Define the term
1. Germs- Tiny living things which cause diseases are called germs.
2. Garbage- The things that are useless and can be thrown away are called garbage.
Answer in one line
1. What is the atmosphere?
Ans. The blanket of air that surrounds the earth is known as an atmosphere.
2. Which gas is present in the largest amount in the atmosphere?
Ans. Nitrogen gas is present in the largest amount in the atmosphere.
3. What makes the air fresh?
Ans. Trees and plants make the air fresh.
Answer in short
1. Name some important gasses present in the atmosphere.
Ans. Some important gasses present are- nitrogen, oxygen, carbon dioxide, and many more.
2. Why should we use a handkerchief while sneezing?
Ans. We should use a handkerchief while sneezing to avoid spreading germs.
Answer in detail
1. How are plants and trees important for us?
Ans. i) Trees and plants take in carbon dioxide and give out oxygen which makes the air fresh.
ii) Fresh and clean air keeps us healthy.
2. What steps should we take to get fresh air?
Ans. To breathe in fresh air we should-
i) Plant more trees.
ii) Keep in-door plants.
iii) Do a regular morning walk.
iv) Construct well-ventilated houses.
3. Give three causes of air pollution.
Ans. Air gets polluted due to some activities like
i) Smoke from factories and vehicles.
ii) Burning of firecrackers.
iii) Burning of garbage and plastic bags.
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