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Sia ? 6 years, 7 months ago
Rearing of silk worm :-
Silkmoth is a large, white insect. It lays hundreds of eggs which are stored at a suitable temperature. Eggs hatch to produce larvae which are called caterpillar or silkworm. Caterpillar eats and grow and secrets a liquid. Liquids hardens on coming in contact with air and changes into a fine protein thread. Caterpillars cover itself with these fibres and form cocoon.
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Meghna Thapar 5 years, 10 months ago
Processing fibres into wool:
The wool which is used for knitting sweaters and weaving shawls involves following steps:
i. Shearing: The process of removing hair from the body of a sheep in the form of fleece is called shearing. Usually the hairs are removed during the hot weather which enables sheep to survive without their protective coat of hair.
ii. Scouring: The process of washing the fleece that removes dust, dirt, dried sweat and grease is called scouring. This process makes the fleece of sheep clean.
iii. Sorting: The process of separating the fleece of a sheep into sections according to the quality of woolen fibres is called sorting. The hairy skin is sent to a factory where hair of different textures is sorted.
iv. Dyeing: The hair of sheep is white, brown, or black in color. The white woolen fibres obtained by sorting can be dyed in different colors.
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Meghna Thapar 5 years, 10 months ago
The magnitude of maximum disturbance in the medium on either side of the mean position is called the amplitude (A).
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Meghna Thapar 5 years, 10 months ago
A clinical thermometer consists of a long narrow uniform glass tube. It has a bulb at one end. This bulb contains mercury. Outside the bulb a small shining thread of mercury can be seen. Mercury is the only one in liquid state at room temperature. It's used in thermometers because it has high coefficient of expansion.
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Meghna Thapar 5 years, 10 months ago
Wool is the textile fiber obtained from sheep and other animals, including cashmere and mohair from goats, qiviut from muskoxen, from hide and fur clothing from bison, angora from rabbits, and other types of wool from camelids.
Posted by Vibha Jha 6 years, 7 months ago
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Meghna Thapar 5 years, 6 months ago
The doctor dips the thermometer in liquid before use. It is because it is a antiseptic . The doctor checks the temperature of patients suffering from fever. It may have germs. When heated, the molecules of the liquid in the thermometer move faster, causing them to get a little further apart. This results in movement up the thermometer. When cooled, the molecules of the liquid in the thermometer move slower, causing them to get a little closer together.
Posted by Palak Bisht 6 years, 7 months ago
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Meghna Thapar 5 years, 10 months ago
Digestion in human beings starts in the mouth. The mouth contains teeth, tongue and salivary glands. The teeth cut the food into small pieces, chew and grind it. The tongue mixes the food with saliva. The salivary glands secrete a watery liquid called saliva.
The slightly digested food goes into the food pipe or oesophagus by peristalsis. No digestion of food takes place in the oesophagus.
The slightly digested food reaches the stomach through oesophagus for further digestion where it is broken down into smaller pieces. The inner lining of the stomach secretes gastric juice which includes mucus, hydrochloric acid and digestive juices. Mucus protects the lining of the stomach from hydrochloric acid. Hydrochloric acid makes the medium in the stomach acidic to facilitate the digestion of proteins. The digestive juices break down the protein into simpler substances. Then the partially digested food goes into the small intestine.
The small intestine is a very long and narrow tube where complete digestion of food takes place. It receives secretions of liver, pancreas and its own walls. Liver secretes liquid called bile which helps in the digestion of fats and converts them into small droplets. Pancreas secretes pancreatic juice which breaks down fats into fatty acids and glycerol. Pancreatic juice also breaks down carbohydrates and proteins into simpler forms. The intestinal juice secreted by the walls of small intestine breaks down the carbohydrates into glucose, proteins into amino acids. Thus, the food gets completely digested in small intestine.
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Anshi Patel 6 years, 7 months ago
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