Which of the following does not pertain to a protostome

Spiral cleavage

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Blastopore is associated with the anus

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Schizocoelom

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Mouth is associated with first opening

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Solution

The correct option is B Blastopore is associated with the anus
Protosomes have spiral and determinate cleavage. Coelom is schizocoelom and is formed by splitting the mesodermal embryonic tissue. The blastopore develops into the mouth in such animals. Protostomes include the phyla Mollusca, Annelida and Arthropoda.

So, the correct option is B

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