Explain in detail the types of grades of organization.

Explanation

The various types of grades of organization are as follows:
i.Protoplasmic grade organization: It is seen in unicellular animals. Their body is composed of a single cell, which performs all functions. e.g. Amoeba, Paramoecium
ii. Cellular grade organization: It is seen in multicellular animals in which tissues are not formed. e.g. Porifera
iii. Cell-tissue grade organization: It is seen in some animals, in which cells come together to form tissues and perform different body functions, e.g. Cnidaria
iv. Tissue-organ grade organization: In this type of organization, tissues are organized to form some organs. Although, complete organs are not formed. e.g. Flatworms .
v.Organ-system grade organization: It is seen in animals in which different organs come together to form organ-systems that perform specific functions. e.g. Crab, frog, humans, etc.