some important definitions

Water pollution can be point source or non - point source. That is, it can be caused near the source of pollution or where source of pollution is sometimes far away from source. Nature also contributes to water pollution besides human activities. The concentration of pollutants is generally..

Scientists connected with improvement of crop varieties are called Plant Breeder..

Imbibition is the initial step in seed germination. Imbibition causes swelling of seeds and results in the breaking of testa. Imbibition is dominant in the initial stage of water absorption by roots. The water moves into ovules which are ripening into seeds by imbibition..

Substance Formula Hydrogen H 2 Oxygen O 2 Nitrogen N 2 Chlorine Cl 2 Bromine Br 2 Iodine I 2 Water H 2 O Ammonia NH 3 Methane CH 4 Ethane C 2 H 5 Benzene C 6 H 6 Magnesium oxide MgO Calcium..

Sodium belongs to Group I in the periodic table. This group is otherwise known as the alkali metals group. Since the atomic number of sodium is 11, its electronic configuration is 2,8,1. Sodium easily loses the lone electron to attain the stable configuration of neon. Therefore alkali metals ..

Absolute alcohol or anhydrous alcohol (100% alcohol) is prepared by adding a little benzene to the rectified spirit followed by distillatio..

The various contributing structures should have the same arrangements of structures but may differ only in electronic arrangement..

Some common terms, which are frequently used in the discussion of energetics need to be kno..

Actually speaking, natural food substances are various forms of chemicals. For e.g., rice is a carbohydrate. Fruits contain carbohydrates and acids like citric acid. Vegetables contain proteins (amino acid blocks) and vitamins. Besides these, chemicals are also used as preservatives for canne..