science 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..

Falling Objects and Acceleration due to Gravity - 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 gr..

Initial velocity (u) = 0 Time taken (t) = 6 seconds Acceleration due to gravity (g) = 9.8 m/s 2 We make use of second equation of motion h = 0 + 4.9 x 36 h = 176.4 m 03. A stone projected vertically upward, takes 5 seconds to reach the highest point. What is the initial velocity of ..

Villi are finger-like projections in the small intestine. Each villus is made up of connective tissue and smooth muscles. The villi are lined by a single layer of thin walled epithelial cells through which the absorption takes place. The fats are absorbed into the lymphatic system. In th..

Units of Nervous System - 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 fib..

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..

Water is a unique and remarkable compound, essential to all forms of life. Human beings and the flora and fauna cannot survive without water on this planet. A large amount of life on this planet is aquatic based i.e., can only survive in water. It is the most abundant substance after air in the ea..