Question

Which among the following characters match with ctenophora.
A. Coelomate
B. Bioluminescence
C. Attack with hypnotoxins
D. Calcareous spicules

Answer 1

Hint: Ctenophora comprises the phylum of invertebrate animals. They are aquatic animals and live in marine water worldwide. These organisms swim with the help of cilia. They are the largest animals that swim with the help of cilia.

Complete Answer:
- The bodies of ctenophores consist of a mass of jelly with two celled thick layers outside and an internal layer.
- The members of phylum Ctenophora consist of a wide range of body forms.
- Almost all the ctenophores are the predators.
- They prey various animals that range from the microscopic larvae and rotifers to the adults of the small crustaceans.
- They have a soft and gelatinous body.
Example – Pleurobrachia, Bolinopsis, Cestrum, etc.

Characteristics of ctenophores:
- Ctenophores are the free swimming, marine and solitary animals. They have the bilateral symmetrical body
- Ctenophores lack sexual reproduction and alternation of generation. The body of ctenophores is acoelomate, triploblastic.
- Their digestive system consist of mouth, stomadaeum, complex gastrovascular canals and 2 aboral anal pores.
- They exhibit bioluminescence which means they emit some light as a result of some chemical reactions occurring in the body. They are also called sea walnuts or comb jellies.

Hence, option B is the correct option for this question.

Note: Ctenophores are more complex than the sponges but less complex than that of the bilaterians. Ctenophores have two layers that sandwich a third layer which is called a mesoglea. The ctenophores body form range includes the flattened, deep seas plactyctenids, the coastal nberoids, etc.