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A starfish can be cut into two equal halves along several different planes passing through its central axis. Which type of body symmetry does this describe?
ARadial symmetry
BBilateral symmetry
CAsymmetry
DSpherical symmetry
Answer & Solution
Correct answer: A. Radial symmetry
1. Several planes through a central axis each give two equal halves.
2. This is radial symmetry, the kind a starfish shows with its five planes.
3. Rule out bilateral symmetry: there only one plane gives equal halves.
4. Asymmetry would give no equal halves through any axis.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology Part 2, Ch 6 "Animal Classification", p.74_
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