explain about metamorphosis process in 150 words.??
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Answer:
Metamorphosis is a biological process by which an animal physically developed after birth. Animals can be divided into species that undergo complete metamorphosis and in insects metamorphosis is controlled by hormones synthesized by endocrine glands. Metamorphosis has four stage in insects Egg, larva, pupa and adult.
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Answer:
Silk moth is an insect from which silk is obtained. The larva or caterpillar of silk moth is called silk worm that are used to produce silk.
When a female moth lays eggs on the mulberry leaves, after sometime, these eggs hatch into larvae. Larva is the vegetative stage where growth takes place and it molts 4 times. The period between the different molts is called an instar. This larva produces silk worm, upon hatching, which feeds on leaves of mulberry trees.
The next stage in the life cycle of a silkworm is a pupa . When the caterpillar has grown large enough and is ready to go to the stage of pupa, it starts weaving a net around itself to hold itself. Then, it moves its head from one side to another, making a figure eight (8). During these movements, caterpillars secrete a fibre made of protein, which solidifies and hardens when exposed to air for some time. This is the silk fibre . Caterpillars continue to spin silk fibre till they completely get covered by these fibres. This silk covering in which a silkworm covers itself is known as a cocoon . Further development of the silkworm takes place inside the cocoon, and it enters the pupa stage. After sometime, the pupa enters into the adult stage and emerges out of the cocoon as a moth. The whole process thus continues and is known as the life cycle of a silkworm.