Question

As per classification, which of the following groups is correct?

• A. Ascaris, Pheretima, Musca
• B. Hydra, Pteris, Euplectella
• C. Nereis, Sycon, Unio
• D. Pila, Chiton, Octopus

Answer 1

The correct option is D Pila, Chiton, Octopus

Option A: Ascaris is a nematode, Pheretima is an annelid while Musca is an arthropod.
Option B: Hydra is a coelenterate, Pteris is a pteridophyte while Euplectella is a porifer.
Option C: Nereis is an annelid, Sycon is a porifer while Unio is a mollusc.

Option D: Pila, Chiton and Octopus, are molluscs.

Organisms in options A, B and C do not have the same classification whereas, option D has organisms all belonging to the same phylum.
So, the correct answer is option B.