Q.

In case of poriferans, the spongocoel is lined with flagellated cells called                 [2017]

1 Oscula  
2 Choanocytes  
3 Mesenchymal cells  
4 Ostia  

Ans.

(2)

Spongocoel is the central body cavity of the sponges. It is lined by highly specialized flagellated cells called choanocytes.