13. All the animals, including human beings, need oxygen to live. They all need this oxygen every
minute and second of their life. They take oxygen from the air through the process of breathing.
The oxygen, present in air is used to produce energy from the food that is eaten. In this process,
carbon dioxide gets formed, which is breathed out.
a) Name the gas which we need to live.
b) Name the source of energy in our body.
1
c) Can we live without breathing?
1
d) Name the gas which we breathe out during breathing.
14. We observe some bright and prominent stars on a clear night sky. Some of these stars appear to
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Answer:
answer a- oxygen and carbon dioxide is taken by trees .
food is the soure of energy
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