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Sonali Aggarwal 7 years, 4 months ago
The process of seperating grain from chaff and hay with the help of wind is called winnowing.
Posted by Mehar Ahlawat 7 years, 4 months ago
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Meghna Thapar 5 years, 6 months ago
Saprotrophs: Those non-green plants which obtain food from dead or decaying organic matter are called saprotrophs. The saprophytic plants secrete digestive juices on the dead and decaying organic matter and convert it into a solution. They absorb the nutrients from this solution. For e.g. fungi such as mushrooms, bread mould and yeast.
Posted by Sushant Sharma 7 years, 4 months ago
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Yogita Ingle 7 years, 4 months ago
Extracting silk from the cocoon is called processing silk.
The first step is to separate the silk fibre from the cocoon. For this, they need to be exposed to warmth.
Piles of cocoons are kept under the sun, boiled or exposed to steam. The warmth causes the silk fibre to separate from the rest of the cocoon.
The next step is called reeling the silk, which is the process of delicately unwinding the fibre from the cocoon.
Reeling is also done in special machines.
The silk thread is then bleached and dyed into many shades.
The silk fibre is then spun into silk thread, which is then woven into silk cloth by weavers.
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Meghna Thapar 5 years, 6 months ago
- Chloroplasts are green coloured organelles present in the cytoplasm of plant cells. It contains chlorophyll which helps in photosynthesis.
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Meghna Thapar 5 years, 6 months ago
Amoeba is a unicellular, microscopic organism which lives in pond water. It has a cell membrane, a round and dense nucleus, and many bubble-like vacuoles in the cytoplasm. It eats tiny plants and animals present in pond water. The body of Amoeba has finger-like projections called pseudopodia which ingests the food. When a food particle comes near Amoeba, the pseudopodia surrounds the food particles and trap the food with a little water forming a food vacuole inside its body. The surrounding cytoplasm secretes digestive enzymes into the food vacuole which acts on the food and thus it gets digested and absorbed directly into the cytoplasm by the process of diffusion. The absorbed food is used for the production of energy which is used for maintenance and growth of Amoeba. The undigested food collects inside Amoeba, near the cell membrane which gets ruptured to throw the undigested food.
Posted by Prachi Jain 7 years, 4 months ago
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Meghna Thapar 5 years, 6 months ago
From fibres to wool:
To obtain wool sheep are reared. Their hair is cut and processed into wool. Sheep are herbivores and prefer grass and leaves. They also eat mixture of pulses, corn, jowar, oil cakes and minerals. In winters sheep are kept indoors and fed on leaves grain and dry fodder.
Processing fibres into wool:
The wool which is used for knitting sweaters and weaving shawls involves following steps:
- 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. The hair provides woolen fibres and than are processed to obtain woolen yarn. Shearing does not hurt the sheep as the upper most layer of skin is dead.
- 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. The scoured fleece is then dried.
- 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. The same quality wool obtained from the fleece of large number of sheep is than mixed together.
- 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.
- Combing: This is a process of preparing woolen fibres for spinning the yarn. It is done by using combs having metal teeth.
- Spinning: The long woolen fibres are spun into thick yarn called wool.
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Yogita Ingle 7 years, 4 months ago
Buccal cavity is the inner region of the mouth. It encloses teeth and tongue. The buccal cavity leads into pharynx. Salivary glands are present inside the buccal cavity. They secrete saliva. Saliva helps in lubrication of food . This saliva plays an important role in breaking down complex components like starch into simple sugars. It brings about partial digestion of starch. Digestive juices are secreted in the buccal cavity, stomach, and small intestine.
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Avneet Avneet 7 years, 4 months ago
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