Question 41 of 75
Q.Which one of the following is not correctly paired?
(a) Ctenophora - Veliger
(b) Annelida - Trochophore
(c) Porifera - Parenchymula
(d) Cnidaria - Planula
Puducherry TnboardTamil Nadu HSC First Year (DGE) Board 2019MCQ· 1mImportance★★★★★
55% · 41/75 Questions
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Start your 14-day free trial to unlock the full solution →Option (a) is the incorrectly matched pair — Veliger is the larva of Mollusca, not Ctenophora (whose larva is the cydippid larva); the other three pairs are all correct.
Many invertebrate phyla are identified in exams by their characteristic larval stage:
- Porifera → Parenchymula (and also amphiblastula in some sponges) — a ciliated larva.
- Cnidaria → Planula — a ciliated, free-swimming larva.
- Annelida (and Mollusca) → Trochophore — a top-shaped ciliated larva; in Annelida it is the trochophore larva, correctly paired here.
- Ctenophora → Cydippid larva — NOT the veliger. The veliger is specifically the larva of Mollusca (following the trochophore stage), where it develops a shell, foot, and velum. …
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