Which of the following traits is not shared by both sea anemones and jellyfish ?
A. A medusa as the dominant stage in the life cycle.
B. Possession of a gastro vascular cavity.
C. Sexual reproduction.
D. Nematocysts present on the tentacles.
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Correct Answer : A.
Medusa and polyp are the stages in the life cycle of cnidarians. Medusa is a sexual free swimming form and polyp is asexual form. The jellyfish have both a medusa and polyp stage in their life cycle, but the sea anemones have lost the medusa stage and spend the life cycle as polyps.