Which of the following sponge is very beautiful, delicate, siliceous sponge appear to be made of glass framework?
a) sycon
b) euplectella or venus sponge
c) leucoselenia
d) spongilla
Subkingdom Eumetazoa:
Animals
of grade radiata have radial symmetery; which of the following are included in
this grade?
a) mollusk
b) arthropoda
c) platyhelminthese
d) coelenterata or cnideria
Why the animals of phylum coelenterata are known as cnidarians? It is because of the ……..
a) pinacocytes
b) cnidocytes
c) choanocytes
d) osteocytes
Explanation: cnidocytes give rise to nematocyst (special stinging cells)
Coelenterates are exclusively……..
a) areal
b) aquatic
c) terrestrial
d) sub-tropical
Explanation: majority live in marine environment but some live in fresh water
Coelenterates have……..organization in which the cells are arranged in to tissues and organs.
a) diploblastic
b) triploblastic
c) monoblastic
d) ablastic
Explanation: the outer layer is ectoderm while the inner layer is endoderm
