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The most primitive eyes developed in which of the following organisms?

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Earthworm

Octopus

Insects

Planaria

answer is B.

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Detailed Solution

The eye is a complex homologous organ to primitive eyes or photosensitive cells. It has developed in stages over generations i.e., from primitive form to more complex forms.

Planaria are simple flatworms having small eyespots that function as eyes for detecting light and also provide a survival advantage to the flatworm.

Thus, the most primitive eyes developed in Planaria.

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