Question

The adult echinoderms are ________ and the larvae are _________.

• A. asymmetrical, radially symmetrical
• B. radially symmetrical, bilaterally symmetrical
• C. bilaterally symmetrical, radially symmetrical
• D. asymmetrical, bilaterally symmetrical

Answer 1

The correct option is B radially symmetrical, bilaterally symmetrical

The adult echinoderms are radially symmetrical and larvae are bilaterally symmetrical.
Organisms exhibiting bilateral symmetry can be cut into two identical halves in only one plane, the median sagittal plane.
Organisms exhibiting radial symmetry can be cut into two identical halves in any plane passing through the centre.
Asymmetrical organisms cannot be cut into identical halves in any plane.