Need and Utility of Oxygen Present in Air
Need and Utility of Oxygen Present in Air: Overview
This topic explains concepts such as Necessity of Oxygen for Burning, Respiration in Living Organisms, Oxygen Cycle, Availability of Oxygen in Water, etc.
Important Questions on Need and Utility of Oxygen Present in Air
The gas released during the respiration is:
The gas necessary for burning any material is:
Why earthworms comes out of the soil during heavy rains.
The _____ gas is released by humans during respiration.
Fill in the blank to complete the words. Circle them in the word search.
Air is needed to light a F_R_
Plants use oxygen for respiration.
Which of these is not true for combustion?
Circulation of oxygen in various forms through nature is called _____. (Oxygen cycle/Carbon cycle)
Why your mother blows a pipe into the firewood stove to burn firewood.
Place a lighted candle on the table-top as shown in the picture. Cover the lighted candle with a glass tumbler. Why is the candle flame put out?
Place a lighted candle on the table-top as shown in the picture. Cover the lighted candle with a glass tumbler. What happens to the candle flame?
Look at the picture. The firewood stove has ember but it is not burning. What trick does your mother use to burn the firewood?
Mountaineers carry oxygen in cylinders when they climb mountains that are more than 5000m high. What could be the reason for that?
In the air, the part of oxygen is _____.
During respiration, which gas living being taken in?
Which gas is used in fire extinguisher? Why?
The percentage of oxygen in the air does not change because
Which of these is not true for combustion?
