Author Archives

Vaishnavi Selvakumar

Periyar E.V.Ramasamy

One of the best social reformers in Tamilnadu. He was born on September 17, 1879 in Erode. He was the son of a wealthy businessman Erode, Venkatappa and Chinna Thayammal. He got married at 13th year and renounced his life ar 19th year. By wearing saint dress he went to […]

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RAJAJI

C. Rajaji was born on December 10th 1878 at Thorappalli. He joined the Inc and participated in 1906 Calcutta conference. He participated in 1907 Surat conference and become a staunch follower of Gandhiji. During 1919 Rowlatt act he joined in Independence struggle. He was the leader of the Tamilnadu Congress […]

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Man and the Environment

Environment is the surroundings of man. Earth is a big environment. Man lives in the environment. Man depends on the environment. Whatever he gets, he gets from the environment. Whatever he gives, he gives to the environment. The environment contains natural resources. He exploits them for his welfare. As he […]

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Heart of Man

The heart is a four chambered muscular pump located inside the chest .It is ‘heart’ of circulatory system. The heart is conical in shape. The heart is a mesodermal derivative. The adult human heart is roughly about the size of a closed fist. It is a myogenic heart. The heart […]

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Thermoregulation in Camel

Camel is a desert mammal. It is called the ship of the desert as it is well adapted to live in hot sand of deserts. The camel has the following adaptations for desert life: 1. Camel is an eurythermal animals as it has the ability to tolerate wide variations in […]

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Hygiene

Hygiene is the science of rules of healthy living. Food hygiene is very important for healthy living because most of the diseases and disease producing germs are transmitted through food. The food may be contaminated at any stage during its journey from the producer to the consumer. It is contaminated […]

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Nutrition

Nutrition is a science dealing with the composition of food, food intake and its assimilation in the body. It includes food, ingestion, digestion, absorption and egestion. Types of Nutrition Nutrition is the process of obtaining nourishment. It includes food, ingestion, digestion, absorption and egestion. Protozoans exhibit 6 types of Nutrition. […]

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Food

Life cannot exist without energy. Energy is inevitable for the day – to- day life activities. This energy is derived from food. Food is defined as a composite mixture of various substances which sustain life activities. Foodstuff is defined as anything which can be used as food. The foodstuff of […]

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Tobacco Abuse

Tobacco is obtained from the tobacco plant Nicotiana tobaccum and Nicotiana rustica. The dried and cured leaves of its young branches make the commercial tobacco used worldwide. Addiction to tobacco is due to ‘Nicotine’ an alkaloid present in it. Nicotine is a stimulant, highly harmful and poisonous substance. Tobacco is […]

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Heart Disease

Cardiovascular disease (CVD) is associated with disease of the heart and blood vessels. Coronary heart Disease (CHD) is the most common form and is caused by deposition of cholesterol in the blood vessels. It usually develops slowly over many years beginning from childhood, they may form a fatty streak to […]

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Solid Waste Management

Solid Wastes mainly include municipal wastes, hospital wastes, industrial wastes and e-wastes etc. The solid wastes are dumped in the soil which results in landscape pollution. Solid- waste management involves the collection, treatment and proper disposing of solid material that is discarded from the household and industrial activities. Methods of […]

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Soil Erosion

The top layers of soil contain humus and minerals salts, which are vital for the growth of plants. Removal of upper layer of soil by wind and water is called soil erosion. Soil erosion causes a significant loss of humus, nutrients and decrease the fertility of soil. Agents of Soil […]

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Wildlife and its Conservation

Wildlife refers to the undomesticated animals living in their natural habitats (forests, grasslands and deserts) an area without human habitation. They are needed for maintaining biological diversity. It also helps in promoting economic activities that generates revenue through tourism. Conservation of forest and wildlife is interrelated with each other. Decline […]

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Forest and it’s Importance

Forests are an important component of our environment and are dominated by microorganisms, flowering plants, shrubs, climbers, dense trees and provide a vast habitat for wild animals. Forests also contribute to the economic development of our country. Forests are vital for human life, it is a source for a wide […]

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External Morphology of leech

Shape and size: The body of a leech is soft, vermiform, elongated and segmented. It becomes ribbon shaped when extended and almost cylindrical when contracted. Leeches may grow to a length of 35cm. Colouration: Dorsal surface is olive green in colour and the ventral surface is orange yellow or orange […]

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