Record your results. Your teacher may provide you with toothpicks that contain the natural chemoattractant from the exudate from archegonia. Alternatively, you may prepare these in laboratory following instructions from your teacher. Test these as above and record your results. Figure 2a .
Proper technique is important.
Gently and briefly touch the end of the toothpick to the surface of the sperm suspension. The size of the drop of suspension is exaggerated to show detail. Figure 2b . You may have observed a very weak response by the sperm to the control toothpick. Typically, a very slight response can be observed even for the control toothpick.