Question

Choose the correct answers from the alternatives given.
Which of the following does not pertain to a deuterostome?

• A. Blastopore is associated with the anus
• B. Spiral cleavage
• C. Enterocoelom
• D. Echinoderms and chordates

Answer 1

The correct option is B Spiral cleavage

In deuterostomes, the first opening (the blastopore) becomes the anus. There are three major clades of deuterostomes, the Chordata (vertebrates and their kin) Echinodermata (starfish, sea urchins, sea cucumbers, etc.). They also have enterocoelom where it forms the archenteron and fold/pinches from endoderm and deuterostome is not related with spiral cleavage as most deuterostomes display indeterminate cleavage.

So, the correct option is 'spiral cleavage'.