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Yogita Ingle 5 years, 4 months ago
The force of attraction between any two bodies is directly proportional to the product of their masses and is inversely proportional to the square of the distance between them.
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Rajesh Sommanek 5 years, 4 months ago
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Yogita Ingle 5 years, 4 months ago
Microorganisms are friendly as well as harmful.
Friendly Microorganisms:
Microorganisms are used for various purposes by human beings as well as in nature. Some of the beneficial effects of microorganisms are as follows:
i. Microorganisms are used in the production of alcohol, wine and acetic acid.
ii. They are used in making curd, bread and cake.
iii. They are used in the preparation of medicines called antibiotics.
iv. They are used in agriculture to increase the fertility of soil by fixing atmospheric nitrogen gas.
v.They clean up the environment by decomposing the organic matter of dead plants, dead animals and animal wastes into harmless and useful simple substances.
Esha Badhan 5 years, 4 months ago
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Foram Mandali 5 years, 4 months ago
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Dhwani Patel 5 years, 4 months ago
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Meghna Thapar 5 years, 2 months ago
- Forces are used in everyday actions like pushing, pulling, lifting, stretching, twisting and pressing.
- An interaction of one object with another object results in a force between the two objects.
- A force on an object may change its shape.
- It is the muscular force that enables us to perform all activities involving movement or bending of our body.
- Frictional force is an example of a contact force.
- Electrostatic force is an example of non-contact force.
- All the gases exert pressure.
- Atmospheric pressure is due to the weight of air present in the atmosphere above us.
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Foram Mandali 5 years, 4 months ago
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Yogita Ingle 5 years, 4 months ago
Crop production is a process in which a varieties of crops are grown for multiplication under various types of methods like natural farming , organic farming or conventional farming.
Posted by Bikash Preety Wedding 5 years, 4 months ago
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Posted by Nandini Singh 5 years, 4 months ago
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Yogita Ingle 5 years, 4 months ago
A living organism that is very minute to be seen by the naked eye, especially a single celled organism, such as a bacterium is called microorganism. Microorganisms are classified into four major groups mainly bacteria, fungi, protozoa and some algae.
Posted by Nitin Nandal 5 years, 4 months ago
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Meghna Thapar 5 years, 3 months ago
Metals have a high tensile strength because the bonds between the atoms are strong. The metallic bond binds all the atoms into a giant structure which means that there are few weak spots. They share electrons with each other. For example: Iron is used to make cars and bridges because it is hard, with a high tensile strength. Copper is used to make electrical wiring because it is a good conductor of electricity.
Posted by Pallavi Verma 5 years, 4 months ago
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Foram Mandali 5 years, 4 months ago
Neha Kathayat 5 years, 4 months ago
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Yogita Ingle 5 years, 4 months ago
Properties of Plastic
- Strong and ductile
- Poor conductors of heat and electricity
- Easily molded into different shape and size
- Resist corrosion and are resistant to many chemicals.
Posted by Lakshay Goyal 5 years, 4 months ago
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Yogita Ingle 5 years, 4 months ago
The distance between seed is important because if seeds are not sown at proper distance there will be a competition between the plants for consuming sunlight,water and space which leads to the improper growth of plants and also damages the whole crop.
Posted by Madhav Sharma 5 years, 4 months ago
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Yogita Ingle 5 years, 4 months ago
Nitrogen cycle is all about the movement of nitrogen between various elements on Earth (like air, soil, living organisms etc.) The amount of nitrogen in the atmosphere remains constant.
- Atmosphere has approx. 78% nitrogen.
- Atmospheric Nitrogen is fixed into the soil
- N2 fixing microbes convert atm. N2 into nitrogen compounds like NH3
- Plants utilize nitrogen from soil through their roots
- Animals utilize nitrogen, feeding on plants
- When Plants & animals die, Nitrogenous wastes are returned to soil
- Decomposers convert some part to nitrogen compounds to be used by plants
- Denitrifying bacteria convert into atm. N2
Posted by Madhav Sharma 5 years, 4 months ago
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Meghna Thapar 5 years, 3 months ago
- Nitrogen Cycle:
The circulation of nitrogen element through living things and non-living environment is called nitrogen cycle in nature. The main steps involved in nitrogen cycle are:
- The nitrogen fixing bacteria present in the soil and in the root nodules of leguminous plants, blue-green algae and lightning in the sky fix atmospheric nitrogen and convert it into compounds of nitrogen which go into the soil.
- The roots of the plants absorb compounds of nitrogen from the soil for their growth and convert them into plant proteins and other organic compounds which make up the body of the plants.
- The plants are eaten up by animals as food. Animals convert plant proteins into animal proteins and other organic compounds which make up their body.
- When plants and animals die the complex nitrogen compounds present in their dead bodies are decomposed and converted into simple compounds of nitrogen by certain bacteria and fungi present in the soil.
- Certain bacteria convert some part of nitrogen compounds into atmospheric nitrogen which goes back into the atmosphere and thus the amount of nitrogen content remains more or less constant.
Posted by Rakesh Kumar 5 years, 4 months ago
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