Most of the hydrozoans are colonial marine animals with both an asexual polyp and a sexual medusa stage in their life cycle.
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Q7: Some nematocysts do not inject poison.
Q8: Nematocysts are found in some cells lining
Q9: The central nervous system of cnidarians includes
Q10: Hydra reproduces asexually by means of
A)buds.
B)nematocysts.
C)gland cells.
D)gametes.
Q11: The freshwater Hydra has a medusa stage
Q13: The radiate animals represent the tissue-organ level
Q14: The class of cnidarians with the most
Q15: The anthozoans include the marine sea anemones
Q16: A common characteristic of cnidarians is
A)an osculum.
B)dimorphism
Q17: Cnidarians are widespread in marine habitats,but there
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