a) Define moulting.
b) Name the two types of proteins present in silk.
c) Why does the silk shines?
Answers
Answer:
a) (used about an animal or a bird) to lose hairs or feathers before growing new ones
b) Silk is a fibre produced by the silkworm in production of its cocoon. It consists mainly of two proteins, fibroin and sericin.
C) Silk is also a protein like your hair, but it is special because the molecules stack in sheets like a long flat ribbon. These sheets stack together to form to make long triangular tubes. These triangular tubes act like prisms and reflect the light that hits them in many directions and make the silk shiny.
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Question :
Define moulting.
Answer :
the shedding or casting off of an outer layer or covering and the formation of its replacement. Molting, which is regulated by hormones, occurs throughout the animal kingdom.
Question :
Name the two types of proteins present in silk.
Answer:
Silk is a fibre produced by the silkworm in production of its cocoon. It consists mainly of two proteins, fibroin and sericin.
Question:
Why does the silk shines?
Answer:
The shimmering appearance of silk is due to the triangular prism-like structure of the silk fibre, which allows silk cloth to refract incoming light at different angles, thus producing different colors.
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