Question

egg sandwich
Q18. I) Write name of each developmental stage in life cycle of silk
Moth
II)Explain how silk thread is obtained from cocoons of silk moth?
III) Give reason of the following :-
a. You do not get hurt when you get a haircut.
b. Wool trap more air than cotton.​

Answer 1

silk is a natural fibre which comes from the cocoons of silkworms ,which are the larvae of the mulberry ,silk moth bombyx mori . Inside the cocoon ,the silkworm chamges into a pupa ,the stage between larvae and adult moths .after around two weeks ,the pupa emerges from the cocoon as an adult moth .

life cycle of silk moth

firstly adult moths mate together

then female moth lays eggs

then a caterpillar hatches out

it feeds on mulberry leaves

then it secrete out a thread like structure from its mouth and then it covers itself up with it

then it converts to a pupa

now the pupa is put into a boiling water to remove the thread

now we get the silk

1 we don't get hurt in a haircut because our hair are not alive they are b

made up of protien called keratin but if we pluck out a hair by roots it hurts as the grow from the skin

2wool has tiny are holes which are a bad conductor of air