Producers, Consumers, Decomposers

Here is a video defining what Producers, Consumers, Decomposers.

Ecosystem Game

This game allows the student to place scientific terms in various bins.  It is interactive and easy to use.  To modify this game, you could allow the student to use an online dictionary to define the term before placing it into its bin. 

http://www.neok12.com/vocabulary/Ecosystems-02.htm