Notes and Material for G.K-I Compulsory Subject of CSS.
Genes: Genes are the things that determine physical traits ─ how we look ─ and lots of other stuff about us. They carry information that helps make you who you are: curly or straight hair, long or short legs, are all passed through generations of your family in genes. Each cell in the human body […]
Introduction: AIDS (acquired immunodeficiency syndrome) AIDS is the name given to the late stages of HIV infection, first discovered in 1981 in Los Angeles, California. By 1983 the retrovirus responsible for it, the human immunodeficiency virus (HIV), was first described, and since then millions around the world have died from contracting the disease. It is […]
Climate Change: The temperature of the Earth is determined by the balance between energy from Sun and its loss back into space. Of Earth’s incoming solar short-wave radiation (mainly ultraviolet (UV) radiation and visible ‘light’) nearly all of it passes through the atmosphere without interference. The only exception is ozone that luckily for us absorbs […]
The Beginning of Digestion Process: The Mouth Food enters the body through mouth, or oral cavity. The process of digestion starts from the mouth. The moments food enters the mouth, it gets struck by the teeth and assaulted by starch-degrading enzymes. Saliva (and the teeth) begins the assimilation process. Saliva is a fluid secreted by […]
Major Elements in the Human Body: All matter, living or not, be it any form solid, liquid, or gas is made up of one or more, of only 106 elements found on Earth. Ninety-two of these elements occur naturally. The other 14 are man-made, and they break down in a fraction of second. The 92 […]
Introduction: The rocks of the earth’s crust vary according to mineral composition. Rocks are made out of particles that are made of different combination of normal elements as oxygen, silicon, aluminum, iron, and calcium, together with less-abundant elements Although rocks can be classified according to their physical properties, but the more common approach is to […]
Human Reproductive Systems: In both male and female, the reproductive system comprises of a pair of primary reproductive organs (gonads) and various accessory glands and ducts. Taken altogether, the human reproductive system produces gametes, stores and releases sex cells, and nourishes and protects the developing embryo. The Male Reproductive System: The male reproductive system delivers, […]
Atmosphere: Earth’s atmosphere is a blanket of gases made out of 78% Nitrogen, 21% Oxygen, and 1% Argon. The other trace gases present in atmosphere are Carbon Dioxide, Hydrogen, Neon, Helium, Krypton, and Xenon. Water vapor dislodges other gases and varies from almost zero to around 4% by volume. The atmosphere lays on Earth’s surface […]
The ozone layer is vital for life on Earth as it shields life from dangerous UV radiation. Though ozone layer does not absorb all the harmful UV, yet it averts around 80 percent of it from reaching earth.
Earthquake: One of the most horrible natural disasters is earthquake which has not only ability of eradicating even entire cities but also they can be a cause of tsunamis and devastation on huge scale. So far human science has only been able to predict the fault line (danger zone) but still it is unable to […]
Acid Rain: Acidic gases like carbon dioxide and Sulphur dioxide dissolves with the water within the rain cloud and causes acid rain. Acid Rain is formed due to emission of poisonous gases into the atmosphere by human activities. Fossil-fuelled powered stations and oil/diesel vehicles radiate synthetic pollutants– chiefly sulphur dioxide (SO2) and nitrogen oxides (NOx) […]