high school environmental science

You have learnt that sound is a form of energy. It is produced by vibrations. Sound waves are longitudinal waves. They are also elastic waves hence they need a material medium for their transmission. They can not be transmitted in vacuum. They travel in solids, liquids and gases. Their velocity is ..

High fever, headache, body ache, nausea and violent shivering (rigours) are some of the symptoms of malaria. Each malarial attack lasts for 6-10 hours and consists of the cold stage (shivering), hot stage (fever) and sweating stage (temperature goes down to normal). The fever is repeated..

It causes elongation of stem (high concentration) and root (low concentration). It promotes root initiation in cuttings and callus. (Callus is an undifferentiated mass of cells from which the entire plant body can be grown by tissue culture techniques.) It also promotes root developme..

Man is a highly evolved vertebrate and so the excretory organs are well developed. ..

Light is a form of energy and can be transformed into other forms of energy. You would have observed the path of 'a beam of light' inside a room. This beam is nothing but the scattered light produced by the dust particles. Beam of light becomes invisible if the room is dust free. Thus light makes ..

Question: What is the main cause for winds to blow? Answer: Due to unequal heating of the earth's surface there is a difference in pressure in the atmosphere. The air moves from region of high pressure (cold region) to the region of low pressure (hot region). This moving air is..

Conductors and Insulators - Substances which allow electricity to pass through them easily are called conductors. These are made from materials which have low resistances. Metals like copper, aluminium, silver, iron, brass and also salt solutions are good conductors of electricity. Substances which..

Gastric Juice - It is secreted by the secretory glands of the stomach wall. It is highly acidic as it contains hydrochloric acid (HCl). It also contains enzymes like pepsin and renin. Both act on proteins. However, renin is present only in young children. It digests the milk proteins. Pep..

>Forests are an area of diverse biodiversity consisting mainly of trees, shrubs, wild plants, a variety of organisms and wild life Management of forest resources has to take into account the interests of various stakeholders as well as involve their participation in local conservation management Va..

While studying the periodic table, it will be noticed that with the increase in the atomic number, there is an increase in atomic mass as well (with some exceptions). Usually an element with high atomic number has high atomic mass as well. If you recall from earlier lessons, At..