Which of the following is not a natural polymer ?

The correct answer is (d). Plastic is not a natural polymer. It is a synthetic polymer, which means that it is made by humans. The other options, silk, cellulose, and rubber, are all natural polymers.

• Silk is a natural protein fiber that is produced by silkworms. It is used to make a variety of products, including clothing, bedding, and upholstery.
• Cellulose is a natural polysaccharide that is found in the cell walls of plants. It is the most abundant organic compound on Earth and is used to make a variety of products, including paper, textiles, and biofuels.
• Rubber is a natural polymer that is made from the sap of rubber trees. It is used to make a variety of products, including tires, shoes, and gloves.

Plastic is a synthetic polymer that is made from a variety of materials, including oil, natural gas, and coal. It is used to make a variety of products, including packaging, furniture, and toys.