Which of the following is a biodegradable polymer?

$PHBV$ is a biodegradable polymer of two monomers $X$ and $Y$. $X$ and $Y$ respectively are

The natural rubber is the polymer of

Which of the following polymers is used to manufacture shampoo bottles?

Which of the following polymers (trade name) is used to obtain paints?

Consider the Assertion and Reason given below.
Assertion $(A):$ Ethene polymerized in the presence of Ziegler-Natta catalyst at high temperature and pressure is used to make buckets and dustbins.
Reason $(R):$ High density polymers are closely packed and are chemically inert.
Choose the correct answer from the following: