In Lamberti and Resh's experiment, what was the purpose of having a second grid of tiles raised 15cm above the stream bottom?
A) To prevent algae and bacteria from colonizing the tiles
B) To encourage algae and bacteria to colonize the tiles
C) To prevent Helicopsyche from colonizing the tiles
D) To encourage Helicopsyche to colonize the tiles

Question

Quizplus · Accepted Answer

The purpose of raising a second grid of tiles 15cm above the stream bottom in Lamberti and Resh's experiment was to prevent Helicopsyche, a type of caddisfly, from colonizing the tiles. This setup was likely used to study the effects of Helicopsyche presence or absence on the colonization and growth of algae and bacteria, by comparing it with tiles placed directly on the stream bottom where Helicopsyche could colonize.

In Lamberti and Resh's Experiment, What Was the Purpose of Having