____________ helps the fish to absorb oxygen.
Nose
Skin
Gills
Fin
Which of the following gas cause the harmful green house effect ?
Hydrogen
Oxygen
Carbondioxide
Nitrogen
Pick the odd one out.
Birds
Fish
Animals
Insects
In seas and oceans, a large number of plants, fishes and other animals live without air. How is this possible ?
The plants and animals come to the surface in regular intervals.
Aquatic plants and animals do not need air to survive.
Water contains dissolved gases which enable them to live.
They survive because of the interdependence of plants and animals.
____________ is known as the blanket of the Earth.
Atmosphere
Air
Water
Elements
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
Heat some water in a vessel. What do you see on the sides of the vessel?
Bubbles
Lines
Dust
None of these
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.
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
Can we see the air?
Yes
No
Both a&b
