explain the life cycle of silkworm with diagram
Answers
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STAGE 1: Egg
An egg is the first stage of the life of the silk worm . The egg is lead by a female moth which is mostly the size of small dots. A female moth lay more then 350 eggs at a time. In the spring time the egg hatch due to the warmth in the air . This procedure happens in every one year.
STAGE 2: Silkworm
A hair silk worm raises after the egg crack. In this stage of silk worm 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, silkworm spin a protective cocoon around itself. It is the size of a small cotton ball and is made of a small thread of silk .
STAGE 4: Pupa
Pupa stage is a motionless stage. In this stage people kill the pupa by lunging 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 egg after mating and thus the life cycle of silk worm begins again.
Answer:
a) Egg stage: Characteristics of silkworm during egg stage are:
—It is white in color and its size is the size of pin head.
—300 eggs are laid at a time.
—An egg hatches into larvae under suitable condition i.e. 18c – 25c.
b) Larvae stage: Characteristics of silkworm during larvae stage are:
—This stage lasts for about a month.
—A newly formed larvae is brown in color and is 6 millimeters long.
—A larvae molts up to 4 times. After each moulting it lies inactive for about 20 to 24 hours.
—A matured larvae changes into a cocoon.
c) Pupae stage: Characteristics of a silkworm in pupae stage are:
—This stage lasts for 12-14 days.
—A pupae does not move or feed.
—Silk thread is extracted during this stage.
d) Adult stage: Characteristics of a silkworm during adult stage are:
—It has 3 pairs of legs and 2 pairs of wings.
—It lives for 5 to 7 days.
Explanation:
