Chapter 34, Problem 4TY

In an experiment to test the function of statocysts, researchers replaced the statoliths of a crayfish with iron filings and then held a magnet directly above the animal’s head. Normally, statoliths sit at the bottom of a statocyst unless an animal moves or turns over. What do you think happened in response to the magnet?

1. The animal turned in circles.
2. The animal flipped itself over.
3. The animal began moving backwards.
4. The animal fell over onto its side.