Question

Chemically, the silk is?
A) Cellulose
B) Resin
C) Protein
D) Lipid

Answer 1

Hint Silk is made from insects. It is a material for nests and cocoons of insects. Many insects produce silk for example- silkworm, beetles, honeybees, bumble bees, hornets, weaver ants, and many others. From these the most common type of silk is formed by silkworms.
Complete Step-by-step answer:

Silk is a natural fibre produced by insects. Silk is a very lustrous and tough elastic fibre that is produced by silkworms. Moreover, it is a natural protein fibre. The protein fibre of silk is formed mainly from fibroin. Silk is produced by insect larvae to form cocoons for themselves. Some types of silk can be woven into textiles.
Mulberry silkworm produces the best-known silk from the cocoons of the larvae. Bombyx mori is reared in captivity. Silk can be used for textiles. In making a thread, yarn or one can make garments from silk and fabrics made up of silk filaments.
Cellulose is present in plants. It is a polymer that occurs naturally. It consists of repeating units of glucose. It is obtained from wood pulp or the short fibres (linters) which adhere to cotton seeds.
Resins are produced in special resin cells in plants and are also produced when there is an injury to the plants. It can be produced by the bark of a tree, flowers of herb, and buds of the shrub.
Lipids are chains of fatty acids and glycerols. Lipids are a major component of biological membranes and are used as a compact energy source.
Hence the correct answer is option D.
Note: Mostly silkworms feed on mulberry leaves and castor. There are different species of silkworms that feed on the leaves of distinct plants. Non-mulberry silkworms survive on the plants like castor, oak, som, juniper, pine, etc.