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Q: Hydra is an example of which of the following phylum?
  • A. Platyhelminthes
  • B. Nematoda
  • C. Coelenterata
  • D. Porifera
Correct Answer: Option C - Hydra belongs to the phylum Coelenterata or Cnidaria, which includes animals that have radial symmetry, a gastro vascular cavity, and stinging cells called nematocysts for capturing prey. They have very simple tissue organization, with only two layers of cells. The phylum Coelenterata includes a diverse group of aquatic animals and some notable examples are jelly fish, sea anemones, corals, physalia, sea pens, sea whips, and adamsia.
C. Hydra belongs to the phylum Coelenterata or Cnidaria, which includes animals that have radial symmetry, a gastro vascular cavity, and stinging cells called nematocysts for capturing prey. They have very simple tissue organization, with only two layers of cells. The phylum Coelenterata includes a diverse group of aquatic animals and some notable examples are jelly fish, sea anemones, corals, physalia, sea pens, sea whips, and adamsia.

Explanations:

Hydra belongs to the phylum Coelenterata or Cnidaria, which includes animals that have radial symmetry, a gastro vascular cavity, and stinging cells called nematocysts for capturing prey. They have very simple tissue organization, with only two layers of cells. The phylum Coelenterata includes a diverse group of aquatic animals and some notable examples are jelly fish, sea anemones, corals, physalia, sea pens, sea whips, and adamsia.