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Sia ? 4 years, 6 months ago
Primary sources are firsthand, contemporary accounts of events created by individuals during that period of time or several years later (such as correspondence, diaries, memoirs and personal histories). These original records can be found in several media such as print, artwork, and audio and visual recording. Examples of primary sources include manuscripts, newspapers, speeches, cartoons, photographs, video, and artifacts. Primary sources can be described as those sources that are closest to the origin of the information. They contain raw information and thus, must be interpreted by researchers.
Secondary sources are closely related to primary sources and often interpret them. These sources are documents that relate to information that originated elsewhere. Secondary sources often use generalizations, analysis, interpretation, and synthesis of primary sources. Examples of secondary sources include textbooks, articles, and reference books.
Posted by Abhishek Tikke 6 years, 8 months ago
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Dharmesh Parikh 6 years, 8 months ago
Yogita Ingle 6 years, 8 months ago
Milk is converted into curd or yogurt by the process of fermentation. Milk consists of globular proteins called casein. The curd forms because of the chemical reaction between the lactic acid bacteria and casein. During fermentation, the bacteria use enzymes to produce energy (ATP) from lactose. The byproduct of ATP production is lactic acid. Lactic acid acts on the globular proteins present in the milk and denatures them. This denaturation destroys the tertiary and quaternary structures of proteins and the globular proteins are converted into fibrous proteins thus giving a thick texture to the milk due to coagulation of the proteins.
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Yogita Ingle 6 years, 8 months ago
Let Rahul's age = 5x
Let Haroon's age = 7x
As per given condition
(5x+4)+(7x+4) = 56
5x+7x+8 = 56
12x = 48
x = 4
Rahul's age = 5x = 5x4 = 20 years
Haroon's age = 7x = 7x4 = 28 years
Posted by Aayush Kumar 6 years, 8 months ago
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Anik Kumar 6 years, 8 months ago
Yogita Ingle 6 years, 8 months ago
Communicable diseases are the diseases which spread from an infected person to a healthy person by direct contact. Communicable diseases are caused by some pathogens like bacteria, viruses, fungi, helminths and protozoans.
Bacteria can cause diseases like Tuberculosis, Leprosy, Cholera, Food-poisoning, Sexually transmitted diseases.
Viruses can cause diseases like chicken pox,small pox,measles, poliomyelitis, mumps, rabies etc.
Fungi can causes skin diseases.
Protozoans can cause Malaria, Kala-azar, Ameobiasis etc .
Helminths can cause Taeniasis, Cysticercosis, Ascariasis etc.
Posted by Binit Nath 6 years, 8 months ago
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Yogita Ingle 6 years, 8 months ago
Sowing is the process of addition of seeds into the soil. Seeds are sown in the field by hand or by using seed drill. There are traditional seed drills as well as modern seed drills.
Posted by Rudrakshi Jindal 6 years, 8 months ago
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Posted by Kavyansh Rawal 6 years, 8 months ago
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Yogita Ingle 6 years, 8 months ago
- Protozoa are one-celled organisms that can cause diseases ranging in severity from mild to deadly. These organisms can be classified as parasitic or free-living.
- Parasitic protozoa are found in organisms such as ticks, flies and mosquitoes. Example: Malaria. Malaria is carried by an infected mosquito.
Posted by Kamal Kapali 6 years, 8 months ago
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Anik Kumar 6 years, 8 months ago
Yogita Ingle 6 years, 8 months ago
As the seeds germinate, the growing saplings should be provided with nutrients and water. Hence soil should be replenished with minerals in periodic intervals of time. Manure and fertilisers supply nutrients to the soil. This is called as replenishment of nutrients.
Manure and fertilisers replenish the soil by supply nutrients to the soil.
*Manure is the organic matter added to the soil to replenish it with nutrients. The wastes from household, animal dung and agricultural wastes are buried in small pits. Decomposition by bacteria and earthworms occurs in these pits converting organic wastes into manure. Manure increases the water retention capacity of soil.Manure is ecofriendly and replenishes the soil with nutrients which can persist for longer time whereas fertilisers though not ecofriendly supply nutrients for immediate usage by the plants.
*Fertilisers supply specific type of nutrients for the plant. Fertilisers are the chemicals which add minerals like potassium, phosphorus and nitrates to the soil.
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