Silk

Silk is a natural protein fiber, some forms of which can be __________ into textiles.

• stitched

• woven

• knitted

• crocheted

The protein fiber of silk is composed mainly of fibroin, and is __________ by certain insect larvae to form cocoons.

• produced

• manufactured

• invented

• offered

The best-known silk is obtained from the cocoons of the larvae of mulberry silkworm Bombyx mori, which is reared in __________.

• chains

• cell

• prison

• captivity

The shimmering appearance of silk is due to the triangular prism-like structure of the silk fibre, which __________ silk cloth to refract incoming light at different angles, thus producing different colours.

• encourages

• tempts

• allows

• forces

Silk is produced by several insects, but, over the years, only the silk of moth caterpillars has been used for textile __________,

• fabricating

• constructing

• assembling

• manufacturing

Silk is produced by several insects, but, over the years, only silk of moth caterpillars has been used for textile manufacturing, although there has been some __________ into other types of silk.

• scrutinising

• probing

• research

• interrogation

Silk is mainly produced by the larvae of insects undergoing _________ metamorphosis,

• complete

• entire

• thorough

• intense

Silk is mainly produced by the larvae of insects undergoing complete metamorphosis, but some insects such as webspinners and raspy crickets produce silk __________ their lives.

• through

• entirely

• completely

• throughout