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1Members of the phyla Protista and Cnidaria are ________.
A)absorptive heterotrophs
B)ingestive-feeding heterotrophs
C)autotrophs
D)chemotrophs


2Sponges lack tissues and organs.
A)True
B)False


3Sponges are ________, meaning that their bodies have no symmetry or pattern.
A)radially symmetrical
B)bilaterally symmetrical
C)asymmetrical


4How do sponges feed?


5Define choanocyte.


6


osculum
7


spongocoel
8


porocyte
9


amoebocyte
Answer choices:
A)the large hole in the end of a sponge through which the filtered water exits
B)mobile cell that can digest or secrete spicules
C)pores that let water into a sponge
D)the central cavity of a sponge


10Define spicule.


11Asexual reproduction in sponges includes the release of stress-resistant aggregates of amoebocytes called ________.
A)spores
B)gametes
C)gemmules
D)endospores


12What are the three classes of the phylum Cnidaria?


13Cnidarians are ________.
A)radially symmetrical
B)bilaterally symmetrical
C)asymmetrical


14Bodies of cnidarians have two cellular layers, an on the outside, an on the inside and a gelatinous between the two layers.


15What are the two basic body-plans of cnidarians?


16In cnidarians, after fertilization the zygote develops into a swimming mass of ciliated cells called ________.
A)planula
B)ephyra
C)medusa
D)mesoglea


17In cnidarians, polyps may bud immature medusae called ________.
A)planulae
B)ephyrae
C)gonozoids
D)gastrozooids


18How do cnidarians feed?


19Differentiate between cnidocytes and nematocysts.


20In cnidarians, food is pushed into a gastrovascular cavity and waste is moved out the same opening.
A)True
B)False


21The alternation form the medusa to the polyp form in cnidarians is called ________.
A)polygamy
B)budding
C)alteration of generations
D)polymorphism


22In the class Scyphozoa, the medusa stage dominates the life cycle.
A)True
B)False


23In the class Anthozoa, the medusa stage dominates the life cycle.
A)True
B)False





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