Hot Questions : Thinks and answer : (Lesson : 16) 1) Can you think of one observation in your daily life which shows the presence of water vapour in the air? 2) Is it good to sleep under a tree a) during the day, b) at night? Give reasons. 3) People living in a certain region have a high incidence of skin cancer. Can you identify one possible cause for this? 4) Why do you think air becomes thinner higher up?(Hint: think of which force holds the atmosphere to the earth) 5) An aquarium owner, on a rather cold day. Put a heater in his aquarium, which made the water warm, but not hot. He thought the fish would like that. However, all his fish died. What could be the reason for this?
Answers
2.a yes, it is good as tree gives oxygen in the day time .
2.b.no,bcoz trees release co2 during nyt.
3.bcoz in such areas ozone layer is depleted thus recieves direct sunlight with UV radiations which cause skin cancer.
4.as we move upwards the gravitional forces decreases.thus the wight of molecules are lesser at high altitude,This also decreases the gas pressre at higher altiyude.
5.as the water temperature rises,the oxygen dissolved in water evaporates thus due to defficiency of oxygen.the fishes dies.
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Here's the answer:-
1.Yes,when we take out the cold water bottle from the freezer we see bubbles around the water bottle which shows the presence of water vapour in the air.
2i.Yes because that time plants/trees release oxygen which is good for our respiratory system.
2ii.No because that time trees/plants release carbon dioxide which is harmful for our respiratory system.
3.One possible cause of this is the ultraviolet rays.
4.Air becomes thinner higher up because the earth pulls everything in its centre which is known as gravitational force.So,the air is thinner higher up.
5.As the heater is present in the aquarium,the oxygen that was dissolved in the water escapes in the form of bubbles.As the oxygen escapes from the aquarium,the fishes can't breathe and so the died.