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Gaurav Seth 5 years, 4 months ago
Soil is the thin layer of material covering the earth's surface and is formed from the weathering of rocks. Weathering is a process of physical breakdown and chemical decomposition of rocks and minerals near or at the surface of the earth. This physical and chemical decomposition is primarily done by wind, water, and climate. As a result of these processes, large rock pieces are converted into smaller particles .these small particles mix with humus (organic matter) and form soil.
The basic components of soil are minerals, organic matter, water, and air. The typical soil consists of approximately 45% mineral, 5% organic matter, 20-30% water, and 20-30% air.
Posted by Garima Jain 5 years, 4 months ago
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Posted by Rajesh Yadav 5 years, 4 months ago
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Gaurav Seth 5 years, 4 months ago
A soil profile is a vertical section through different layers of soil. Each layer has different texture, colour and chemical composition. These layers are termed horizons. The soil consists of three horizons: Horizon
A, Horizon B and Horizon C. The uppermost horizon (also known as topsoil) or A horizon is dark in colour because it is rich in humus and minerals. Humus makes the soil fertile. The next layer is B-horizon that has lesser amount of humus but more minerals. The third layer is C-horizon made of small lumps of rocks with cracks and crevices. The last layer is the bedrock which is hard and difficult to dig.
Posted by Rajesh Yadav 5 years, 4 months ago
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Gaurav Seth 5 years, 4 months ago
Some common methods of soil conservation are explained below:
(i)Mulching: The bare ground between plants is covered with a layer of organic matter like straw. It helps to retain soil moisture.
(11) Contour barriers: Stones, grass, soil are used to build barriers along contours. Trenches are made in front of the barriers to collect water.
(iii) Rock dam: Rocks are piled up to slow down the flow of water. This prevents gullies and further soil loss.
(iv)Terrace farming: These are made on the steep slopes so that flat surfaces are available to grow crops. They
can reduce surface run-off and soil erosion.
(v)Intercropping: Different crops are grown in alternate rows and are sown at different times to protect the soil from rain wash.
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Vineet Sharma 5 years, 4 months ago
Ritika Talwar 5 years, 4 months ago
Ritika Talwar 5 years, 4 months ago
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Pronob Mardi 5 years, 4 months ago
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Yogita Ingle 5 years, 4 months ago
There are five major groups of micro-organisms:
i. Bacteria – They are single celled disease-causing micro-organisms. They can be spiral or rod- shaped.
ii. Fungi – They are mostly multicellular disease-causing microbes. Bread moulds are common examples of fungi.
iii. Protozoa – They mainly include organisms such as Amoeba, Plasmodium, etc. They can be unicellular or multicellular.
iv. Virus -Viruses are disease-causing microbes that reproduce only inside the host organism.
v. Algae – They include multicellular, photosynthetic organisms such as Spirogyra, Chlamydomonas, etc.
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Mohd Shakir 5 years, 4 months ago
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Gaurav Seth 5 years, 4 months ago
The colour texture of soil is determined by parent rock .
Soil properties such as thickness, grain distribution (texture), chemical composition, physical-mechanical, and hydrophysical features are directly determined by the parent rock.
Posted by Ritika Talwar 5 years, 4 months ago
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Gaurav Seth 5 years, 4 months ago
Illegal hunting of animals is called poaching. Poachers hunt the animals for selling their skin, horn, fur and hides. All valuable parts of these animals are used for various purposes and are sold at very high prices.
Uses for ornaments : The bones and other parts like trunks of elephants etc. are used to make ornaments.
Uses in medicines : The horns and bones of some animals like rhinoceros and tigers are used to prepare some traditional medicine specially in Asian countries.
For wall hanging and clothings : The skin, fur and hides are used for the clothing and wall hangings.
Posted by Rudra Madhab Nayak 4 years, 7 months ago
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Sia ? 4 years, 7 months ago
A barn is an agricultural building usually on farms and used for various purposes. In North America, a barn refers to structures that house livestock, including cattle and horses, as well as equipment and fodder, and often grain.
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Meghna Thapar 5 years, 1 month 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.
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Sia ? 4 years, 7 months ago
Unlike regular verbs, Irregular verbs are verbs which do not have to follow any systematic conjugation patterns. As they change forms, regular verbs don't have to go through any crucial change in their simple past and past participle forms.
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