Category Archives: General Science

General science articles for competitive examination

About Human Digestive System

Digestive system of human beings consists of alimentary canal or gut and some accessory organs. Alimentary Canal include Mouth Oral (Buccal) cavity Pharynx Oesophagus Stomach Small intestine Large intestine Rectum and anus Accessory organs include Teeth Salivary Glands Gall bladder Pancreas Liver Alimentary Canal Alimentary canal is coiled, muscular, continuous tube running through the ventral body cavity extending… Read More »

Primary Air Pollutants: Their Sources and Effects on Human Health

Earth’s Primary Air Pollutants are carbon monoxide, nitrogen mono oxide, nitrogen dioxide, sulfur dioxide, ozone, carbon dioxide, Hydrocarbons, chlorofluorocarbons. Sources of these airs and their effects on human health are listed in the article below in tabular form. Pollutant Natural source Anthropogenic source Known or suspected effect Carbon Monoxide Unnoticeable Fuel-rich and stoichiometric combustion mainly from motor vehicles.… Read More »

Human Reproductive System

Human reproductive system becomes functional at a definite age called puberty. Normally, males attain puberty at the age of 13 to 14 years, while females attain puberty at the age of 10 to 12 years. Testis is the primary sexual organ of male whereas ovary is primary sexual organ of female. The male gonad produces sperm and female… Read More »

Photosynthesis: Equation and Process

Photosynthesis means synthesis of food with the help of sunlight. The overall equation of photosynthesis is Photosynthesis process takes place only in green parts of the plant, mostly in leaves and to lesser extent in green stems or floral parts of the plants. Leaves of the plant are known as light powered food factories. A green substance called… Read More »

Various Branches of Science

Various Branches of Science are listed below and discussed them briefly: Acoustics: Study of sound. Aerodynamics: Branch of mechanics that deals with the motion of air and other gases. Aeronautics: Science or art of flight. Agronomy: Science of soil management and production of field crops. Agrostology: Study of grasses. Anatomy: Science dealing with the structure of animals, plants or… Read More »

Elements in the Human Body

Human body is made up of many elements but 99% of the mass of the human body consists of composition of six major elements: oxygen, carbon, hydrogen, nitrogen, calcium and phosphorous.  Another five elements in the human body (potassium, sulfur, sodium, chlorine and magnesium) composed of 0.85% of the mass of the human body. Percentage composition of major… Read More »

Classification of Animal Kingdom

When any plane passing through the central axis of the body divides the organism in two halves that are approximately mirror images it is called Radial symmetry and the animals showing radial symmetry are called Radiata. When the body can be divided into identical left and right halves in only one plane. This kind of symmetry is called… Read More »

Organs of Human Respiratory System

The human respiratory system consists of external nares or nostrils, nasal cavity, nasopharynx, larynx, trachea, bronchi, bronchiole and lungs. The air enters into the nasal cavity through the nostrils. Larynx is a small box and it forms the connection between pharynx and the windpipe or trachea. Larynx is also called voice box. Larynx is covered by pieces of… Read More »

Scientific Instruments and Their Purpose

Scientific instruments are used for scientific purposes. Scientific Instruments are specifically designed, constructed and refined for their purpose. Over time, instruments have become more accurate and precise. Various scientific instruments and their purpose are briefly described below. Actinometer: Actinometer is a device that measures the heating power of radiation. Altimeter: Altimeter is a special type of aneroid barometer,… Read More »

Vitamins – Function, Deficiency and Sources

Vitamin Function Deficiency Sources A-Retinol For normal growth in children. To maintain conjunctiva aids in night vision. To maintain skin and mucous membrane. Roughness and dry skin. Inability to see in dim light. Xerophthalmia leading to blindness (cornea becomes rough and dry). Nyctalopia (Night blindness). Fish, liver, oil, butter, milk, egg B1-Thiamine 1st vitamin to be discovered by… Read More »