Question

Examine the figure of diploblastic (i) and triploblastic (ii) organisation in animals given below and identify the parts labelled A to D.

• A. A - Mesoglea, B - Ectoderm, C - Endoderm, D - Mesoglea
• B. A - Endoderm, B - Mesoderm, C - Mesoglea, D - Ectoderm
• C. A - Mesoderm, B - Mesoglea C - Ectoderm, D - Endoderm
• D. A - Ectoderm, B - Endoderm C - Mesoglea, D - Mesoderm

Answer 1

The correct option is D A - Ectoderm, B - Endoderm C - Mesoglea, D - Mesoderm

Diploblastic animals have two germinal layers, i.e, ectoderm (A) and endoderm (B) during embryonic development, e.g., poriferans. In diploblastic animals, an undifferentiated layer named mesoglea (C) is present between the ectoderm and endoderm.
Triploblastic animals have three germinal layers (ectoderm, mesoderm (D) and endoderm) during embryonic development, e.g., platyhelminthes.