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The migration path of monarch butterflies brings them from Eastern Canada to Mexico over a long, multi-generational journey. During a series of experiments in a chamber, monarchs were observed to fly in a southwest direction. When their circadian rhythms were altered by -6 and +6 hours, the monarchs flew in a southeast or northwest direction, respectively.
-Which kind of photoreceptor would you expect the butterfly to have?
A)ocelli
B)single lens eye
C)compound eye
D)eye spot
E)pupil

Question

Quizplus · Accepted Answer

Monarch butterflies have compound eyes made up of thousands of individual photoreceptor units called ommatidia. These ommatidia are sensitive to different wavelengths of light and help the butterfly detect changes in light intensity and direction, which may explain why altering their circadian rhythms affected their flight direction.

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