class 5 sst. Conserving our environment.

CONSERVING OUR ENVIRONMENT

A. Match the columns:

a) air pollution Paper and leaves

b) land pollution burning petrol c)water pollution fertilizers

d)biodegradable plastic

e) non biodegradable sewage from factories

B. Write true or false. If it is false correct the sentence and write it.

1. When you use a plastic bottle to store water in the refrigerator you are
   reusing the bottle
2. Trees take in oxygen and give out carbon dioxide.
3. When waste is not disposed properly, germs and disease spread.
4. Water pollution affects only plants living in the water.
5. Glass pieces found in the waste will rot over time.
6. Everything around us makes up our family.
7. Burning of fuels causes air pollution
8. Waste paper is non – bio degradable
9. Rotting of leaves can produce manure called fertilizer.

Clas 4. Our Water Wealth.

Ans1.Sea water cannot be used for drinking or irrigation as it contains salt.

Ans 2. Rivers are full of water during the monsoon months , so very often there are floods during these months . The extra water simply flows into the sea. On the other hand , many rivers dry up during the hot summer months causing shortage of water.

4. What is Hydroelectricity?
   Electricity generated from the force of water in a dam is called hydroelectricity.

Class 4 Our Mineral wealth

OUR Mineral Wealth

Q3.

Ans-- Iron and Steel Plants__ Jamshedpur and Bhillai.

Petroleum Refineries___ Assam and Gujarat.

Q5.

Ans. COAL-- Coal is mainly found in Jharkhand, Madhya Pradesh, Chattisgarh and West Bengal. It is an important fuel and source of energy. It is used to generate electricity, to run factories and as a domestic fuel.

Petroleum____ It is mainly found in Assam , Gujarat and Bombay High.

It is an important source of energy .

We get fuels like petrol , diesel, kerosene and cooking gas from petroleum.

We also get lubricants, plastics and cosmetics from it.

Q6

ans. Our mineral resources can be over very soon. So they need to be used carefully and not wasted.