What are known as sea walnuts or comb jellies ?
ACnidarians
BPoriferans
CCtenophores
DPlatyhelminthes
Answer:
C. Ctenophores
Read Explanation:
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