Question Detail

ZOO 102 Foundations of Animal Systematics and Phylogeny Objective Question
Take CBT

Question

Echinoderms, such as sea stars, are classified as bilaterally symmetrical despite being radially symmetrical as adults. Why?
Options
A They have two germ layers
B Their adult forms are actually asymmetrical
C Their larval stages exhibit bilateral symmetry
Correct Answer
D They lack a true coelom
Correct Answer

Option C is the correct answer.

Detailed Explanation

Echinoderms exhibit 'secondary radial symmetry.' They are classified as bilaterally symmetrical because their larval stages are bilateral, and they evolved from bilateral ancestors.

Hint

Look for the term 'secondary radial symmetry'.

Question Info

Course: ZOO 102
Topic: Foundations of Animal Systematics and Phylogeny
Type: Objective
Difficulty: Not specified
Question 200 of 737
Previous Course Details Next