Question
State true or false: Silk fiber is obtained from the cocoon of a silkworm.
- True
- False
Hint:
The rearing of silkworms is known as sericulture.
The correct answer is 'True'.
The statement "Silk fiber is obtained from the cocoon of a silkworm".
Cocoon is made by the pupa when it is undergoing metamorphosis to become an adult. The cocoon is made up of one fine thread of silk.
The cocoons are collected and stored in the sun or boiled or steamed. This helps separate the silk fibers. The process of separating the silk thread from the cocoon is called silk winding. The silk fibers are then spun into yarn. The resulting silk thread is woven into the desired garment.
Sericulture has two steps:
- Care of silkworms from the egg stage to the completion of the cocoon.
- Production of mulberry trees that provide leaves for earthworms to feed on.
Related Questions to study
Select a biodegradable material from the following.
The correct option is d)Paper.
- "Biodegradability" refers to the ability of a substance to break down (break down) biologically (with or without oxygen) by the action of microorganisms such as bacteria and fungi while being absorbed into the natural environment.
- No ecological damage occurs during the process.
- Paper is biodegradable because it is made from plants, and most plant materials are biodegradable.
- Paper is easily recycled and is considered more environmentally friendly than plastic as it can be recycled 6-7 times before its fibers are too short to be used in papermaking.
Select a biodegradable material from the following.
The correct option is d)Paper.
- "Biodegradability" refers to the ability of a substance to break down (break down) biologically (with or without oxygen) by the action of microorganisms such as bacteria and fungi while being absorbed into the natural environment.
- No ecological damage occurs during the process.
- Paper is biodegradable because it is made from plants, and most plant materials are biodegradable.
- Paper is easily recycled and is considered more environmentally friendly than plastic as it can be recycled 6-7 times before its fibers are too short to be used in papermaking.
Select the correct option for the characteristics of the polymer.
The correct option is c)High elongation.
The combination of high tear strength and high elongation results in a material with high toughness. Elongation at break measures how much bending or deformation a material can withstand without breaking. The measured elongation at break values indicate the ductility of the polymer.
Select the correct option for the characteristics of the polymer.
The correct option is c)High elongation.
The combination of high tear strength and high elongation results in a material with high toughness. Elongation at break measures how much bending or deformation a material can withstand without breaking. The measured elongation at break values indicate the ductility of the polymer.
Woollen clothes made up of wool are obtained from
The correct option is c)sheep.
Wool, an animal fiber that forms the protective covering or fleece of hairy mammals such as sheep, goats and camels. Prehistoric humans who wore sheepskin eventually learned to make threads and cloth from the fiber-covered material, which formed a protective outer layer due to selective breeding of sheep. Most of the long, coarse hair has been removed, leaving behind an insulating, fluffy undercoat made up of soft, fine fibers.
Wool is primarily obtained by shearing the fleece of live animals, but the fur of slaughtered sheep is sometimes treated to loosen the fibers, creating an inferior type called drawn wool.
Woollen clothes made up of wool are obtained from
The correct option is c)sheep.
Wool, an animal fiber that forms the protective covering or fleece of hairy mammals such as sheep, goats and camels. Prehistoric humans who wore sheepskin eventually learned to make threads and cloth from the fiber-covered material, which formed a protective outer layer due to selective breeding of sheep. Most of the long, coarse hair has been removed, leaving behind an insulating, fluffy undercoat made up of soft, fine fibers.
Wool is primarily obtained by shearing the fleece of live animals, but the fur of slaughtered sheep is sometimes treated to loosen the fibers, creating an inferior type called drawn wool.
