Zoology CSS Paper I 2005




NOTE: Attempt FIVE questions in all, including question No. 7 which is COMPULSORY. Select at least TWO QUESTIONS from each of the SECTIONS ‘I’ AND ‘II’. All questions carry EQUAL marks.


  1. (a) Write a brief account on conjugation in protozoa.
    (b) Porifera is a group falling at just above the colonial level of organization,comments.
    (c) “Corals are distributed over a wide range,yet coral reefs are present in selected areas”.Discuss.

  2. (a) Parasitism leads to the development of some characters and withdrawal of some other characters. discuss the statement with reference to platyhelminthes.
    (b) Write a brief account of shell in mollusca.
    (c) water vascilar system is the life line in Echinodermata.Comment the statement:

  3. write notes on the following:
    (a) Metameric segmentation (b) Respiration in Arthopodes (c) Pseudocoelom d) Enterocoelomates


  1. (a) Discuss retrogressive metamorphosis with reference to Ascidians.
    (b) “Amphioxus is an ideal chordate”.Discuss the statement.

  2. (a) Skeleton in petromyzon is at very initial stage of development. Justify the statement.
    (b) Heat gradually evolved into a more efficient pumping organ in different chordate groups.” Explain the statement.

  3. (a) Write an essay on migration in birds, with special reference to Pakistan.
    (b) Discuss the different type of eggs found in different chordate groups.

Compulsory Question

  1. Write only the correct answer in the answer book.Do Not reproduce the question.

  2. Coelom is the body cavity originating from
    (a) ectoderm (b) mesoderm (c) endoderm (d) None of these

  3. Cytopharynx is the structure present in
    (a) Amoeba (b) paramecium (c) Euglena (d) foraminifera (e) None of these

  4. Gemmules are the reproductive structures produced in
    (a) sponges (b) Annelids (c)Arthropods (d) coelentrates

  5. Comb plates are very specific structures of
    (a) coelentrates (b) Arthropoda (c) ctenophora (d) None of these

  6. nerve net is present in coelentrates at
    (a) in endodermis (b) below upper epidermis (c)in mesoglea d) not present in coelentrates

  7. Circulatory system in insects is
    (a) Closed type (b) open type (c) lymphic type d) All of these

  8. silk is produced by silkworm
    (a) larwa (b) adult (c) pupa (d) All of these

  9. The basic function of a flame cell is
    (a) excetion (b) osmoregulation (c) digestion (d) None of these

  10. The scale in fishes are
    (a) ectodermal (b)endodermal (c) mesodermal d) different in different fishes

  11. The neck of a camel has vertebras:
    (a) 14 (b) 9 (c) 7 d) 20 (e) None of these

  12. Spiders are Arachnids and they have legs
    (a) 6 (b) 8 (c) 9 (d) None of these

  13. Gill slits in chordates are present in
    (a) mouth (b) pharynx (c) oesophagus d) All of these

  14. Birds are flying and have ovaries
    (a) one on right side (b) both on right and left side (c) one on any side d) one on left side

  15. Adult echinoderm has symmetry
    (a) Bilateral (b) radial (c) both a and b (d) None of these

  16. The typical characters of all mammals is
    (a) mammary glands (b) brain (c) hair d) All of these

  17. Mouth in shark is located
    (a) dorsal (b) ventral (c) anterior end (d) None of these

  18. The number of ribs in frog are
    (a) 4 (b) 6 (c) 8 (d) None of these

  19. Earthworm are dissected from side
    (a) Dorsal (b) ventral (c) both a and b d) lateral

  20. Duck billed platypus is a
    (a) Bird (b) placental mammal (c) monotreme d) Marsupial

  21. Silver fish is a member of
    (a) pisces (b) insects (c) echinodermata (d) None of these


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