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.
Correct Answer: A
Solution :
[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 possesses both medusa and polyp stage in its life cycle, but the sea anemones do not have the medusa stage and spend the life cycle as polyps only.
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