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Now a days polythene bags are being used extensively causing harm to the environment and animals at a dangerous level. Polythene is non- biodegradable which is not destroyed by microorganism even in long duration. Some times animals consume polythene bags along with waste materials which adversely affect the digestive system of animals. They get accumulated in the body of animals because digestive enzymes do not affect polythene. Finally animals die before time. With the help of your teacher make an extensive survey on the effect of polythene on the health of animals do research on it. That is do systematic investigation into it and establish facts to reach new conclusions.

(d) All these

Recycling is not possible for Wood

(a) Recycling

There are three-R methods of disposal of the non-bio-degradable wastes. 

1. Reduce : It means to reduce the number/ amount of unuseful things like broken tin container, plastic bottles, container, broken earthen pots etc. These can be put into domestic use by growing flowers’ vegetables in them. The quantity of un-useful materials can be reduced by this way.

2. Reuse : It means use again and again. Separate such materials from domestics unuseful wastes, that can be used again. For example : Battery, metal utensils, iron-rods, broken containers, glass bottle, jute materials etc. can be used again for some other domestic works. 

3. Recycles : Plastic and glass wastes are sent to recycling factories after separating them from other unuseful wastes. In recycling factory new products are made during recycling. Some reagents are mixed to make new products. These materials (new products) are specially used to make bags. Packing bags, containers to store food materials safely.

1. decomposed 

2. waste/garbage 

3. liquid, gaseous 

4. decompose.

1. Solid wastes 

2. Liquid wastes 

3. Gaseous waste.

1. Paint 

2. Glass 

3. Metal pieces 

4. Plastic and polythene

1. Plant Leaves 

2. Peels of fruits and vegetables 

3. Waste paper 

4. Clothes etc.

1. Biodegradable wastes 

2. Non biodegradable wastes.

Smoke released from vehicles, Industries and factories is called gaseous waste.

1. Dirty water 

2. Oil 

3. Paint 

4. Sewage.

The manure (Khad) made from biodegradable substances like peels of fruits and vegetable, human excreta, cattle dung, plant leaves, grasses and other dead and decomposed materials is called compost. It is prepared by putting the biodegradable substances in a pit dug in a shady place.