Question

Assertion : Respiration in living beings is called exothermic reaction.
Reason: Respiration in living beings involves with absorption of heat energy.
(a) Both A and R are true and R is correct explanation of the assertion.
(b) Both A and R are true but R is not the correct explanation of the assertion
(c) A is true but R is false,
(d) A is false but R is true.​

Answer 1

Assertion : Respiration in living beings is called exothermic reaction.

Reason: Respiration in living beings involves with absorption of heat energy.

A is true but R is false

• Option (c) is correct.
• Respiration is an exothermic process because during respiration heat is produced.
• The formation of glucose takes place when the carbon dioxide present in the food breaks down.
• This formed glucose combines with the oxygen present in the cells of body and releases a high amount of energy.
• The chemical equation is given by : C6H12O6 + 6O2 → 6CO2 + 6H2O + Energy
• As respiration is an exothermic process, it does not involve absorption of heat energy.

Answer 2

(c) A is true but R is false

Explanation:

Respiration, in simple words, is called “combustion of glucose.”

Carbon dioxide present in food breaks down to form glucose. This glucose formed in the process undergoes chemical reaction with Oxygen present in the cells of our body and releases a high amount of energy. Since release of energy is termed as exothermic, respiration is an exothermic process.

The reaction involves:

C6H12O6 + 6O2 →6CO2 + 6H2O + Energy

Here, C6H12O6 = Glucose, O2 = Oxygen gas, CO2 = Carbon dioxide and H2O = Water.

We can see the energy is produced in the process not consumed. So, option (C) is correct.

Learn more about the Respiration process

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