The classification of insects into various orders is based on the presence or absence of wings and their venation, type of mouth parts, type of metamorphosis and characteristics of antennae and tarsi. The class Insecta has two subclasses, Apterygota, the primitive wingless insects, and Pterygota, insects with wings (although some of them may be secondarily apterous). Initially, there were 29 [...]
Tissue is a group of similar cells having a common origin that act together in the performance of a particular function. Early during development, the cells of the growing embryo differentiate into three fundamental embryonic tissues called germ layers namely ectoderm, mesoderm and endoderm. These germ layers, in turn, differentiate into different cell types and tissues that are characteristic of [...]
In this article we will discuss about:- 1. Definition of Classification 2. Components of Classification 3. Rules 4. Identification 5. Downward and Upward Classification 6. Kinds 7. Functions 8. Hierarchical Classification. Definition of Classification: A classification is generally regarded as the primary product of systematic effort, although two students hardly agree as to their concepts of classification. It is a [...]