Question

The final energy output of photosynthesis is:
(a) ATP
(b) NADPH
(c) ATP AND NADPH
(d) ATP, NADPH, and ${CO_2}$

Answer 1

Hint: The assimilatory power of photosynthesis is released during the photochemical stage. It is extracted in the thylakoids of chloroplasts. They are known as assimilatory because they provide the energy during the process of carbon dioxide assimilation.

Complete answer:
Assimilatory powers of photosynthesis are ATP and NADPH which are produced along with the oxygen during the photolysis of water. They are produced in the light reaction which is the first stage of photosynthesis. It happens in the thylakoid region of grana. The light stage is also known as the photochemical stage. The photons absorbed from the sunlight are used to make the energy-storing molecules called ATP and NADPH.
1. ATP or adenosine triphosphate is an energy-carrying molecule found in all living cells. It captures the energy produced by the breakdown of food particles and uses it in the cellular processes as a fuel.
2. At the end of the light reaction, the NADPH is formed which is used in the Calvin cycle.
3. Calvin cycle is also called the dark reaction or light-independent reaction.
4. Dark reactions do not need sunlight but use the energy absorbed during the light reaction.
5. In the dark reaction, the food is actually synthesized.

So, the correct answer is ‘ATP and NADPH’.

Note:
The process of photosynthesis is divided into 3 steps
1. Conversion of light energy into chemical energy. 2. Splitting of water into hydrogen and oxygen 3. Reduction of carbon dioxide into carbohydrates.
The glucose or sugar released at the end of photosynthesis is then used to grow.
They also produce a waste gas, which is oxygen. It is used by human beings for breathing.