CBSE Class 11-science Biology Porifera, Coelenterata, Ctenophora

• phylum annelida silent features
• Bioluminescence is prominent in the phylum * 1 point a) Porifera b) Platyhelminthes c) Ctenophora d) annelida
• Note on sexual reproduction in sponges  
• what is hectocotylus arm?  
• Name the cells which line the spongocoel in Sycon.  
• State any two examples of phylum Coelenterata.
• What type of digestion is seen in the members of phylum Porifera?
• Name the cnidarian which exhibits alteration of generation.  
• Define bioluminescence.
• Write the scientific name of the freshwater sponge.

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