Biology
NULL
Medium
Question
Alternation of generations is absent in ___________?
A
Hydra
✓ Official correct answer
B
Obelia
C
Jelly fish
D
Physalia
Community credibility
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A
Hydra
No member explanations yet for this option.
B
Obelia
No member explanations yet for this option.
C
Jelly fish
No member explanations yet for this option.
D
Physalia
No member explanations yet for this option.
Explanation
Unlike other cnidarians such as Obelia, jellyfish, and Physalia, which alternate between polyp and medusa stages, Hydra lacks a free-swimming medusa stage and therefore does not show a typical alternation of generations.