Q.

How many germ layers do the phyla of Coelenterata have?

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a

2

b

1

c

3

d

4

answer is B.

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Detailed Solution

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Phylum Coelenterata characteristics:

  1. They are aquatic, mostly marine except for a few freshwater forms like the hydra.
  2. They are diploblastic animals with 2 cellular layers-outer an epidermis and an inner gastrodermis- with a gelatinous acellular mesoglea in between.
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