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Regarding Diploblastic & Triploblastic Organisation : Match the following and choose the most appropriate option:

A. diploblastic animals 1. ectoderm
B. triploblastic animals 2. endoderm
C. undifferentiated layer 3. Coelenterates
D. germinal layers 4. mesoglea
5. mesoderm
6. platyhelminthes to chordates

( A ) A-1,2,3; B-1,2,5,6; C-5; D-1,2
( B ) A-1,2,3,4; B-1,2,5,6; C-4; D-1,2,5
( C ) A-1,2,3; B-1,2,5,6; C-4; D-5
( D ) A-1,2,6; B-1,2,5,3; C-4; D-5

1 Answer

(B) is the right answer.

Diploblastic and Triploblastic Organisation : Animals in which the cells are arranged in two embryonic layers, an external ectoderm and an internal endoderm, are called diploblastic animals, e.g., coelenterates. An undifferentiated layer, mesoglea, is present in between the ectoderm and the endoderm.Those animals in which the developing embryo has a third germinal layer, mesoderm, in between the ectoderm and endoderm, are called triploblastic animals (platyhelminthes to chordates).
answered Apr 2, 2014 by pady_1