Modes of Respiration. For simple animals such as sponges, jellyfish, flatworms and roundworms, respiration is primarily through diffusion of oxygen through ...

The feeding mechanisms depend on the nature of the food required as food can be obtained by the animals in different ways. Each and every mechanism for ...

Polygenic inheritance occurs when one characteristic is controlled by two or more genes. Often the genes are large in quantity, but small in effect. Examples ...

The structure of insulin consists of two short polypeptide chains chain A and chain B linked together by disulphide bridges. In mammals, including human ...

Pyramid of energy is a graphical representation of amount of accumulated energy per unit area in different trophic levels of a food chain. An energy ...

Fertilization in humans occurs in fallopian tube of the female reproductive system. It is the process of fusion of a haploid sperm and a haploid ovum to form ...

The main steps in breeding a new genetic variety of a crop are: Collection of variability:  Collection and preservation of all the different wild ...

S.F. Griffith demonstrated bacterial transformation experimentally by performing experiments on Diplococcus pneumonia. It has two distinct forms – one form ...

Lac operon consists of regulator gene, promoter gene, operatoral gene and structural gene. The E. coli bacterium carries numerous genes and these genes ...