Our environment, chapter-6, class-3, S.St.

1:- What is environment?
Ans:- Everything that surrounds us forms our environment. environment has both living things and non-living things.

2:- What does the environment consist of?
Ans:- Environment consists of living and non-living things.

3:- What happens to the waste we throw away everyday? 

Ans:- The waste we throw away everyday is two types. Some wasted too and decay while another types of waste like polythene do not decay and pollute environment.

4:- What is atmosphere?

Ans:- Our earth is surrounded by thin layer of air. This layer of  air is called atmosphere.

5:- What is the percentage of Nitrogen in atmosphere?

Ans:- 78%

6:- What is the percentage of oxygen?

Ans:- 21%

7:- Write three name of important gases that constitute environment.

Ans:- Nitrogen, Oxygen, Carbon dioxide 

8:- What is air pollution?

Ans:- 

16:-Tick the correct answer.

1. Which of the following is made up of living and non-living things

                a-  oxygen                                 b- moon                                           c-  environment

2.Bursting of crackers causes

                a-  air pollution                         b-  land pollution                             c-  Water pollution

3. These are responsible for water pollution.

                a-  Waste from factories released into water bodies
                b-  Smoke from factories                                     
                c-  Overuse of fertilisers

4.What type of bags harm the environment

                a- Paper                                      b- Jute                                              c- Polythene
5.Honking of vehicles causes
                a- land pollution                         b- Noise pollution                            c- Water pollution 

17 :-  Fill in the blanks using the given clues

fertilisers

ill

non-living

pesticides

concentration

plastic

1-A table is a  __________ thing.
2-Avoid using things made of __________.
3-The soil gets polluted when farmers use __________ and __________ excessively.
4-Drinking polluted water can make us___________.
5-Noise pollution can lead to lack of __________.