science fair projects 12th grade

The surfaces of bodies are never perfectly smooth. Even a very smooth surface seen under a microscope, is found to have depressions and projections as shown in the figure belo..

Electricity is obtained from flowing water. Water from the dam is allowed to flow through the tunnels at a high pressure. Turbines convert the potential energy of the water into electrical energy. About 23,800 MW of energy is generated by hydel power in India. Hydel power requires construction of b..

It is a portion of the large intestine that is not very well developed in man. It is more developed in cattle and other ruminants. In man, it shows a small projection called the appendix . The infection of appendix is called appendicitis. It is a vestigeal organ and can be removed if it..

We know that whenever an object is dropped from a height, it falls towards the Earth. Similarly, when an object is projected vertically upwards, it goes up but after attaining a certain height, it starts falling down. It is the force of gravitation which pulls the object towards the Eart..

It makes the study of such a wide variety of organisms easy. It projects before us a good picture of all life forms at a glance. It helps us understand the interrelationship among different groups of organisms. It serves as a base for the development of other biological sc..

The units of nervous system are specialised cells called the neurons . The general structure of a neuron is as follows: Around the cell body are short sensory projections called the dendrons. The fine branches of dendrons are called the dendrites. These short fibres receive messages..

Since the food is now broken down into the soluble form, the intestinal walls of ileum are able to absorb the nutrients and also water. Due to its large surface area, thin wall lining the cavity and large number of finger-like projections, the villi, maximum absorption takes place in thi..

First step is to gather the materials. You will need a fairly long iron nail or small iron rod, enameled or insulated copper wire, a pair of wire strippers, switch or key, pins and a battery. The insulation at both ends of the copper wire must be removed so that it can be connected to a ..

Dams have been answer to huge and consistent supply of water and electric power needed for modern agriculture and urban cities. Large dams ensure the storage of adequate water, particularly during lean seasons and they also make available water supply to arid and semi-arid areas where rainfall is..

Features of Protozoans - Amoeba is a typical protozoa..