8) Activity-based questions describe at least in 75 words with one
diagram related to the topic 5X3=15
1) Treatment of waste water
OR
What are the roles of bar screen, grit, and sand removal tank in the
treatment of waste water
2) About formation of a cyclone
OR
Show through an activity that warm air is lighter than cold air and warm air
rise up
3) Life history of a silk moth
OR
Processing of fiber into wool
Answers
Answer:
LIFE CYCLE OF SILK MOTH
Explanation:
Stage 1: Egg
An egg is the first stage of the life cycle of the silkworm. The egg is laid by a female moth which is mostly the size of small dots. A female moth lays more than 350 eggs at a time. In the springtime, the eggs hatch due to the warmth in the air. This procedure happens once in every year.
Stage 2: Silkworm
A hairy silkworm arises after the eggs crack. In this stage of silkworms, the growth happens. they feed on mulberry leaves and consume a large amount of these leaves for around 30 days before going to the next stage.
Stage 3: Cocoon
In this stage, silkworms spin a protective cocoon around itself. It is the size of a small cotton ball and is made of a single thread of silk.
Stage 4: Pupa
The pupa stage is a motionless stage. In this stage, people kill the pupa by plunging the cocoon into boiling water and unwind the silk thread.
Stage 5: Moth
In this stage, the pupa changes into an adult moth. The female moth lays eggs after mating and thus the life cycle of silkworm begins again.
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