Multiple choice

Which of the following is not a non-biodegradable substance?

  1. Plastic bag

  2. Woollen clothes

  3. Tin

  4. Aluminium
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Biodegradable substances can be broken down by natural processes into simpler compounds. Woollen clothes are made from natural animal fibers (protein-based keratin) that decompose naturally. Plastic bags, tin, and aluminum are non-biodegradable - they persist in the environment for hundreds to thousands of years without breaking down naturally.

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