Animal Kingdom Question 29
29. What is true about all sponges without exception?
(a) They are all marine
(b) They have flagellated collar cells
(c) They have a mixed skeleton consisting of spicules and spongin fibres
(d) They reproduce only asexually by budding
Show Answer
Answer : b
Hints & Solutions
(b) Sponges are marine with the exception of family spongilidae, the members of which occur in fresh water e.g. Spongilla. Their endoskeleton is made of either spicules or spongin fibres or both. Sponges reproduce asexually by fragmentation or by budding or through gemmules and reduction bodies. Sponges also exhibit sexual reproduction.
