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Cbse social science notes

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Cbse class-10th notes science||control and coordination

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Chapter-7 biology Control and Coordination ●All the living organisms respond and react to changes in the environment around them. ●The changes in the environment to which the organisms respond and react are called stimuli such as light,heat,cold,sound,smell,touch etc. ●Both plants and animals are respond to stimuli but in a different manner. Control and Coordination in Animals It is brought about in all animals with the help of two main systems: (a)Nervous system (b)Endocine system Nervous system ◆Control and coordination are provided by nervous and muscular tissues. ◆Nervous tissue is made up of an organized network of nerve cells or neurons ,and is specialized for Conducting information via electrical impulses from one part to the body to another. Receptor: Are specialized tips of some nerve cells that detect the information from the environment .These receptors are located in our sense organs . ◆ Ear:   •Photoreceptors               •Hearing                •Balance of the body ◆ Eye
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Chapter-6 Science notes life Processes •All living things perform certain life processes like growth, excretion, respiration, circulation etc. •All the processes like respiration, digestion, which together keep the living organisms alive and perform the job of body maintenance are called life Processes. Example Life Processes -Growth -Digestion -Respiration -Circulation -Excretion I.     Nutrition (The whole process by which an  organism obtain it's food) Nutrition in plants •Plants are autographs. •can make their own food. Nutrition in Animals •Animals are hetrotrophs. •Depends on plants or other animals for their food. Mode of Nutrition Autrotrophic This kind of nutrition in which inorganic material like Co², water etc.are utilised to prepare organic food by the process of photosynthesis. E.g green plants. Hetrotrophic This kind of nutrition in which organisms do not possess the ability to synthesize their own food.They depend on autograph for their supply directly or indirectly.
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Family Backgroung of Ratan Tata

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  FAMILY   BACKGROUND The Parsi community is believed to have lived in Persia (present – day Iran) hundreds of years ago.Their people gradually spread to all the countries of the world based on trade industry.In the same sequence, the Parsis also arrived in India centuries ago.Despite being spread across many regions of the world, their number is limited.They are considered particularly the worshippers of fire, but they also worship the sun, moon, and air.In the old days, the Parsi community gave special emphasis to archery, horse riding, and character-building. Changes in many areas were inevitable over time. Nevertheless, their perseverance on the purity of community and character is more or less still intact .As a community inclined towords preserving their heritage they do not encourage marriage outside their own societies, even if they married in close relationships, so that the purity of the caste could be preserved.This taboo is still present to a great extent.Even mentally,Pa
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Cbse notes social science class-10th  Money And Credit Social chapter(economic)   Money and Credit →In the early times, people used to exchange one Commodity for another, depending on their requirements under the barter system. However, exchanging goods in the barter system required a double Coincidence of wants. →But money eliminates the need for a double coincidence of wants.Since money enables the exchange process, it is called a Medium of exchange. Early forms of money were things of use. → Modern Currency: •Uses paper notes and coins made of  relatively inexpensive metals. •Have no value of its own. •Has a value only because it is authorised by the government of a country. →In India , the Reserve Bank of India is the only legal authority that can issue currency notes and coins on behalf of the Central Government.The Rupee is India's currency and nobody can refuse to accept a payment made in rupees in India. →People deposit their extra cash in bank.A bank in addition to keeping
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