Select the correct statements.
a) Platyhelminthes are triploblastic, pseudocoelomate and bilaterally symmetrical organisms.
b) Ctenophores reproduce only sexually and fertilisation is external.
c) In sponges, fertilisation is external and development is direct.
d) Ctenophores are exclusively marine, diploblastic and bioluminescent organisms.
e) In echinoderms, larvae are radially symmetrical but adults are bilaterally symmetrical organisms.
Choose the correct answer from the options given below.

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a, b and d only

c, d and e only

b and d only

b, c and d only

answer is B.

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Detailed Solution

Platy helminthes are triploblastic, acoelomate and bilaterally symmetrical organisms.

In sponges fertilization is internal and development is indirect.

In echinoderms larvae are bilaterally symmetrical but adults are radially symmetrical organisms.

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