Question

Define cellular level of organisation, tissue level of organisation and organ level of organisation?

Answer 1

Body organization :

1. Body organization is one of the criteria based on which animals have been further divided into phyla.
2. Body organization can be cellular, tissue-level, organ-level, or organ system-level.

Cellular level of organization:

1. In the cell aggregate body plan, the body consists of a group of cells with almost no differentiation and they are not organized into tissues or organs.
2. For example, sponges.

Tissue level of organization:

1. At the tissue level of organization, all such cells performing similar functions group together to form a unit called tissue.
2. Groups of these cells join together to form a tissue, and this kind of organization is seen in some animals, where the tissues perform specific functions.
3. Hydra and jellyfishes have tissue levels of an organization.

Organ level of organization:

1. Several tissues also join together to form organs that perform specific functions, and this type of organization is called an organ level of organization.
2. Several organs join together to form an organ system like the respiratory system, circulatory system, etc.
3. Such a level of organization is said to be the organ system level of organization.