alleryAn echinoderm shows radial symmetry as an adult but a different symmetry as a larva. What is the larval symmetry?
AAsymmetry
BRadial symmetry
CBilateral symmetry
DSpherical symmetry
Answer & Solution
Correct answer: C. Bilateral symmetry
1. Adult echinoderms are radially symmetrical.
2. In the larval stage they instead show bilateral symmetry.
3. Rule out radial symmetry: that is the adult condition, not the larval one.
4. Asymmetry would mean no plane of equal halves, which is not described.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology Part 2, Ch 6 "Animal Classification", p.80_
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