Asexual reproduction takes place in porifera by…….
a) budding
b) gemmule formation
c) binary fission
d) both a and b
Explanation: sexual reproduction through ova and sperms
Excretion in porifera takes place by……
a) egestion
b) active transport
c) diffusion
d) exocyosis
Which of the following sponges do not have skeleton?
a) sycon
b) mykospongida
c) spongia
d) euplectella
The skeleton of sponges consists of …….
a) carbonate of lime
b) silicon in the form of spicules
c) spongin protein
d) all of these
The animals of which phylum are used during surgical operations?
a) mollusks and chordates
b) nematodes and arthropods
c) platyhelminthese
d) porifera
Explanation: because of their ability to absorb blood and other fluids
Which of the following is/are the fresh water sponges?
a) sycon
b) spongilla
c) leucoselenia
d) all of these
Explanation: the remaining two are marine water sponges
