Question

what is the association of different organs to perform a particular function called

Answer 1

An association of different organs that perform a particular function in an organism is called an organ system.

For example, the Gastrointestinal tract in human beings is an organ system.

The gastrointestinal tract digests the food, extracts and absorbs the energy and nutrients and expels the waste as fecal matter.

Answer 2

The association of different organs to perform a particular function called the organ system.

This follows,

Cell -> Tissue -> Organ -> Organ system.

The best example it is of intestine, where the duodenum, jejunum, ileum all are responsible for the same function of digestion.