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❍ Plastics are non- biodegradable and do not decompose for several years.

• The substances that can be decomposed by micro-organisms through natural processes are called Bio-degradable substances.

Example: peels of fruits and vegetables, left over food stuff, cotton cloth, paper etc,.

• The substances that cannot be decomposed by microorganisms in natural way are called Non bio-degradable substances.

Example: Plastics.

• Metals are non-biodegradable. when they are dumped on the earth, face a problem of landfill space and Dumping of these causes soil pollution. They are non degradable pollutants and persist in the environment.

• Reuse means that we should reuse the substances that do not harm our environment and it should be biodegradable.

Answers :

Wodden log - Biodegradable .

Plastic bag - Non biodegradable.

Gold Necklace - Non biodegradable.

Roasted chicken - Biodegradable.

Credit card - Non biodegradable.

Apple - Biodegradable.

Hence, Wodden log , roasted chicken and apple are biodegradable.

Extra Information:

Definitions:

Biodegradable:

Substances that can be broken into simplier substances by biological process are called biodegradable.

They are eco-friendly and do not pollute environment.

Examples : wool , paper ,cotton , leaves.

Non- biodegradable :

Substances that cannot be broken down into simpler substances by biological process are called non- biodegradable .

They are non eco-friendly as they pollute the environment.

Examples : DDT , polythene bags , plastics, etc.