Question

What are known as sea walnuts or comb jellies ?

• A. Cnidarians
• B. Poriferans
• C. Ctenophores
• D. Platyhelminthes

Answer 1

Answer:

C. Ctenophores

Phylum – Ctenophora:

• Ctenophores, commonly known as sea walnuts or comb jellies 
• They are exclusively marine, radially symmetrical, diploblastic 
• Organisms with tissue level of organisation.
• The body bears eight external rows of ciliated comb plates, which help in locomotion
• Digestion is both extracellular and intracellular.
• Bioluminescence (the property of a living organism to emit light) is well-marked in ctenophores. 
• Sexes are not separate. Reproduction takes place only by sexual means. Fertilisation is external with indirect development
• Examples: Pleurobrachia and Ctenoplana