Paheli went to the market to buy sarees for her mother. She
took out a thread from the edge of the two sarees shown by the
shopkeeper and burnt them. One thread burnt with a smell of
burning hair and the other burnt with the smell of burning
paper. Which thread is from a pure cotton saree and which
one from a pure silk saree? Give reason for your answer.
Complete the paragraph related to the life history of silk moth
by filling in the blanks.
The ____(a)___ silk moth lays ___(b)___, from which hatch
____(c)___ called ___(d)____ or ___(e)____. They grow in size and
when the caterpillar is ready to enter the next stage of its life
history called ___(f)____, it first weaves a covering to hold itself,
which is known as ___(g)____.
When you move into the ocean what thermal layers would you encounter?
Why the temperature varies with depth?
Which one of the following does not follow monoculture?
(a) Dairy farming
(c)
Plantation agriculture
(b) Mixed farming
(d)
Commercial grain farming
Steps for the production of silk are given below in a jumbled
order. Arrange them in their proper sequence.
(a) Eggs are warmed to a suitable temperature for the larvae
to hatch from eggs.
(b) Fibers are taken out from the cocoon.
(c) After 25 to 30 days, the caterpillars stop eating and start
spinning cocoons.
(d) The larvae/caterpillars or silkworms are kept in clean
trays along with freshly chopped mulberry leaves.
(e) Female silk moths lay eggs.
(f) Cocoons are kept under the sun or boiled in water.
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