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Yogita Ingle 6 years, 6 months ago
An electric bulb is a device which produces light when electricity is passed through its terminals.
- The bulb has two thick contact wires in the center with a thin wire attached between them. This thin wire is called filament.
- One of the thick wires is connected to the metal case at the base of the bulb and the other is connected to the metal tip at the center of the base. These two form the terminals.
- When electricity is passed through the terminals of the bulb, the filament gets heated up and produces light.
- A bulb is said to be fused if the filament gets broken. Fused bulb doesn’t glow.
- The two terminals do not directly touch each other to avoid short circuit.
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Yogita Ingle 6 years, 6 months ago
Roughage is a type of undigestive food fibre which is good for our digestive system.
Main function is to add bulk to the diet, which in turn helps in the digestion process and healthy function of the bowel system.
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Sia ? 6 years, 6 months ago
The utility of honey is as follows:
- Honey is a food of high nutritive value. It also helps in the growth of our body as it contains iron and calcium.
- Honey has great importance for its medicinal value especially in disorders related to digestion, dysentery, vomiting and stomach, and liver ailments.
- Beeswax is used in the preparation of cosmetics and polishes of various kinds etc.
- It is also used as a source of sugar in confectionary items.
Posted by Devika Mehrotra 6 years, 6 months ago
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Yogita Ingle 6 years, 6 months ago
Common uses of magnets include the compass, vending machines, refrigerator magnets and electric motors.
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Yogita Ingle 6 years, 6 months ago
The female silk moth lays eggs. The larvae also known as caterpillar or silkworm hatches out from the egg and grows in size. As soon as the caterpillar gets ready to develop into pupa, it first weaves a net to hold itself and swings its head from side to side.
During these movements the caterpillar secretes fibre made of a protein that hardens on exposure to air and becomes silk fibre. The caterpillar soon covers itself completely by a covering of silk fibres known as cocoon. The further development of the moth continues inside the cocoon. Silk fibres are used for weaving silk cloth.
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The characteristics include growth, metabolism, reproduction, self-organize, self-replicate, interact, ability to sense and react are some very essential features of living things/organisms.
Posted by Hemlata Gurjar 6 years, 6 months ago
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Yogita Ingle 6 years, 6 months ago
The surrounding in which a living being lives is called its habitat. For example; the pond is the habitat for a frog. Our home is our habitat. A tree is the habitat for a squirrel.
Types of Habitat: There are two main types of habitat, viz. terrestrial habitat and aquatic habitat.
- Terrestrial Habitat: The habitat on land is called terrestrial habitat. The terrestrial habitat can be further categorized as forests, grasslands, coastal, mountain and desert habitats.
- Aquatic Habitat: The habitat in water is called aquatic habitat. The aquatic habitat can be further categorized as ocean, rivers, lakes, ponds and swamps.
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The process of making yarn from fibres is called spinning. In this process, fibres from a mass of cotton wool are drawn out and twisted. This brings the fibres together to form yarn.
A simple device used for spinning is a hand spindle also called takli.
Another hand operated device used for spinning is charkha.
Spinning of yarn on a large scale is done with the help of spinning machines.
Posted by Durlov Dutta 6 years, 6 months ago
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Sia ? 6 years, 6 months ago
Winnowing is the process of separating wheat or rice grains from the husk. Wheat grains and husk are different in weight, husk being lighter than wheat. When the mixture is allowed to fall down from a height the wind carries the lighter husk with it and the heavy wheat grains fall vertically down on the ground.
Posted by Madhuri Patil 6 years, 6 months ago
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Yogita Ingle 6 years, 5 months ago
Dietary fiber or roughage is the indigestible portion of food derived from plants. It has two main components:
- Soluble fiber, which dissolves in water, is readily fermented in the colon into gases and physiologically active byproducts, and can be prebiotic and viscous. This delays gastric emptying which, in humans, can result in an extended feeling of fullness.
- Insoluble fiber, which does not dissolve in water, is metabolically inert and provides bulking, or it can be fermented in the large intestine. Bulking fibers absorb water as they move through the digestive system, easing defecation.
Posted by Purushottam Reddy 6 years, 6 months ago
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