Nematocysts are expelled when the
A) osmotic pressure reaches 140 atmospheres.
B) hydrostatic pressure exceeds the osmotic pressure.
C) internal hydrostatic pressure increases when water enters.
D) cnidocil stimulates the cnidocyte to decrease hydrostatic pressure and increase osmotic pressure.
E) None of the choices is correct
Correct Answer:
Verified
Q9: Digestion in hydra is
A)intracellular only.
B)extracellular only.
C)both extracellular
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
Q15: How does Hydra reproduce sexually?
A)Separate male polyps
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.
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