How does Hydra reproduce sexually?
A) Separate male polyps and female polyps produce sperm and eggs,respectively,that fuse and grow into a medusa
B) The swimming medusa stages are male and female and the fertilized eggs develop into planula larvae that become Hydra polyps
C) The polyp body wall can produce both ovaries and testes that make eggs and sperm respectively
D) Hydra sperm fertilize an egg in the body wall and this starts the growth of a bud
E) Hydra do not reproduce sexually since they lost the sexual medusa stage
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Q10: The term "cnidaria" is based on the
Q11: Which of the following is NOT a
Q12: The class of radiate animals with the
Q13: The unique feature(s)of a cnidarian nervous system
Q14: Nematocysts are expelled when the
A)osmotic pressure reaches
Q16: The class Hydrozoa contains Hydra,Obelia,and
A)the Portuguese man-of-war.
B)aurelia.
C)the
Q17: Cnidarians are found most abundantly in which
Q18: Nematocysts are
A)widespread among the animal kingdom but
Q19: Hydra reproduces asexually by
A)buds.
B)nematocysts.
C)gland cells.
D)gametes.
E)gastrozooids.
Q20: The fossil record of Cnidaria is
A)about the
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