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Yogita Ingle 5 years, 8 months ago
Reflex action is the extremely quick, automatic, sudden action in response to something in the environment.
Example- i) Immediately pulling back of fingers after touching a hot plate.
ii) Closing of eyes when flashed with high intensity light.
iii) Salivation when hungry.
- Reflex arc is the pathway of nerve involved in reflex action.
- Reflex arc involves-
- Receptors- receive the message from external environment.
- Sensory neuron- carries the message from the receptor to the central nervous system.
- Central nervous system- processes the message and sends impulses to the concerned part of the body in the form of response.
- Motor neuron- carries the message from the central nervous system to the effector.
- Effector- responses against the stimulus.
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Yogita Ingle 5 years, 8 months ago
The excretory system performs many functions such as:
- Helps eliminate waste products such as urea, uric acid ammonia, and other products via urine.
- It helps maintain the osmotic level of blood and plasma
- It helps maintain the electrolyte balance in the body
- And it also helps in the metabolism of those drugs that do not get metabolized in the liver.
Posted by Sagar Singh 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
Exothermic Reaction
The chemical reactions which proceed with the evolution of heat energy are called exothermic reactions.
Examples:
Carbon burns in oxygen to form carbon dioxide and heat energy is produced.
C + O2 → CO2 + Heat
Water added to quick lime (calcium oxide), slaked lime (calcium hydroxide) is produced with a lot of heat energy.
CaO + H2O → Ca(OH)2 + Heat
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Meghna Thapar 5 years, 8 months ago
Combination Reaction: When two or more substances combine to form a single product, the reaction is known as a combination reaction.For example: In the laboratory, iron sulphide is prepared by mixing iron and sulphur.
Fe(s) +S(s) FeS(s)
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Yogita Ingle 5 years, 8 months ago
The four major pressure belts of the Earth are:
- Equatorial Low Pressure Belt
- This belt lies between 0°N to 5°N and 0°S to 5°S
- Since the vertical rays of the Sun fall on the Earth, the heat is intense and the temperature is high. The air becomes warm and expands.
- The convection currents also help to spread the heat to the upper layers of the atmosphere.
- This leads to the creation of a low pressure belt in the region. Winds in this pressure belt do not blow at a fast pace and hence this belt is also known as the Belt of Calms or the Belt of Doldrums.
- Sub tropical high Pressure Belt
- This belt is located between 30°N to 35°N and 30°S to 35°S.
- As the air at the equator moves toward the Poles, it begins to cool and sink down at about 30° North and South of the Equator. This creates the areas of high air pressure.
- Due to the rotation of the Earth, air from 60°N and 60°S also descends in the sub tropical belts.
- This pressure belt is also a belt of clams and is referred to as the Horse Latitudes.
- Circum Polar Low Pressure Belt
- This belt is located between 60°N to 65°N and 60°S to 65°S.
- It is a zone of two winds; the warm Westerly winds meet the cold polar Easterlies. As the Westerlies are lighter, they rise over the cold polar winds creating a low pressure area.
- These belts experience stormy weather and cyclonic activity especially during the winters.
- Polar High pressure Belts
- This belt is located between 85°N to 90°N and 85°S to 90°S.
- The Polar Regions experience cold climatic conditions as the rays of the Sun are extremely slanting.
- The cold air sinks down giving rise to high pressure areas.
- In these places the temperature is permanently low, and the air is dense and heavy. These Polar Regions have permanent ice caps.
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Shivani Mithi 5 years, 8 months ago
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