Disorders caused by Drinking Alcohol: Alcohol is a slow poison which in a man’s body is destructive to both physical and mental processes. Alcohol in any form: wine, whisky, beer, brandy, gin or toddy, is harmful to health. Beginning with small quantities of alcohol for pleasure and adventure, people become addictive to it and take
Growth and Development: Growth is defined as an irreversible increase in the size and form of an individual. Growth is a characteristic feature of all living organisms. You have seen small seedlings grow into big plants and small babies growing into adults. However, growth always occurs in such a manner that the particular characters of
Respiration: Respiration is the process of taking oxygen into the cells, using it to release energy from the digested food and eliminating the waste products (carbon dioxide and water). Respiration involves two main processes: Breathing or External Respiration: The process of taking in oxygen-rich air from the surrounding medium and giving out carbon dioxide-rich air
Kinetic Energy and Potential Energy: Kinetic Energy: A body in motion can do work. It can displace another body at rest. It can deform another body. If a moving car hits a bicycle, it deforms the bicycle. The energy possessed by a body due to its motion is called kinetic energy. The word kinetic has
Atmospheric Electricity: Static electricity is the cause of lightning. Strong winds often rise to a great height. In so doing they displace water drops in a cloud so violently that some are torn apart. Due to friction between the wind and the clouds, the clouds get electrically charged. In general, the upper part of clouds
Micro-Organisms Causing Diseases: Micro-organisms like bacteria, fungi, protozoa and viruses cause many diseases in human beings. They enter our body through contaminated water, food or milk, through contaminated air and insect bites. Dirty open drains, stagnant pools of water and garbage dumps are ideal places for the micro-organisms and insects like mosquitoes and flies to
Conservation of Soil: There are two basic ways of conserving soil- Preventing Soil Erosion: The removal of the top fertile soil by any agency like wind or water is called soil erosion. It is very harmful as it can lead to landslides and other imbalances in nature. Moreover, it takes 900 years for a single
Male Reproductive System: The male reproductive system is composed of testes together with accessory ducts and structures including the epididymis, vas deferens, ejaculatory duct, the distal portion of the urethra, the penis and several glands. Testes: Man possesses two ovoid glandular testes which are concerned with the formation of male gametes, the spermatozoa. Testes are
Female Reproductive System: The sex organs of female mammals are specialized for egg production, for receiving sperms from the male, for providing an adequate medium for fertilization and for protecting and nourishing the developing embryo. For these multifarious activities, the reproductive system of human female consists of two ovaries, Fallopian tubes (oviducts), uterus, vagina and
Evolution of Varna System: The literal meaning of varna was colour. From the Rigveda, we come to know that the earlier basis of division in society was colour. As we know the Aryan migrants were white-skinned people and they were conscious about their colour so they were maintaining a distinct identity against the black-skinned people.
