Question

Why is photosynthesis considered an endothermic reaction?

Answer 1

Hint:To answer this question, you should recall the concept of photosynthesis. Photosynthesis is a process by which autotrophs convert light energy into chemical energy, which is later used to fuel cellular activities. The chemical energy is stored in the form of sugars, which are created from water and carbon dioxide.

Complete step by step solution:
Photosynthesis reaction involves two reactants, carbon dioxide and water. These two reactants yield two products, namely, oxygen and glucose. Hence, the photosynthesis reaction is considered to be an endothermic reaction. Following is the photosynthesis formula: \[6C{O_2} + 6{H_2}O \to {C_6}{H_{12}}{O_6} + 6{O_2}\]
Unlike plants, certain bacteria that perform photosynthesis do not produce oxygen as the by-product of photosynthesis. Such bacteria are called anoxygenic photosynthetic bacteria. The bacteria that do produce oxygen as a by-product of photosynthesis are called oxygenic photosynthetic bacteria.
Photosynthesis is an endothermic reaction because sunlight energy is absorbed by green plants during this process.

Note:
You should know that Photosynthesis process requires several factors such as:
Light Intensity: Increased light intensity results in a higher rate of photosynthesis. On the other hand, low light intensity results in a lower rate of photosynthesis.
The concentration of \[C{O_2}\]: Higher concentration of carbon dioxide helps in increasing the rate of photosynthesis. Usually, carbon dioxide in the range of \[{\text{300 - 400 PPM}}\] is adequate for photosynthesis.
Temperature: For efficient execution of photosynthesis, it is important to have a temperature range between \[25^\circ {\text{ }} - {\text{ }}35^\circ {\text{ }}C.\]
Water: As water is an important factor in photosynthesis, its deficiency can lead to problems in the intake of carbon dioxide. The scarcity of water leads to the refusal of stomatal opening to retain the amount of water they have stored inside.
Pollution: Industrial pollutants and other particles may settle on the leaf surface. This can block the pores of stomata which makes it difficult to take in carbon dioxide.