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Meghna Thapar 5 years, 10 months ago
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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Yogita Ingle 6 years, 4 months ago
A barometer is a scientific instrument used in meteorology to measure atmospheric pressure. A simple barometer consists of a long glass tube (closed at one end, open at the other) filled with mercury and turned upside down into a container of mercury. The barometer works by balancing the mercury in the glass tube against the outside air pressure, just like a set of scales. As air pressure increases—that is, as the air becomes heavier—it pushes more of the mercury up into the tube. As air pressure decreases, more of the mercury drains from the tube. So the level of mercury in the tube provides a precise measure of air pressure.
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Meghna Thapar 5 years, 6 months ago
As the yeast cells metabolize the sugar, they release carbon dioxide gas. The build up of carbon dioxide gas in the bottle causes the balloons to inflate. For yeast to be active, it needs to be warm and moist. That's why we added lukewarm water and placed the bottle in more warm water. As the yeast continued to react, it converted more and more sugar into carbon dioxide gas. This gas was trapped in the balloon, making it inflate
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Yogita Ingle 6 years, 5 months ago
The Haryana state of north India has 2 National Parks.
- Sultanpur National Park
- Kalesar National Park
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Friction is caused by the irregularities on the two surfaces which are in contact. The irregularities on both surfaces tend to lock into each other and this resists the motion of the object. The nature of the surface (smoothness or roughness) affects the friction.
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Meghna Thapar 5 years, 10 months ago
a. The lowest temperature at which a substance catches fire is called its ignition temperature.
b. Petrochemicals are the chemical substances which are derived from petroleum and natural gas.
c. The slow process by which the dead plants buried deep under the earth have become coal is called carbonisation.
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Meghna Thapar 5 years, 10 months ago
A park is an area of natural, semi-natural or planted space set aside for human enjoyment and recreation. However, a National Park is a relatively large area of scenic beauty protected and maintained by the government to preserve flora and fauna, landscape, historic objects of the area and the places of scientific interest.
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