Passage IV

Certain odorants (airborne chemical compounds) can stimulate a change in the electrical activity of the olfactory neurons in the antennae of the moth Manduca sexta. The change in the electrical activity of an antenna in the presence of an odorant can be detected as an increase in the antenna’s voltage relative to its voltage in the absence of odorants. The figure below shows the average change in antennal voltage for adult female M. sexta that were exposed to each of 5 odorants at each of 4 concentrations.

23. Based on the figure, if adult female M. sexta are exposed to 5 mg/L of methyl salicylate, the average change in antennal voltage will most likely be:

Answer and Explanation

Your Answer is

Correct Answer is B

Explanation

Look at the picture, corresponding methyl salicylate, when the abscissa 1 mg/L , the corresponding ordinate is about 60; when the abscissa is10 mg/L, the corresponding vertical coordinate is about 120. So whenconcentrationis5 mg/L,voltageshould be in60-120between.