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Meghna Thapar 5 years, 3 months ago
Ductility is the physical property of a material associated with the ability to be hammered thin or stretched into wire without breaking. A ductile substance can be drawn into a wire. Examples: Most metals are good examples of ductile materials, including gold, silver, copper, erbium, terbium, and samarium. Metals are described as malleable (can be beaten into sheets) and ductile (can be pulled out into wires). This is because of the ability of the atoms to roll over each other into new positions without breaking the metallic bond.
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Yogita Ingle 5 years, 4 months ago
The undesirable plants that grow among the crops are called weeds. The process of removing these weeds is known as weeding. Weeds compete with the crop plants for nutrients and space.
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Meghna Thapar 5 years, 3 months ago
Most of the fluid in semen is made up of secretions from male reproductive organs. Semen contains citric acid, free amino acids, fructose, enzymes, phosphorylcholine, prostaglandin, potassium, and zinc. Semen is made up of sperm cells, as well as a number of bodily secretions. These secretions include: prostatic fluid, which neutralizes the acidity of the ******. seminal fluid, which contains proteins, fatty acids, and fructose to nourish the sperm.
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Yogita Ingle 5 years, 4 months ago
Virus: You may be surprised to know that the viruses can be crystallized and stored like some non-living things, such as common salt and sugar. On the other hand, they multiply like living organisms when they are within a living body.
Fungi: Fungi are non-green plants. They cannot synthesize their own food. They have to depend for their food on others. Most fungi take their food from dead organic matter. Some live on other organisms as parasites.
Algae: Algae are green substances floating on the surface of a pond, lake, river, stagnant water, moist soil, stones. They tend to grow on wet surfaces. Therefore, they can synthesize their own food. They are found in water or in very moist places.
Protozoa: Protozoa are unicellular animals. Some are free-living, others are parasites. Several parasitic protozoans cause diseases in human beings, domestic animals and plants. For example, Plasmodium, a protozoan, causes malaria.
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Meghna Thapar 5 years, 3 months ago
Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other.
The friction force depends on two factors:
- a) The materials that are in contact. The two materials and the nature of their surfaces. ...
- b) The force pushing the two surfaces together. Pushing the surfaces together causes the more of the asperities to come together and increases the surface area in contact with each other.
A good example is when you ride a bicycle on a road. The wheels of the bicycle move on the road. The bicycle will slow down until it comes to a halt. The two types of kinetic friction are sliding friction and rolling friction.
Posted by Abhinav Gupta 5 years, 4 months ago
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Meghna Thapar 5 years, 3 months ago
Fluids exert drag on the solids moving through them, which is somewhat like friction that tries to oppose the motion of the body and slows it down. Hence, streamlined shape is given to the bodies moving through fluids, as in ships and submarines.
Posted by Simran - 5 years, 4 months ago
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Yogita Ingle 5 years, 4 months ago
|
INFECTIOUS DISEASES |
NON-INFECTIOUS DISEASES |
|
1. Caused due to attack of pathogens |
1. Caused by factors other than pathogens |
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2. Caused due to extrinsic factors |
2. Caused due to intrinsic factors |
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3. Transmitted from one person to another |
3. Do not get transmitted from one person to another |
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4. Transmission of diseases occurs through direct contact or some medium (air, water, vectors) |
4. Transmission in case of hereditary diseases is from parent to offspring |
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5. Community hygiene can reduce the occurrence of these diseases |
5. Community hygiene is ineffective in reducing the occurrence of these diseases |
|
E.g. Cholera, Malaria |
E.g. Diabetes, Goitre |
Posted by Tapan Sinha 5 years, 4 months ago
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Yogita Ingle 5 years, 4 months ago
Characteristics of Synthetic Fibres
- Synthetic fibres are cheaper than natural fibre.
- Synthetic fibres are stronger than natural fibre.
- Synthetic fibres are more durable than natural fibre.
- Synthetic fabrics are dried up in less time.
- Synthetic fibres are easy to maintain and wash.
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Meghna Thapar 5 years, 3 months ago
Agricultural Implements:
Before sowing the seeds, it is necessary to loosen and turn the soil in the fields as to break it to the size of the grains which is done with the help of three main implements or tools – plough, hoe and cultivator.
- Plough: Plough is a large agricultural implement which is used for ploughing or tilling in the fields. The traditionally wooden plough consists of a long log of wood called a plough shaft having a handle at its one end. Below the handle is a strong triangular iron strip called ploughshare. The other end of the ploughshaft can be attached to a wooden beam which is fixed at the right angles to the ploughshaft.
This beam is placed over the neck of two bullocks so as to pull the plough. When the plough is pulled by a pair of bullocks, the farmer holds the handle of the plough and presses down the handle due to which the ploughshare digs into the soil, loosens it and turns it.
- Hoe: It is an agricultural implement used for removing weeds, and loosening and turning the soil. It consists of a long rod of wood or iron. There is a handle at one end of the hoe. A strong, broad and bent plate of iron is fixed below the handle and acts like a blade. The other end of hoe has a beam which is put on the neck of bullocks. Thus, a hoe is also pulled by animals like bullocks. Thus, it is a kind of modified plough.
- Cultivator: The cultivator is a tractor driven agricultural implement which is used for loosening and turning the soil in the fields quickly. It has many ploughshares which can dig into the soil at the same time, loosen it and turn it. Thus, the field can be ploughed in a short duration of time.
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Muskan Mishra 5 years, 4 months ago
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Meghna Thapar 5 years, 4 months ago
The cutting and gathering of the matured food crop is called harvesting. In harvesting, the crops like wheat or rice are cut close to the ground by hand using a cutting tool called sickle. This is called manual harvesting. Harvesting is either done manually or by using a machine called harvester. Threshing is done after harvesting. The process of beating out the grains from the harvested crop plants is called threshing. Threshing is done with the help of a machine called combine. A combine is a huge machine which cuts the standing cereal crops in the field, threshes it and separates the chaff from the grain in one operation. A combine is a combined harvester and thresher.
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Yogita Ingle 5 years, 4 months ago
Synthetic plastic is a material consisting of any of a wide range of organics that are malleable and can be molded into solid objects of diverse shapes.They are derived from petrochemicals but many are partially natural.These are organic molecules of high molecular mass.
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