BIOLOGY

Three pairs of salivary glands exist in man while in rabbit they are four pairs. In man, the three pairs are parotid, submaxillary and sublingual glands. They all have ducts ...

Skeleton is therefore, the hard framework on which the body is built. This hard framework may be made up of sand particles as in Arcellar (a shelled Amoeba), exoskeleton as ...

Rhesus factor in some red blood cells in some human beings was named after the rhesus monkey in which it was first discovered. Rhesus factor is an antigen present on ...

Chitin is non living and non-cellular and is secreted by the underlying epidermis. It is a protein-carbohydrate compound. It is composed of several different substances. It is really made up ...

Growth is defined as an irreversible or permanent increase in size, dry mass or weight due to the addition of living protoplasmic materials in organism. In other words, Growth is ...

There are five modifications and mechanisms of feeding associated with someorganisms. These feeding mechanisms include: 1) Absorbing mechanisms, e.g. tapeworm The tapeworm is an endoparasite which carries out parasitic feeding ...

Asexual is the type of reproduction in which new organisms are produced from a single parent without the production of gametes. The offspring called the clones are the same in ...

Reproduction is the ability of living organisms to give rise to new individuals of the same species. The purpose of reproduction is to ensure the continuity of life. Types of ...

The alimentary canal of man includes the mouth, oesophagus, stomach, duodenum, small intestine or ileum, caecum, appendix, large intestine or colon, rectum and anus. The description and importance of the ...

FACTORS AFFECTING A POPULATION A number of factors referred to as environmental resistance control the population of organisms in a particular habitat. These factors are classified as abiotic and biotic ...