alleryOn the basis of which structure has the animal kingdom traditionally been divided into non-chordates and chordates?
ABody symmetry
BExoskeleton
CNotochord
DNumber of germ layers
Answer & Solution
Correct answer: C. Notochord
1. The traditional split rests on one supporting structure.
2. Presence or absence of the notochord separates chordates from non-chordates.
3. Rule out body symmetry: it is a criterion of the newer system, not the chordate split.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology Part 2, Ch 6 "Animal Classification", p.71_
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