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Yogita Ingle 5 years, 7 months ago
- Photosynthesis is essential for the existence of all life on earth. It serves a crucial role in the food chain – the plants create their food using this process, thereby, forming the primary producers.
- Photosynthesis is also responsible for the production of oxygen – which is needed by most organisms for their survival.
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Yogita Ingle 5 years, 7 months ago
The refraction of light by the Earth’s atmosphere is known as atmospheric refraction. The earth’s atmosphere is not evenly distributed and is optically denser at the bottom while is rarer at the top. The velocity of light changes from layer to layer. The molecules of different gases and dust particles have different optical densities. When an object transmits light rays in the atmosphere, these light rays pass through the atmosphere having different air layers of different densities and get refracted by the atmosphere.
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Yogita Ingle 5 years, 7 months ago
BMI is used to determine a person's weight in regard to his height which as a result shows whether a person is underweight, has normal weight, is overweight or obese.
BMI = wight/(height)2
Following are the categories of BMI values:
1. Less than 18.5 = Underweight person
2. Between 18.5 - 24.9 = Normal weight person
3. Between 25 - 29.9 = Overweight person
4. 30 or greater then 30 = Obese person
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Yogita Ingle 5 years, 7 months ago
Once filled with food, the stomach grinds and churns the food to break it down into small particles. It then pushes the small particles of food into the first part of the small intestine, called the duodenum. The small intestine is where most of the digestion and absorption of our food takes place....
Posted by Anushka Negi 5 years, 7 months ago
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Yogita Ingle 5 years, 7 months ago
The Tyndall effect is scattering of light by particles in a colloid or particles in a fine suspension. It can be seen when the light passes through the colloids or turbid substances causing the light to scatter in multiple directions. Examples are:
- A blue iris in an eye is due to Tyndall scattering in a turbid layer in the iris.
- The Tyndall effect in opalescentglass: It appears blue from the side, but orange light shines through.
- Light being shined through milk. As milk is a collloid.
- On a day when the sky is overcast, the sunlight passes through the turbid layer of the clouds, resulting in scattered, diffuse light on the ground.
- Fog because it is a colloidal substance. When light hits a substance with scattered particles, it collides with the particles, causing the light to scatter in multiple directions.
- The tyndall effect can be observed when the sunlight passes through the canopy of a dense forest.
- This effect can also be seen when the sun sets as the sky changes color depending on how low the sun is and as a result how much atmosphere the sun's light must pass through.
- The blue colour of smoke coming out from a 2 stroke engine, or even a four stroke engine where the burnt engine oil provides the particles.
- The Tyndall Effect is also the reason why the sky blue.
Posted by Anushka Negi 5 years, 7 months ago
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Yogita Ingle 5 years, 7 months ago
Oxidation of food resulting in bad taste and bad smell is known as rancidity.
Ways to prevent rancidity are :
1)by adding antioxidants .
2)by refrigerating the food items.
3)by flushing the food with nitrogen gas.
4)by using air tight containers.
5)by vacuum packing.
Posted by Anushka Negi 5 years, 7 months ago
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Yogita Ingle 5 years, 7 months ago
Sometimes a person may suffer from both near sightedness and far-sightedness. Such people are advised to use bifocal lenses. Bifocal lenses consists of concave on the upper portion and convex on the lower portion.
Arjun Kashyap 5 years, 7 months ago
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Yogita Ingle 5 years, 7 months ago
Uses of convex lens are:
1) Convex lens is used in microscopes and magnifying glasses to subject all the light to a specific point.
2) Convex lens is used as a camera lens in cameras as they focus light for a clean picture.
3) Convex lens is used in the correction of hypermetropia.
Arjun Kashyap 5 years, 7 months ago
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Arjun Kashyap 5 years, 7 months ago
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Yogita Ingle 5 years, 7 months ago
Wheat: The crop requires 50-75 cm of annual rainfall equally distributed throughout the growing season, cool growing season and bright sunshine at the time of ripening. Two states which lead in the production of wheat are Punjab and Haryana.
Rice: Rice requires high temperature above 250C, high humidity and an annual rainfall above 100cm. West Bengal and Uttar Pradesh leads in the production of rice.
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Arjun Kashyap 5 years, 7 months ago
2Thank You