what is differentiation from biological point of view>?

Answer 1

Differentiation in biological sense is usually to do with the cells. When a new cell is born, it doesn't know what functions it must perform, until the essential cellular organelles, special morphology, enzymes and proteins are installed in the cell. And these processes occur mainly because of the DNA molecule, which consists of predisposed blue print of instructions to be given to the cell, inside the nucleus - the center for all cellular activities. This way the cell gets differentiated and understands its resposibilities and performs the particular functions. This cell diffentiation is applicable to both plant tissues and animal tissues especially in the embryonic stage. The plant cells divide especially in the growing parts consisting of undifferentiated mass of meristematic cells, which later differentiates and forms different types of tissues that we study in plant histology. And almost the similar process of cell differentiation occurs in embryonic stage of an animal.
I think this is enough and has hopefully answered your question

Answer 2

Cellular differentiation is a concept from developmental biology describing the process by which cells acquire a "type". The morphology of a cell may change dramatically during differentiation, but the genetic material remains the same, with few exceptions.

A cell that is able to differentiate into many cell types is known as pluripotent. These cells are called stem cells in animals and meristematic cells in higher plants. A cell that is able to differentiate into all cell types is known as totipotent. In mammals, only the zygote and early embryonic cells are totipotent, while in plants, many differentiated cells can become totipotent with simple laboratory techniques.

http://en.wikipedia.org/wiki/Cellular_differentiation

Answer 3

Every cell in the body inherits identical genetic information in its DNA, but no one cell uses all of it. During "diffeentiation", only selected genes are activated, transforming the cell into a specialized unit. In most cases, the final shape and size of the cell and its contents reflect its function.