Give reasons:
a) Sky appears blue.
b) Ozone layer in the atmosphere is important to us.
c) We should never breathe through our mouth.
d) One should not keep a burning angithi(coal stove) in a closed room
Answers
Answer:
a) Sunlight reaches Earth's atmosphere and is scattered in all directions by all the gases and particles in the air. Blue light is scattered more than the other colors because it travels as shorter, smaller waves. This is why we see a blue sky most of the time.
b) The ozone layer acts as a shield for life on Earth. Ozone is good at trapping a type of radiation called ultraviolet radiation, or UV light, which can penetrate organisms' protective layers, like skin, damaging DNA molecules in plants and animals.
c) There is some thought that mouth-breathers may not be getting all the oxygen they need, which can lead to fatigue and,in some situations may cause stress to the heart and lungs. In terms of dental health, breathing through the mouth can dry the oral cavity and lead to bad breath, gum disease and tooth decay.
d) We should not sleep in a closed room with a coal fire burning in it because in closed room , coal after utilising all oxygen start burning incompletely. This leads to release of poisonous gas which has no taste, smell, and colour and is called Carbon monoxide. ... This is called Carbon monoxide poisoning.
Explanation:
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