The table below gives the difference between respiration and combustion. One of the entries in the table is wrong. Which one is it?

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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Solution

The wrong entry is:

Combustion

c. Combustion of hydrocarbons always produces only CO₂.

This is because combustion of hydrocarbon always produces carbon dioxide and water along with the generation of a huge amount of energy.

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	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.

The wrong entry is: Combustion c. Combustion of hydrocarbons always produces only CO2. This is because combustion of hydrocarbon always produces carbon dioxide and water along with the generation of a huge amount of energy.

The wrong entry is:

Combustion

c. Combustion of hydrocarbons always produces only CO₂.

This is because combustion of hydrocarbon always produces carbon dioxide and water along with the generation of a huge amount of energy.