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Question

Consider the following features: 
(A) Exclusively marine in nature
(B) Show extra and intra cellular digestion
(C) Only sexual reproduction occurs
(D) Development indirect
Which of the following animals has all the above mentioned features? 
  1. Cliona  
  2. Pennatula  
  3. Pleurobrachia  
  4. Adamsia  


Solution

The correct option is C Pleurobrachia  
Ctenophores, commonly known as sea walnuts or comb jellies 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. Sexes are not separate. Reproduction takes place only by sexual means. Fertilisation is external with indirect development. Examples: Pleurobrachia and Ctenoplana

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