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Destruction Caused By Cyclones:
Cyclones are the greatest storms on earth and can be very destructive. It causes loss of life in coastal area in three ways:
- The force of high speed winds accompanying cyclone destroys trees, electric poles, telephone poles, vehicles houses and causes threat to life. Strong winds push water towards shore even if the storm is hundreds of kilometers away. These are the first indications of an approaching cyclone.
- Cyclones bring with them torrential rains. The continuous heavy rains brought by cyclones may worsen the flood situation in the cyclone prone areas.
- The floods caused by cyclones causes polluted drinking water which causes water borne diseases like typhoid and dysentery.
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Fast moving air towards a centre; usually with heavy rain; is known as cyclone. Wind direction, wind speed, humidity and temperature together create cyclone.
When water vapour in the clouds cools down it releases heat. This heat warms the air around the clouds. The warm air rises up and creates a low pressure zone. This low pressure zone is quickly filled in by cooler air from the surrounding. This creates a system in which the centre is having very low pressure and is surrounded by wind moving around it. The wind from the surroundings moves in a circular fashion towards the centre and gives rise to cyclone.
Destruction caused by Cyclone: A strong cyclone can be very destructive.
Since cyclone is accompanied with high speed wind, it can damage houses, telephone poles, electric poles and uproot trees.
Strong wind of the cyclone may push the sea water towards the sea shore in the form of high wave. These high waves may damage houses and push water to low land which may be accompanied with loss of life and properties.
Being the area of very low pressure, eye of cyclone lifts water in the centre. This may cause the rise of water up to 3 to 15 metre high. This appears like a water wall. This water wall; when pushed towards seashore; can inundate a large area, which can cause the loss of life and property.
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The different methods of asexual reproduction:
- Vegetative propagation- It is a type of asexual reproduction in which new plants are produced from roots, stems, leaves and buds.
- Budding- In organisms such as Hydra, a bud develops as an outgrowth at one specific site.
- These buds develop into tiny individuals and when fully mature, detach from the parent body and become new independent individuals.
- Spore formation- The spores are asexual reproductive bodies.
- Each spore is covered by a hard protective coat to withstand unfavourable conditions such as high temperature and low humidity.
- So they can survive for a long time. Under favourable conditions, a spore germinates and develops into a new individual.
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Many countries have tropical forests. The countries with the largest areas of tropical forest are (in order):
(1) Brazil
(2) Congo
(3) Peru
(4) Indonesia
(5) Columbia
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Pharynx; The nasal chambers open up into a wide hollow space termed as pharynx. It is a common path for both air and food. It functions by preventing the entry of food particles into the windpipe. The epiglottis is an elastic cartilage which serves as a switch between the larynx and the oesophagus by allowing the passage of air into the airway to the lungs, and food into the gastrointestinal tract.
Trachea: The trachea or the windpipe rises below the larynx and moves down to the neck. The walls of trachea comprise of C-shaped cartilaginous rings which give hardness to the trachea and maintain it by completely expanding. The trachea extends further down into the breastbone and splits into two bronchi, one for each lung.
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Meghna Thapar 5 years, 10 months ago
The SI unit of heat is joules which is defined as the amount of energy needed to raise the temperature of a given mass by one degree. In the CGS system, heat is expressed in the unit of calories which is further said to be the heat energy needed to increase the temperature of 1 gm of clean water by one degree Celsius. Sometimes kilocalorie (kcal) is also referred to as a unit of heat where 1 kcal = 1000 cal.
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