need for science teachers

One crop component requires comparatively lesser water than the othe..

Sound Needs a Medium to Travel - The origin of sound is always some vibrating body. In some cases the vibrations of the source may be very small or very large that it may not be possible to detect them. This type of vibrations is produced by tuning fork, drum, bell, the string of a guitar..

Everything that we use or consume - food, clothes, vehicles, tools, petrol, furniture, medicines, books, toys, and the infrastructure of electricity, roads bridges, and buildings are obtained from resources on this earth. The only thing one gets from outside is the sun's energy and even this is co..

Sound can propagate not only through gases but also through solids and liquids. Some materials like air, water, iron etc can easily transmit sound energy from one place to anothe..

The food of dairy animals needs to serve two basic purpose..

Question: Why do organisms need food? Answer: Organisms need food for obtaining energy to perform the vital function..

You need to get acquainted with the usage of the microscope, for observing cells..

Sustainability means keeping an effort going continuously, or the ability to last out and keep from falling. So sustainable agriculture means successful management of resources for agriculture to satisfy the changing human needs, while maintaining or enhancing the quality of environment a..

All our natural resources which we manipulate to satisfy human needs come from the environment. These are air, water, soil, minerals, coal, petroleum, animals and plant..

It includes fuels which are most commonly used such as wood, coal and petroleum. These fossil fuels are non-renewable sources of energy. Therefore we need to conserve the..