First slide

Basis of Classification

Question

Which of the following organism can be cut into two equal halves in only one plane?

Easy

A

Hydra
B

Crab
C

Sponge
D

Jelly fish

Solution

If an organism can be cut into two equal halves in only one plane, it is said to be bilaterally symmetrical. Crab (Arthropoda) is bilaterally symmetrical.
Jelly fish and Hydra belong to Cnidaria and are radially symmetrical.
Sponges (Porifera) are mostly asymmetrical.

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