Silksworms are interesting insects . Have you ever watch them ? What do you know about their life cycles ? You will be able to discover some really amazing things when making a study of silkworm’s life cycle . Similar to other insects , the first stage in silkworm’s life cycle is beginning its life in an egg . To create eggs , the adult moths mate with each other . After that , the female moth lays many tiny eggs on mulberry leaves . After ten to twelve days on a mulberry leaf , a tiny black caterpillar hatches out of the egg . It eats for twenty to thirty days , comsuming large amounts of mulberry leaves to grow bigger and bigger.
The caterpillar has to moult through four changes of skin . This proccess is called “Larva” . The next stage of silkworm’s life cycle is changing into pupa . The caterpillar spins a cocoon of silk thread around itself for protection , to permit the development of the pupa . The caterpillar will change into a pupa inside the cocoon . The cocoon takes about three days to be fully complete and is a similar size to a peanut shell . In this stage , people can unwind the silk thread from the cocoon to weave into clothes . The pupa emerges from the cocoon as a moth after ten to twelve days.
This is the last stage of silkworm’s life cycle . The adult moths mate with each other and the female moth will die after laying eggs . The amount of female moth’s eggs is more than 350 eggs . Its life cycle occurs once a year in the wild , but under scientific breeding it can occur up to three times in a year to create more silk thread . The female silkworm lays eggs and a new life cycle begins . Silkworm is not only interesting but also helpful insect . Let’s discover the amazing things of silkworm’s life cycle and know the proccess of making silk thread.
Outline : 1. 1st stage (Egg) : • Adult moths mate with each other • Female moth lays many tiny eggs 2. 2nd stage (Larva) : • Caterpillar hatches out of its egg • Caterpillar eats mulberry leaves and grows bigger • It goes through 4 changes of skin 3. 3rd stage (Pupa) : • Caterpillar spins a cocoon of silk thread around itself • Caterpillar changes into a pupa inside cocoon • People unwind silk thread from cocoon to weave into silk clothes 4. Final stage (Adult) : • Pupa changes into a moth • Moth emerges from cocoon • Adult moths mate with each other.