Question

Among the materials listed below, ___A___ wastes are biodegradable while ___B___ are non-biodegradable.

Kitchen waste, plastic waste, human excreta, DDT, paper

• A. A - 2, B - 3
• B. A - 1, B - 4
• C. A - 3, B - 2
• D. A - 4, B - 1

Answer 1

The correct option is C A - 3, B - 2

Biodegradable materials are those that can be acted upon by living organisms such as decomposer microbes and broken down. They do not pose a major risk of environmental pollution.
Kitchen waste, human excreta and paper (mostly made from plant materials) are all biodegradable.

Non-biodegradable materials are those that can not be decomposed by microbial action. As they do not undergo degradation, they could remain on earth for several hundred years and lead to pollution of the environment.
DDT (a pesticide extensively used in agriculture) and plastics are non-biodegradable.