Question

Identify (1), (2) and (3) from the given table.

$\begin{array}{ccc}Phylum& Germlayer& Bodycavity\\ \text{(1) \_\_\_\_\_\_\_\_\_\_}& \text{Triploblastic}& \text{Acoelomates}\\ \text{Aschelminthes}& \text{Triploblastic}& \text{(2) \_\_\_\_\_\_\_\_\_\_}\\ \text{Annelida}& \text{(3) \_\_\_\_\_\_\_\_}& \text{Eucoelomates}\end{array}$

• A. (1) Platyhelminthes, (2) Pseudocoelomates, (3) Triploblastic
• B. (1) Porifera, (2) Pseudocoelomates, (3) Triploblastic
• C. (1) Platyhelminthes, (2) Eucoelomates, (3) Triploblastic
• D. (1) Porifera, (2) Acoelomates, (3) Diploblastic

Answer 1

The correct option is A (1) Platyhelminthes, (2) Pseudocoelomates, (3) Triploblastic

In the animal kingdom, different phylum have different body characteristics. For example,

• Phylum Platyhelminthes - The animals belonging to this phylum are triploblastic i.e., they have 3 germ layers - Ectoderm, endoderm and mesoderm and they lack body cavity hence are called acoelomates.
• Phylum Aschelminthes - The animals belonging to this phylum are triploblastic but they have a body cavity lined by patches of mesoderm. Thus they are considered as psuedocoelomates.
• Phylum Annelida - The animals belonging to this phylum are triploblastic with true body cavity (eucoelomates).