In this article we will discuss about the evolution of stele in a plant. Stele (= Greek word meaning a column) can be defined as the unit of vascular system that is made up of xylem, phloem, interfascicular tissues, medullary rays, pericycle and pith (if present). The term stele refers to the central core of plant axis and is restricted [...]
In this article we will discuss about:- 1. History of Plant Breeding 2. Origin and Evolution of Crop Plants 3. Scope and Objectives. History of Plant Breeding: The process of plant breeding is assumed to be initiated nearly 7000 years ago with the beginning of human civilization. Bringing a wild species under human management as the source of food which [...]
The process of evolution of different species starting from a point in an geographical area and finally radiating to other areas of geography is called adaptive radiation. Examples of adaptive radiation are: 1. Darwin's Finches: Darwin observed an amazing diversity of creature in Galapagos Islands. They represented one of the best examples of adaptive radiation. Of all the varieties of [...]