Chapter 18

........ is a biodegradable waste.

• Plastic

• Glass

• Metals

• Vegetable peels

........ is a non-biodegradable waste and packing of ...... in such bags can cause toxic substances to move into food and damage it.

(a)  

The three types of waste based on their ......... are solid waste, liquid waste and gaseous waste.

• origin

• description

• mass

• composition

............ plastic bags and turn it into something useful

The conversion of solid waste into manure is called .....

.......... are used for vermicomposting.

......... full grown trees are needed to make one tonne of paper.

• 15

• 16

• 17

• 12

Insist the shopkeeper to use ..... bag instead of ..... bag.

Old newspapers can be recycled to produce ....... paper

Compost is used as ......