| 1. Burning fossil fuel decreases oxygen in atmosphere |
| 2. Burning fossil fuel increases carbon dioxide |
| 3. The main source of oxygen is atmosphere |
A) 1 only
B) 2 only
C) 3 only
D) None of the Above
Correct Answer: D
Solution :
Oxygen is a very important element for the existence of all flora and fauna. Atmosphere contains 21 % of oxygen. The main source of oxygen is atmosphere. Plants and animals absorb oxygen through respiration either from water or air and leaves through photosynthesis. In respiration process some of the oxygen returns to the atmosphere in the form of carbon dioxide and water vapour. During the process of photosynthesis gaseous oxygen is released completing the oxygen is of ozone is released completing the oxygen cycle. The source of ozone is the oxygen in the atmosphere. Ozone layer protects the living being from the UV radiation which reaches the earth. By burning fossil fuels man decreases the amount of oxygen in the atmosphere and increases the carbon dioxide content.
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