name and draw sketches of two stage in the life cycle of silkmoth which are directly related to production of silk
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1. Egg →2.First stage of larvae→3.Second stage of larvae→4.final stage of larvae→ 5.Pupa →6.Adult
The female silk moth lays eggs, from which hatch larvae which are called caterpillars or silkworms.
They grow in size and when the caterpillar is ready to enter the next stage of its life history called pupa, it first weaves a net to hold itself. Then it swings its head from the side to side and secrets fibre made of a protein which hardens on exposure to air and becomes silk fibre. Soon the caterpillar completely covers itself by silk fibres and turns into pupa. This covering is known as cocoon. The further development of the pupa into moth continues inside the cocoon.
The female silk moth lays eggs, from which hatch larvae which are called caterpillars or silkworms.
They grow in size and when the caterpillar is ready to enter the next stage of its life history called pupa, it first weaves a net to hold itself. Then it swings its head from the side to side and secrets fibre made of a protein which hardens on exposure to air and becomes silk fibre. Soon the caterpillar completely covers itself by silk fibres and turns into pupa. This covering is known as cocoon. The further development of the pupa into moth continues inside the cocoon.
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(a) Which parts of the black sheep have wool?
Answer : The black sheep in the poem seems to have wool on almost all the parts as it in the poem it offers wool, enough to fill three bags full.
(b) What is meant by the white fleece of the lamb?
Answer : Here the white fleece of the lamb refers to pure white woolen coat that it wears.
2. Question : he silkworm is (a) a caterpillar, (b) a larva. Choose the correct option.
(i) a (ii) b (iii) both a and b (iv) neither a nor b.
Answer : (iii) both a and b
3. Question : Which of the following does not yield wool?
(i) Yak (ii) Camel (iii) Goat (iv) Woolly dog
Answer : (iv) Woolly dog
4.Question : What is meant by the following terms?
(i) Rearing (ii) Shearing (iii) Sericulture
(i) Rearing : Rearing is raising livestock like goat, cows, sheep etc for commercial purpose by taking them out in herds for grazing , feeding them on a mixture of pulses, corn, jowar, oil cakes (material left after taking out oil from seeds) and minerals for better growth and yield of produce like meat, milk, wool. Beside this in extreme climatic condition like winter these are also provided shelter and fed on leaves, grain and dry fodder.
ii) Shearing: Shearing is the process in which fleece of the sheep along with a thin layer of skin is removed from its body. Machines similar to those used by barbers are used to shave off hair. Generally, the hair are removed during the hot weather which enables the sheep to survive without their protective coat of hair. The hair provide woolen fibres. Woolen fibres are then processed to obtain woolen yarn. Shearing does not hurt the sheep as the uppermost layer of the skin is dead..
(iii) Sericulture : Sericulture, or silk farming, is the rearing of silkworms for the production of raw silk.For obtaining silk, silk worm moths are reared and their cocoons are collected to get silk threads. Silk yarns come from the cocoon of the silkworm. The caterpillar hatches from a very small egg and is an eating machine. Their diet of continually eating mulberry leaves results in a semi-liquid protein called fibroin. When the silkworms start its spinning process in the cocoon, the worm's head is coated with a gummy protein called sericin. The silkworm rotates its body thousands of times extruding one continuous strand of silk the length of 12 football fields. The silk adheres to itself, forming the cocoon.
Answer : The black sheep in the poem seems to have wool on almost all the parts as it in the poem it offers wool, enough to fill three bags full.
(b) What is meant by the white fleece of the lamb?
Answer : Here the white fleece of the lamb refers to pure white woolen coat that it wears.
2. Question : he silkworm is (a) a caterpillar, (b) a larva. Choose the correct option.
(i) a (ii) b (iii) both a and b (iv) neither a nor b.
Answer : (iii) both a and b
3. Question : Which of the following does not yield wool?
(i) Yak (ii) Camel (iii) Goat (iv) Woolly dog
Answer : (iv) Woolly dog
4.Question : What is meant by the following terms?
(i) Rearing (ii) Shearing (iii) Sericulture
(i) Rearing : Rearing is raising livestock like goat, cows, sheep etc for commercial purpose by taking them out in herds for grazing , feeding them on a mixture of pulses, corn, jowar, oil cakes (material left after taking out oil from seeds) and minerals for better growth and yield of produce like meat, milk, wool. Beside this in extreme climatic condition like winter these are also provided shelter and fed on leaves, grain and dry fodder.
ii) Shearing: Shearing is the process in which fleece of the sheep along with a thin layer of skin is removed from its body. Machines similar to those used by barbers are used to shave off hair. Generally, the hair are removed during the hot weather which enables the sheep to survive without their protective coat of hair. The hair provide woolen fibres. Woolen fibres are then processed to obtain woolen yarn. Shearing does not hurt the sheep as the uppermost layer of the skin is dead..
(iii) Sericulture : Sericulture, or silk farming, is the rearing of silkworms for the production of raw silk.For obtaining silk, silk worm moths are reared and their cocoons are collected to get silk threads. Silk yarns come from the cocoon of the silkworm. The caterpillar hatches from a very small egg and is an eating machine. Their diet of continually eating mulberry leaves results in a semi-liquid protein called fibroin. When the silkworms start its spinning process in the cocoon, the worm's head is coated with a gummy protein called sericin. The silkworm rotates its body thousands of times extruding one continuous strand of silk the length of 12 football fields. The silk adheres to itself, forming the cocoon.
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