Biology 11 Chapter - 9
Diversity Among Animals - 13
1.
___ are used in buildings to absorb the sounds?
a) arthropodes
b) echinoderms
c) mollusks
d) sponges
2.
Cnidocytes are the charactristic cells of?
a) vertebrates
b) sponges
c) flatworms
d) cnidarians
3.
Cnidarians are completely?
a) terresterial
b) aerial
c) burrowing
d) aquatic
4.
Cnidarians are called so because?
a) they are sessile
b) they are marine
c) they posses cnidocytes
d) they are aquatic
5.
Which one of the following is a colonial cnidarian?
a) obelia
b) all of these
c) jellyfish
d) hydra
6.
Which one of the following is Not the charactristic of Cnidarians?
a) they have bilateral symmetry
b) they are diploblastic
c) they have radial symmetry
d) they are mostly marine
7.
The stinging cell orgenelles in the body of cnidarians are called as?
a) pinacocytes
b) choanocytes
c) nematocysts
d) cilia
8.
Nematocysts develope from?
a) choanocytes
b) mesoglea
c) cnidocytes
d) pinacocytes
9.
In cnidarians, the process in which the polyp alternates with the medusae is called as?
a) fertilization
b) blastulation
c) budding
d) alternation of generation
10.
Polyp and medusae are?
a) diploid
b) monoploid
c) triploid
d) haploid
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