How could you test the hypothesis that caterpillar saliva and a wound are both necessary to attract the parasitoid wasps?

Question

Quizplus · Accepted Answer

All of the above actions are necessary to test the hypothesis because each action tests a different part of the hypothesis. Slashing the corn leaves with a razor blade creates a wound, which is one of the necessary conditions for attracting the parasitoid wasps. Putting caterpillar saliva on a leaf wound tests the other necessary condition, which is the presence of caterpillar saliva. Putting caterpillar saliva on an intact leaf tests the null hypothesis, which is that caterpillar saliva alone is not sufficient to attract the parasitoid wasps.

How Could You Test the Hypothesis That Caterpillar Saliva and a Wound