A scientist investigated the nature of the sexual attraction between male and female moths - VCE - SSCE Biology - Question 13 - 2009 - Paper 1

The hypothesis is best answered by option B. The experimental setup indicates that the male moth is responding to the chemical signal emitted from the female moth, suggesting that it produces a chemical that elicits an electrical response in the male's antenna. This is demonstrated by the setup where molecules extracted from the female moth's reproductive organs were blown over the antenna of the male moth, indicating a direct involvement of chemical signaling in their attraction.