Which of the following plays a very important role in the oxygen cycle ?
Birds
Animals
Plants
Soil
The percentage of nitrogen in air is
21%
0.1%
54%
78%
____________ is known as the blanket of the Earth.
Atmosphere
Air
Water
Elements
From the below statements which denotes the presence of air
There is no movement of trees.
When we press bottles there is no air.
When we close bags air comes out.
Air is absent in inflated balloons.
Air is one of the main components which help in the _______________of seeds.
germination
reproduction
pollination
growth
When we heat water, we can find bubbles coming from it. This shows that
Water contains air
Air contains water
Hot water becomes bubbles
None
Smoke is an example of
Liquid-in-gas mixture
Gas-in-solid mixture
Solid-in-gas mixture
Gas-in-liquid mixture
It is not proper to breathe through our mouth because
Dust particles would enter our bodies
More carbon dioxide will be inhaled
Our throat will become sore
We will catch cold easily
Mountaineers carry oxygen cylinders with them because
Oxygen supports combustion
Air becomes thinner as we go higher
Air is dense but lacks oxygen in mountains
None of these
