General characteristic features of phylum Porifera
Poriferans (Pore bearing animals) are the first multicellular animals. They are commonly called sponges because of their appearance. They are aquatic, mostly marine, rarely fresh […]
Biology
Differences between RNA and DNA
S.N. Ribonucleic acid (RNA) Deoxyribonucleic acid (DNA) 1. It contains ribose sugar. It contains deoxyribose sugar. 2. It lacks Thymine but has Uracil. It lacks […]
Differences between Dicot and Monocot stem
S.N. Dicotyledonous stem Monocotyledonous stem 1. Internally, the stem is differentiated into epidermis, hypodermis, cortex, endodermis, pericycle, stelar system and pith. Internally, the stem is […]
Scope of biology
Biology: The science which deals with the study of structure, organization, life processes, interactions, origin and evolution of living organisms is called biology. Aristotle is […]
How human beings came on earth?
Origin and evolution of man: Man is a mammals and supreme among all other animals which exist today. Central Asia is the place of origin […]
Differences between frog and toad
S.N. Frog Toad 1. Frog lives in or near water resources. Toad lives in dark, shady place in grass or under stones and leaves. 2. […]
Some salient features of class Mammalia
Natural history: Mammals are primarily terrestrial vertebrates but few like whales and dolphins are aquatic. They are the most dominant animals on earth and have […]
Characteristic features of class Amphibia
Natural history: The amphibians (the vertebrates with dual life) were the first vertebrates to invade land, but they aren’t fully dependent to terrestrial life. They […]
Structure and functions of bones
Gross anatomy of a typical long bone: Bone is a specialized connective tissue that has the strength of a cast iron and the lightness of […]
The appendicular skeleton of human body
Appendicular skeleton is composed of bones which lie on the lateral sides of the mid axial line (Axial skeleton) of our body and consists of […]