Page 37 - Genius Kidz Prudence Learning Sc-8

5. Hold a debate in class on.

(a) “Plastic as an environment pollutant.”

(b) “Advantages and disadvantages of using plastic.

6. We have read that bacteria can act upon almost all the substances. So, can bacteria break down or
change the form of a plastic?

7. Very short answer type questions.

(a) What is a polywool?

(b) Which fibre has high tenacity and elasticity?

(c) What is a biodegradable substance?

(d) Which plastic is used to make non-stick cookware?

8. Short answer type questions.

(a) Write a note on Rayon.

(b) Write a note on thermoplastics.

(c) Give at least five uses and examples of non-biodegrable substances.

9. Long answer type questions.

(a) What are polymers? What is polymerization? Are synthetic fibres polymers, if yes? Explain their
types.

(b) Write a note on “Plastic is a polymer”.

(c) Explain different types of plastics highlighting their properties and uses.

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