12th science derivative

Question: What is alcohol? What is the general formula of alcohol? Answer: Alcohol is a derivative of alkane, obtained by replacing one 'H' atom of alkane by a - OH group. The general formula of alcohol is C n H 2n+1 O..

Energy - Fuel wood, agricultural waste and cow dung (gobar), form the major sources of energy for rural India and most of the urban Indian population consumes energy from coal, petroleum, natural gas (CNG), hydel power (hydroelectricity), sun, wind and nuclear power. At present, India produces 97,8..

If the resistors are connected in parallel, the reciprocal of the equivalent resistance is equal to the sum of the reciprocals of all the individual resistances. This result can be generalised for any n resistors. From the above derivations we find that if we want to increase the resis..

Johannes Kepler derived three laws, which govern the planetary motion: The orbit of a planet is an ellipse with the Sun at the one of the foci The line joining the planet and the Sun sweeps equal areas in equal intervals of time The cube of the mean distance of a planet from the ..

Permanent tissues are derived from meristematic tissues. They have lost the power of dividing, having attained their definite form and size. In their earlier stages the cells are more or less similar in structure but slowly they become specialized and form permanent tissues. They can be c..

Materials to be transported include digested food, respiratory gases, hormones, excretory products, etc. The digested food includes sugars like glucose, amino acids, fatty acids and their derivatives. Blood which is the vascular tissue in man is over 90% water. Thus, only the water-solub..

Permanent Tissues - Permanent tissues are derived from meristematic tissues. They have lost the power of dividing, having attained their definite form and size. In their earlier stages the cells are more or less similar in structure but slowly they become specialized and form permanent ti..

The Indian fauna includes variety of animal life such as mammals, birds, reptiles, fishes, insects etc i.e. about 800 species of mammals, 2000 species of birds, 420 species of reptiles, 2000 species of fish, 50,000 species of insects, 4000 species of molluscs (Source K.C.Agarwal, 1998). The animals..

Meiosis - Meiosis is a cell division occurs in reproductive cells (gametes). The male gamete is known as the sperm in animals and the female gamete is known as the ovum (egg). These gametes, after they are formed, have no future unless they unite to form a zygote, which then grows into an adult org..