Question

why photosynthesis is considered as endothermic reaction​

Answer 1

Answer:

Any reaction in which the heat of the system before the reaction is more than the heat of the reaction after the reaction is called Endothermic.

If we observe, in photosynthesis plants absorb sunlight. Photosynthesis is an endothermic reaction because sunlight energy is absorbed during the process of photosynthesis by the plants. And our definition says that when in a reaction heat is absorbed it is termed as endothermic reaction.

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Answer 2

Answer:

Because it requires energy.

Explanation:

Photosynthesis involves formation of glucose from CO2 and H2O

6CO2 + 12H2O -----» C6H12O6 + 6O2 + 6H2O

In this reaction, Large molecule (Glucose) is formed from simpler molecule. 18ATP and 12NADPH is used for the formation of 1 molecule of Glucose

$= = = = = = = = = = = = = = = = = = = = = = = = =$

If you want to why formation of glucose req energy, read the below info:

CO2 and H2O are smaller molecules and the energy in these molecules are stored in the form of bonds present in them. In the formation of C6H12O6, more bonds are formed between 'O' and 'C' & H' and 'C'. This required further more energy than the energy stored in the form of bonds as in CO2 and H2O. Hence the reaction is endothermic.