Question

Consider the following features:

A. Bilateral symmetry
B. Triploblastic
C. Coelomates

Select the correct group of phyla which exhibits all the above mentioned characteristics.

• A. Annelida, Mollusca, Arthropoda
• B. Porifera, Cnidaria, Ctenophora
• C. Platyhelminthes, Annelida, Mollusca
• D. Cnidaria, Platyhelminthes, Aschelminthes

Answer 1

The correct option is A Annelida, Mollusca, Arthropoda

Porifera - Asymmetrical, cellular level of organisation, acoelomates

Cnidaria and Ctenophora - Radial symmetry, diploblastic, acoelomates

Platyhelminthes - Bilateral symmetry, triploblastic, acoelomates

Aschelminthes - Bilateral symmetry, triploblastic, pseudocoelomates

The phyla Annelida, Arthropoda, Mollusca, Echinodermata, Hemichordata and Chordata exhibit bilateral symmetry. They are triploblastic and are eucoelomates.