December 18, 2014

Jr Intermediate Zoology Short Answer Questions for Telangana and AP Students

Q: Write salient features of anthozoans.
A: Anthozoa is one of the classes of phylum cnidaria.
Anthozoans are commonly called seaanaemones.
They are sedentary (only polypoid forms).
Coelenteron is divided into chambers by vertical partitions called mesenteries.
Cnidocytes are present in ectodum and endoderm.
Germ cells are derived from endodum. eg: Adamsia, Gorgonia, Pennatula

Q: What are the chief characters of crustaceans?
A: Crustacea is one of the classes of phylum Arthropoda.
Crustaceans are aquatic arthropods.
Body is divisible into cephalothorax and abdomen.
Cephalic appendages include two pairs of antennae, one pair of mandibles and two pairs of maxillae.
Respiratory organs are gills and excretory organs are green glands / antennary glands.
Typical larva is naupleus. eg: Palaemon, Daphnia.

Q: What are the features peculiar to Ratitae birds? Give two examples.
A: Ratitae includes the modern fightless birds.
They exhibit discontinuous distribution.
Wings and flight muscles are reduced.
Sternum is raft like & without keel.
Furcula, syrinx, preen glands etc. are absent.
Male birds have penis.
Hatchlings are precocial. eg: Struthio camelus, Dromaeus.

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