Organic manure is obtained from plants (agricultural waste, leaves, etc.) along with animals. Therefore, the statement 'only from animal materials' is incorrect.

The process of converting organic waste into manure with the help of earthworms is called 'Vermicomposting'.

Earthworms do not slow down the composting process, but rather accelerate it. Therefore, statement (3) is incorrect.

The '5R' principles for environmental conservation include Refuse, Reduce, Reuse, Repurpose, and Recycle.

Red worms are used in vermicomposting to make manure, as they quickly convert organic waste into compost.

All materials listed in option (1) can be naturally decomposed by microorganisms. Other options include non-biodegradable materials like plastic or glass.

The '3R' principle for environmental conservation stands for - Reduce, Reuse, and Recycle.

Metal cans and plastic bottles can be recycled. Medical and radioactive waste cannot be recycled; they require special disposal.

Cotton is a natural fiber obtained from plants, therefore it is biodegradable.

Vermicompost is prepared by the decomposition of organic matter by earthworms, hence it is environment-friendly.

Polythene is a synthetic polymer that is not decomposed by microorganisms, therefore it is a non-biodegradable waste.

Mango pulp has high water content and is soft, allowing microorganisms to decompose it faster compared to other hard parts (seeds, wood).

Earthworm manure or vermicompost is an excellent bio-fertilizer rich in nutrients. The earthworm is called the 'factory of natural manure' because it decomposes organic waste (like animal dung, leaves) with the help of earthworms to create compost.

Incineration is the most suitable method for the disposal of biomedical waste because it destroys hazardous waste by burning it at high temperatures.

Wood, leather, and fruit peels are natural organic materials that get decomposed by microorganisms, whereas plastic is non-biodegradable.

Plastic is a non-biodegradable material, which cannot be easily destroyed or decomposed by bacteria or other microorganisms.

According to the book, the average amount per person from small towns is 0.1 kg, while in large cities 0.4 to 0.6 kg of average waste is generated.

A pen drive is an electronic device (e-waste), syringes come from hospitals, plastic does not decompose easily, and vegetable peels are kitchen waste.

Eisenia fetida is a major exotic species used for vermicomposting.

Paint contains chemical compounds that are not easily decomposed by microorganisms, hence it is non-biodegradable.