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Meghna Thapar 5 years, 7 months ago
Water-borne diseases – For example: Cholera, Infectious diseases can also spread through water. These occur when a stool from someone suffering from an infectious gut disease, such as cholera or amoebiasis, gets mixed with the drinking water used by people living nearby. The cholera-infested bacteria can enter new hosts through the water they drink and can cause disease in them.
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Meghna Thapar 5 years, 7 months ago
Plant -like organisms that do not contain chlorophyll are called fungi. Fungi may be unicellular (Yeast) or multicellular (Bread mould) and are found in warm and moist places. Fungi can be heterotrophic, saprophytic or parasitic in nutrition.
Examples: Yeast, Rhizopus (Bread mould), mushrooms, puffballs.
Posted by Abhinav Verma 5 years, 7 months ago
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Meghna Thapar 5 years, 7 months ago
If the egg in the female is not fertilised, then the thick lining of the uterus is not required and the uterus lining breaks down and comes out through the ****** in the form of blood and mucous. This is called menstruation.
Posted by Aniket Rawat 5 years, 7 months ago
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Meghna Thapar 5 years, 7 months ago
The process of depositing a thin layer of desired metal over a metal object with the help of electric current is called electroplating. The purpose of electroplating is to protect the metal objects from corrosion or to make the metal objects look more attractive. The metal objects are usually electroplated with chromium, tin, nickel, silver, gold or copper objects.
Take 250 ml of distilled water in a clean beaker and dissolve two teaspoon full of copper sulphate in it. This will give us a blue coloured copper solution. Add a few drops of dilute sulphuric acid to copper sulphate solution to make it more conducting. Take a copper plate and a door key made of iron. Clean copper plates and the iron key by rubbing it with sand paper. Now rinse them with water and dry them. Immerse the cleaned copper plate in copper sulphate solution in the beaker. Connect the copper plate to the positive terminal of a battery through a switch. This copper plate becomes the positive terminal. Immerse the cleaned iron key in copper sulphate solution and connect it to the negative terminal of the battery so that it becomes the negative electrode. Allow the current to pass for about 15 minutes. Now remove the electrodes from the solution and observe. We will find that the copper plate has dissolved a little and the iron key has got a reddish layer of copper metal all over its surface. Thus, the iron key has become electroplated with copper. The solution remains unchanged.
Posted by Aniket Rawat 5 years, 7 months ago
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Meghna Thapar 5 years, 7 months ago
The process of depositing a thin layer of desired metal over a metal object with the help of electric current is called electroplating. The purpose of electroplating is to protect the metal objects from corrosion or to make the metal objects look more attractive. The metal objects are usually electroplated with chromium, tin, nickel, silver, gold or copper objects.
Posted by Vivek Jaiswal 5 years, 7 months ago
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Meghna Thapar 5 years, 7 months ago
Viruses are considered at the borderline of living and non-living because they show both the characteristics of a living and a non-living. As they reacts like non-living in the free atmosphere but when they enter in the body of a living organism then they shows the features of a living organism and starts reproduction.
The features of being a living are that DNA and RNA codes are present in them.
Some special features of being a non-living are that they do some functions like excretion and can't multiply by own.
Posted by Devika Rajput 5 years, 7 months ago
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Meghna Thapar 5 years, 7 months ago
When air is contaminated by unwanted substances which have a harmful effect on both the living and the non-living, it is referred to as air pollution. The substances which contaminate the air are called air pollutants. Most of the air pollution is caused by the burning of fuels such as wood, cow-dung cakes, coal, etc. The various sources of air pollution are:
- Smoke emitted from the homes by the burning of fuels like wood, cow-dung cakes, kerosene and coal causes air pollution.
- Exhaust gases emitted by motor vehicles due to burning of petrol and diesel cause air pollution.
- Smoke emitted by factories and thermal power plants due to burning of coal causes air pollution. Some of the ways of controlling air pollution are given below:
- The air pollution can be controlled by using smokeless fuels like LPG and CNG.
- The air pollution from motor vehicles can be reduced by using CNG as a fuel.
Posted by Vaibhav Pathak 5 years, 7 months ago
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Meghna Thapar 5 years, 7 months ago
Cirrhosis is a late stage of scarring (fibrosis) of the liver caused by many forms of liver diseases and conditions, such as hepatitis and chronic alcoholism.
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Meghna Thapar 5 years, 7 months ago
Chlorofluoro carbons (CFCs) are used in refrigerators, air conditioners and aerosol sprays. CFCs damage the ozone layer of the atmosphere which protects us from harmful ultraviolet rays of the sun.
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Meghna Thapar 5 years, 6 months ago
A conduction tester is a device used to determine whether a substance is a good or poor conductor of electricity
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Meghna Thapar 5 years, 7 months ago
Disadvantages of Electroplating:
i. Non-uniform plating: electroplating may or may not be uniform and this may result in a substandard appearance of the plated material.
ii. Cost: the process is costly and time consuming.
Posted by Umasingh Uma 5 years, 7 months ago
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Meghna Thapar 5 years, 7 months ago
Disadvantages of Electroplating:
i. Non-uniform plating: electroplating may or may not be uniform and this may result in a substandard appearance of the plated material.
ii. Cost: the process is costly and time consuming.
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Meghna Thapar 5 years, 7 months ago
We should conserve forests and wildlife to preserve biodiversity, to prevent endangered species from becoming extinct and to maintain ecological balance in nature.
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Meghna Thapar 5 years, 7 months ago
The Golgi apparatus was first described by Camillo Golgi. Golgi apparatus consists of a set of membrane-bounded, fluid filled vesicles, vacuoles and flattened cisternae. Cisternae are usually stacked together (placed one above the other) in parallel rows. Golgi apparatus exists as an extensive network near the nucleus in the animal cells.
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Meghna Thapar 5 years, 7 months ago
A percussion instrument is a musical instrument that is sounded by being struck or scraped by a beater including attached or enclosed beaters or rattles struck, scraped or rubbed by hand or struck against another similar instrument.
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