Multiple choice

Which of the following organisms represents the phylum whose members lack mouth and anus?

  1. Spongilla

  2. Hydra

  3. Planaria

  4. Ascaris
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A Correct answer
Explanation

Spongilla belongs to the group porifera. They are commonly known as sponges. The word ‘porifera’ means organisms with holes. These are non-motile animals attached to some solid support under water. They have holes or ‘pores’ all over the body. These lead to a canal system, which helps in circulating water throughout the body to bring in food and oxygen. The members of this phylum lack mouth and anus. 

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