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Yogita Ingle 6 years, 1 month ago
Lightning is an electric discharge in the atmosphere between oppositely charged clouds (or between charged cloud and the earth). Lightning is produced by the electric charges in the sky.
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Yogita Ingle 6 years, 1 month ago
No. Pure water does not conduct electricity. This is because pure water is devoid of any salts. Pure water can conduct electricity when a pinch of common salt is added to it as salt solution is conducting in nature.
Posted by Himani Shrivastav 6 years, 1 month ago
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Yogita Ingle 6 years, 1 month ago
The sources of noise pollution are as follows:
1) Televisions running at high volumes.
2) Use of Loudspeakers in religious or other functions.
3) Use of crackers.
4) Horns of buses, cars and trucks
Posted by Bhawna Sahu 6 years, 1 month ago
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Yogita Ingle 6 years, 1 month ago
Tap Water has salts and other impurities like iron etc. Impurities act as a good conductor of electricity.
Thus tap water is a good conductor.
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Posted by Ayush Singh 6 years, 1 month ago
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Yogita Ingle 6 years, 1 month ago
Endemic Species: Those species of plants arid animals which are found exclusively in a particular area are called endemic species to a zone, a state or a country. For example, sal and wild mango endemic flora of the Pachmarhi Biosphere Reserve.
Posted by Akshat Bahuguna 6 years, 1 month ago
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Yogita Ingle 6 years, 1 month ago
Feedback mechanism is the mechanism of the body to maintain the levels of hormones in the body in the desired limits. An increase or decrease in the levels of the hormones triggers the feedback mechanism.
The body has two types of feedback mechanisms, positive and negative feedback mechanism.
Example:
Negative feedback mechanism:
Whenever there is a change in the normal state, the messages are sent to ‘increase’ secretions if there is a fall below normal or to ‘decrease’ secretions if there is a rise above normal to restore the normal body state. Such a mechanism is called a negative feedback mechanism.
The increase in the blood sugar level stimulates the secretion of insulin so that the sugar level is maintained. If the blood sugar level falls below normal, then it stimulates the secretion of glucagon. Glucagon stimulates the breakdown of glycogen to glucose, and thus, the normal sugar level is maintained.
Posted by Aromal.Ak Aromal.Ak 6 years, 1 month ago
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Chhavi Tewari 6 years, 1 month ago
Posted by Ashok Lata 6 years, 1 month ago
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Meghna Thapar 6 years, 1 month ago
- A growth movement of a plant part in response to an external stimulus in which the direction of the stimulus determines the direction of response is called tropic movement.
Posted by Abhishek Mishra 6 years, 1 month ago
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Meghna Thapar 6 years, 1 month ago
- The production of new organism from a single parent without the involvement of *** cells is called asexual reproduction whereas the production of a new organism from two parents by making use of their *** cells is called sexual reproduction.
Posted by Supraja Vijendran 6 years, 1 month ago
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Meghna Thapar 6 years, 1 month ago
The chemical decomposition produced by passing an electric current through a conducting liquid is called electrolysis.
Take out carbon rods carefully from two discarded cells. Clean their metal caps with sand paper. Wrap copper wires around the metal caps of the carbon rods and join them to a battery. These two rods are electrodes.
Now, pour a cupful of water in a glass/plastic bowl and add a teaspoonful of salt or a few drops of lemon juice to water to make it more conducting. Immerse the electrodes in this solution. Make sure that the metal caps of the carbon rods are outside the water. Wait for 3-4 minutes. We will see that the bubbles of gases are produced at the two carbon electrodes. The formation of gas bubbles at the two carbon electrodes shows that a chemical change has taken place in water on passing electric current through it.
Posted by Rajesh Kumar Rawat 6 years, 1 month ago
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Meghna Thapar 6 years, 1 month ago
Increased level of nutrient in the water bodies leads to algal bloom. The algae compete for space, food and oxygen and thus affects the survival of aquatic organism. Aquatic organisms may also die due to starvation and lack of oxygen supply.
Posted by Harsh Kumar Singh 6 years, 1 month ago
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Meghna Thapar 6 years, 1 month ago
Mitosis is a type of cell division that results in two daughter cells each having the same number and kind of chromosomes as the parent nucleus, typical of ordinary tissue growth.
Posted by Sneha Bhardwaj 6 years, 1 month ago
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Yogita Ingle 6 years, 1 month ago
Non contact force
1.Non contact force is a force which on an object without coming physically in contact with.
2.The most familiar example of a non contact force is weight.
3.All four interactions are non contact forces.
Contact force
1. A contact force is a force applied to a body by another body.
2. Examples of contact forces are - Biological force, muscular force
3. Thus a contact force is a force that requires contact to occur.
Posted by Yash Das 6 years, 1 month ago
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Yogita Ingle 6 years, 1 month ago
- The flora and fauna of a region are the part of nature. They maintain a balance in the food chain of nature.
- Food chain is a sequence of transfer of energy from one organism to other. The food chain begins with autotrophs (producers) and ends with the consumption of the final energy by the heterotrophs (consumers).
- Plants that produce food by the process of photosynthesis are the autotrophs. The energy produced by the food produced by plants is taken up by the herbivores (animals that eat plants and plant products, eg. Deer, goat, etc.). The energy is then taken up by the carnivores (animals that eat other animals, eg. Tiger, lion, etc.) and omnivores (animal that eat both plants and animals, eg. Bear, human beings, etc.).
- In the absence of any one of these organisms the food chain will get disturbed and will affect rest of the organisms. Therefore it is necessary to take necessary initiatives to conserve the flora and fauna.
- In order to protect the flora and fauna of a region some protected area have been set up. the protected areas include national parks, biosphere reserves, wildlife sanctuaries.
- Any sort of heinious act against nature is prohibited here like killing an poaching of animals, feeling of trees. They don’t even allow grazing, plantation, cultivation, etc.
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Meghna Thapar 6 years, 1 month ago
- A smooth oval head - The head of a normally formed sperm has a smooth surface and resembles the shape of an egg.
- The head of the sperm measures 2.5 to 3.5 um in diameter and 4.0 to 5.5 um in length (um=micrometers).
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