Q: Write salient features of anthozoans.
A: Anthozoa is one of the classes of Phylum Cnidaria.
i) Anthozoans are commonly called sea anemones.
ii) They are sedendary (only polypoid forms).
iii) Coelenteron is divided into chambers by vertical partitions called mesenteries.
iv) Cnidocytes are present in ectoderm and endoderm.
v) Germ cells are derived from endoderm.
Eg: Adamsia, Gorgonia, Pennatula
Q: What are the chief characters of crustaceans?
A: Crustacea is one of the classes of Phylum Arthropoda.
i) Crustaceans are aquatic arthropods
ii) Body is divisible into Cephalothorax and abdomen.
iii) Cephalic appendages include two pairs of antennae, one pair of mandibles and two pairs of maxillae.
iv) Respiratory organs are gills and excretory organs are green glands / antennary glands.
v) Typical larva is naupleus.
Eg: Palaemon, Daphnia
Q: What are the features peculiar to Ratitae birds? Give two examples.
A: i) Ratitae includes the modern fightless birds.
ii) They exhibit discontinuous distribution.
iii) Wings and flight muscles are reduced.
iv) Sternum is raft like & without keel.
v) Furcula, syrinx, preen glands etc. are absent.
vi) Male birds have penis.
vii) Hatchlings are precocial.
Eg: Struthio camelus, Dromaeus
Q: Name the following animals.
a) Limb less amphibian
b) The largest of all living animals
c) Flying fox d) National Animal of India
A: a) Icthyophis b) Balaenoptera
c) Pteropus d) Panthera tigris
Q: Compare and contrast the cartilagenous
fishes and bony fishes.