Protozoans and its classification
The word Protozoa is derived from two Greek words: protos means first; zoon means animal. They are the first animals with a protoplasmic grade of...
Modes of nutrition
Organisms obtain their food materials in different ways which are of two types generally. They are: A) Autotrophic nutrition B)...
Phylum : Coelenterata (Cnidaria), its classification and characteristics
multicellular with tissue grade of body organization. aquatic, mostly marine, few are found in fresh water. sedentary or free swimming. mostly radially symmetrical whereas few...
Five kingdom classification and features
The five kingdom system of classification was proposed by R.H Whittaker in 1969. This classification is based on following criteria: Complexity of cell structure- prokaryote...