51. Which of the following is a fresh water sponge? A.Sycon B.Euspongia C.Spongilla D.Pleurobrachia
Answer: Option C Solution: Spongilla is a genus of fresh water sponges, found in lakes and slow streams. Sponges of the genus Spongilla attach themselves to rocks and logs and filter the water for various small aquatic organisms. It has monaxons spicules, which are like single pointed shaft. These spicules are present in large numbers.
