Difference between respiration and combustion.

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Solution

Respiration

1. It takes place in living cells only.

2. It is carried out with the help of various enzymes.

3. The oxidation of food and the liberation of energy occur in a step-wise manner.

4. It occurs at the body temperature of the organism.

5. 60% of energy escapes as body heat and 40% of energy is packaged directly into new chemical energy (ATP).

Combustion

1. It does not take place in the living cell.

2. Enzymes are not involved in this process.

3. The substances are oxidized spontaneously with sudden release of energy.

4. Sudden release of energy generates high temperature of a fire.

5. Energy released in combustion is dissipated as heat and to some extent as light.

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Aerobic respiration and Fermentation

	Respiration	Combustion
a.	Respiration is a slow process.	Combustion is relatively a fast process.
b.	Respiration takes place at the body temperature.	Combustion takes place at the ignition temperature of the fuel.
c.	Respiration produces CO₂ + H₂O and energy.	Combustion of hydrocarbons always produces only CO₂.
d.	Respiration takes place inside a cell.	Combustion takes place outside a cell.
e.	Respiration takes place at all times.	Combustion only takes place when a fuel or a combustible substance burns.

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