Waste materials should be always separated into recyclable and non-recyclable materials before disposal. This is done so that non-recyclable materials can be disposed appropriately and recyclable materials can be reused.

The blue dustbin is for materials like plastics, metals and glass, which can be reused. These material are generally very hard to dispose of. It saves much more time and energy to reuse them.

Kitchen wastes are rich in organic components and helps in making of manure.

There are two colours of dustbins provided by municipalities - blue for non-biodegradable waste and green for biodegradable waste. 

Statement: 1 Mark
Solution: 1 Mark
No, because the burning of leaves produces harmful gases and pollute our environment.
Garbage heaps of dried leaves should be converted into useful compost.

Definition of useful garbage: 1 Mark
Examples of useful garbage: 1 Mark
Useful garbage components are those that can be decayed easily. The process of decaying is known as composting.
Useful garbage components are
(any two):
1. Fruit and vegetable wastes,
2. Plant and animal wastes,
3. Tea leaves,
4. Coffee grounds,
5. Paper. 
These are useful because they are converted into manure in the soil.

The waste accumulated in our surroundings to be disposed off is called as garbage. Garbage includes domestic wastes, municipal wastes, and industrial wastes.

Methods: 1 Mark each
Wastes can be decomposed and converted into organic manure by different processes. - composting, vermicomposting and landfills.
1. Composting involves the conversion of biodegradable wastes into organic manure by burying them in compost pits. These wastes are decomposed by the action of bacteria and fungi. It is a slow, simple and cheap process. It causes no harm to the environment.