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devipriyasampath

Disease causing organisms

Some Insects are injurious to man as vectors of human diseases.Through the ages millions of people have died of diseases transmitted by insects.There are a number of insect borne diseases,and they may be transmitted in different ways. ⭐Housefly House flies are cosmopolitan in distribution.They are closely associated with humans and […]

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Memory

Memory refers to the processes that are used to acquire, store, retain, and later retrieve information. There are three major processes involved in memory: encoding, storage, and retrieval. Human memory involves the ability to both preserve and recover information we have learned or experienced. The term memory denotes a specific brain […]

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Aquarium

An aquarium is a container made of glass,or with glass walls.It permits watching the fishes swimming easily and for prolonged periods of time.It is a hobby which appeals to young and old and has opened up a flourishing business in all big cities. And also,next to birds,fishes are perhaps the […]

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Migrant Labour

A person who migrates or who has migrated from one country to another with a view to being employed other than on his own account.India is a vast country with high percentage of uneducated, unemployed and unskilled labour suffering from acute poverty.Regional imbalances add to their problem.Many of them are […]

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Management of hazardous and non-hazardous wastes

⚫Management of hazardous wastes Hazardous wastes may remain dangerous for thousands of years.Tye hazardous waste include radioactive refuse, metallic compounds, organic solvents, acid asbestos, organic cyanide’s, hospital wastes, disposable medical equipments and tools. The hazardous methods are adopted for the disposal of hazardous wastes. ⭐Landfills:There are permanent storage facilities for […]

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Art and Architecture of Tamilnadu

The Sangam Tamils had their own system of music,dance and drama(Pann,Aadal and Koothu).The Panar and Viraliyar were proffesional musicians and dancers.String instruments (Yaazh) wind instruments (kuzhal) and drums(Muzhauu) were used in such performances.Festivals and worship were also associated with dance and music(Kuravai,Veriyaattu).The pallava inscription at kudumianmalai refers to a great […]

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Movement in plants

The movement in plants is mostly seen as bending, turning, twisting or as elongation of plant parts.Plants are fixed in a place with their roots in the ground.They lack the power of locomotion,but they can move individual parts or organs when subjected to external stimuli like light,water, chemical substances and touch. […]

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Pests

Any animal which becomes a source of trouble or loss to human is called a pest.Among insects such pests are numerous and are of different kinds.An insect is usually called as a pest when it causes appreciable damage and loss to the crops or other belongings.The pests may be classified […]

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Fish farming

Fish farming is the raising of fish for personal income or profit Based on the environment in which culture is done.is the fastest growing area of animal food production. Today, about half the fish consumed globally are raised in these artificial environments. Characters and cultivable fish The following criteria should […]

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Fouling Organisms

A fouling organism is an animal or plant species that exists in water and attaches to the surface of a material immersed in the water. When attached to a ship’s hull, these organisms accumulate and grow to form undesirable layers of material. Several aquatic organisms cause damages to submerged surfaces.Since this […]

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Beneficial insects

Insects affect man’s welfare in many ways.Many insects are beneficial to man.Beneficial insects are divided into two main groups according to the nature of benefit derived from them.They are Productive and Helpful insects. ⚫ Productive insects These insects produce certain substances which are useful to humans.The important insect products are […]

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Plant nutrition

Intake of nutrients into the body by an organism is called nutrition.All the nutrients required by organisms are obtained through the food they consume.Plants use inorganic minerals for nutrition. Complex interactions involving weathering of rock minerals, decaying organic matter, animals, and microbes take place to form inorganic minerals in soil. […]

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Herbarium

Herbarium is a collection of pressed,dried plant specimens mounted on specified sheets, identified and arranged in the order of an approved and well known system of classification.It also refers to the institution where dried plant specimens are maintained and studied. A twig with leaves, inflorescence or flowers is collected from […]

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Native games of India

Looking at the modern children,one striking difference between the childhood that the previous generation had and the one that this generation has is the lack of Indian or native games .Several traditional sports are still popular amongst kids in the urban and rural areas but they are restricted mainly to […]

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