamide adenine dinucleotide phosphate). The $ATP$ breaks to release the inorganic phosphates to provide energy during the assimilative process while ${ NADPH }_{ 2 }$ breaks into NADH and inorganic phosphate. The inorganic phosphate helps in the formation of regeneration of ATP. NADH also regenerates $ATP$, one molecule of $NADH$ produces $3 \ ATP$ molecules which in turn provides the power of assimilation to the cell. These are generated in the first stage of photosynthesis that is in the light reaction and utilized in the dark reaction of photosynthesis.
So, the correct answer is '$ATP$ and ${ NADPH }_{ 2 }$’.

Note:
- $ATP$ and ${ NADPH }_{ 2 }$ are the source of instant energy in a particular cell which helps in the regeneration or assimilation of several metabolic substances.
- $ATP$ and ${ NADPH }_{ 2 }$ are generated during the light reaction of photosynthesis and utilized during the dark reaction of photosynthesis.
- The inorganic phosphate helps in the formation of regeneration of $ATP$. $NADH$ also regenerates $ATP$.