-Suchismita, Subject matter Expert at edumarz
Solution: The organism which has a simple form of cellular organisation is known as primitive. That means there’s no division of labour. All functions can be done in one cell for survival. There are no organs or organ systems.
Primitive forms of organisms are the oldest form of organisms existing on the earth. As an organism evolves the complexity of that organism increases. There will be more specific parts or divisions for functioning different functions of the body. As the organism evolves the body design of the organism changes.
Such as from unicellular to multicellular (not having perfect division of labour) to the advanced form such as mammal ( having division of labour).
Advanced form of organism means having particular organs or organ systems to look after the functions of the cell. They are advanced in every form which has the ability to think, to rationalise , to talk and many more activities.
Humans are the most advanced form of organism existing on the earth. They have different organs to perform different functions or organ systems also. Such as heart is only specified for circulation of blood to the body, lungs are specified for exchange of gases, kidneys are involved in filtering the waste material from the blood and many more.
This is the way we can classify the primitive and advanced form of organisms.