Bioluminescence (light emission) is most well-marked in:
APlatyhelminthes
BCtenophora (sea walnuts/comb jellies) — diploblastic with eight rows of ciliated comb plates for locomotion
CPorifera
DAschelminthes
Answer & Solution
Correct answer: B. Ctenophora (sea walnuts/comb jellies) — diploblastic with eight rows of ciliated comb plates for locomotion
Ctenophores (Pleurobrachia, Ctenoplana) — exclusively marine, radially symmetrical, diploblastic. Eight external rows of ciliated comb plates aid locomotion. Bioluminescence is a hallmark feature. Reproduction is sexual; fertilisation external; indirect development.
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