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Q.

Which of the following statements are true for the phylum Ctenophora?
a. Cnidoblasts are used for anchorage, defense and for the capture of prey.
b. Digestion is extracellular and intracellular.
c. Polyp and medusa stages alternate with each other during life cycle.
d. Reproduction takes place only by sexual means.

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a

(b) and (d)

b

(a) and (c)

c

(a), (b) and (d)

d

(a), (b) and (c)

answer is A.

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Detailed Solution

In organisms of the phylum Ctenophora, digestion is both extracellular and intracellular. Reproduction takes place only by sexual means.

Cnidocytes and metagenesis (alternation of polyp and medusa stages) are the characteristic features of the phylum Cnidaria.

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Which of the following statements are true for the phylum Ctenophora?a. Cnidoblasts are used for anchorage, defense and for the capture of prey.b. Digestion is extracellular and intracellular.c. Polyp and medusa stages alternate with each other during life cycle.d. Reproduction takes place only by sexual means.