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Per NCERT, what is one of the MAJOR criteria for classifying animals — referenced in §12.6.5?
AColour of the animal
BPresence or absence of a NOTOCHORD (a flexible rod-shaped structure) — dividing animals into Chordata vs non-Chordata
CWhether the animal can fly
DWhether the animal sleeps at night
Answer & Solution
Correct answer: B. Presence or absence of a NOTOCHORD (a flexible rod-shaped structure) — dividing animals into Chordata vs non-Chordata
Per NCERT §12.6.5, notochord presence/absence is a major classification criterion. The other options are trivial.
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