An experiment in shown to
find out whether
,
and
Find about a dozen of earthworms by digging in moist soil. Place the worm in a large styrofoam cup that holds some soil.
Divide a large shoe box into three parts by taping pieces of cardboard across the box, as shown in the figure above. The cardboard dividers should not touch the bottom of the box. Leave about one inch gap between the cardboard and the bottom of the box so that the worms can crawl under the cardboard. Then use scissors to cut square openings in the lid about 3 inches on a side above each of the two end compartments.
Tape clear plastic wrap over one opening and several layers of red cellophane or clear red plastic over the other opening. Cover the bottom of the box with moist paper towels.
Then put a few earthworms in each compartment. Place the box near a window so that light can enter the two end compartments.
Questions: Where are the earthworms after several hours? Are they still evenly distributed among the three compartments or are more in one compartment than another? Is there any evidence that earthworms respond to light? If there is, do they seem to be attracted to light or repelled from it? Do they respond differently to red light than to ordinary white light?
Answer:
