[Campbell Biology P.1099] Which of the following statements accurately describes the fate of ... | Practice Question

Which of the following statements accurately describes the fate of the blastopore in the developmental processes of different animal groups, as depicted in the figure?

  • A: In diploblasts like Hydra, the blastopore typically forms the anus, with the mouth developing later.
  • B: In protostomes, the mouth develops from an opening distinct from the blastopore.
  • C: In deuterostomes, including vertebrates, the mouth forms opposite the blastopore, which develops into the anus.
  • D: The fate of the blastopore is the same across all animal phyla, consistently forming the mouth.

Explanation

The figure explicitly states and illustrates the different fates of the blastopore: in diploblasts like Hydra , it forms the gastrovascular cavity opening; in protostomes like Planaria , it forms the mouth; and in deuterostomes like sea urchins and vertebrates , the mouth forms opposite the blastopore, which becomes the anus. Option C accurately reflects the deuterostome fate.