Do nematodes have organ-level organisation? Some introductory biology books state that nematodes have a pseudocoelom. So, they have a false body cavity. So, does it also mean that they have organ level body organisation?

In Fig.1 is shown the body plan of a round worm:

![nematode](
Fig. 1. Nematode. source: University of Illinois

You ask whether there is an organization in terms of organs; an **organ** is:

> A group of tissues that perform a specific function or group of functions;

A **tissue** is:

> An aggregate of cells in an organism that have similar structure and function;

As you can see in Fig. 1, there are clearly organs present, including a mouth, pharynx, reproductive organs, among others. They fulfill different tasks and contain various tissues, each dedicated to specific functions. Hence, they fulfill the definitional requirement of being _organs_.