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.

25. For the M. sexta exposed to an odorant concentration of 1 mg/L, what is the order of the 5 odorants, from the odorant that stimulated the least average change in antennal voltage to the odorant that stimulated the greatest average change in antennal voltage?

Answer and Explanation

Your Answer is

Correct Answer is A

Explanation

Look at the picture, when The abscissa is1 mg/L, the smallest ordinate of several substances iscaryophyllic acid, followed bylinallol, the largest ispropylacetone, so sureAThe option is correct.