CSS Zoology Past Paper 2003
Paper-I
PART-2(Subjective) 80 Marks
Attempt ONLY FOUR Questions from PART-II. (20×4)
PART-II
SECTION-I
Q. No. 2
(a) Discuss the phenomenon of autogamy with special reference to Paramecium.
(b) Give a brief overview of parasitic adaptations in Platyhelminthes.
(c) “Sponges have a diploblastic organization.” Discuss the statement.
Q. No. 3
(a) Define polymorphism and explain with reference to Coelentrata.
(b) Describe the respiratory system in insects.
(c) “The skeletal support, though giving protection, makes molluscs inefficient.” Comment on the statement.
Q. No. 4
(a) “The annelids are metamerically segmented organisms.” Discuss the statement.
(b) Discuss the water vascular system in echinoderms.
SECTION-II
Q. No. 5
(a) Discuss retrogressive metamorphosis with reference to Ascidian.
(b) “Amphioxus is an ideal chordate.” Comment.
Q. No. 6
(a) Discuss the evolutionary changes in the structure of the heart in different chordate groups.
(b) Write a brief essay on migration in birds.
Q. No. 7
(a) Give an account of the development of a chick up to the development of three germinal layers.
(b) Name the ten cranial nerves found in Scoliodon.
Paper-II
PART-2(Subjective) 80 Marks
Attempt ONLY FOUR Questions from PART-II. (20×4)
PART-II
Q. No. 2
(a) Draw nest diagrams representing important stages of meiosis in an organism having the diploid chromosomal number of 4.
(b) Define excretion and briefly discuss the main excretory products in animals.
Q. No. 3
(a) Define and explain genetic linkage. What are the cytological bases of linkage?
(b) How will you explain the production of a long neck in giraffes under Darwinian theory?
Q. No. 4
(a) Give a detailed account of the phosphorus cycle.
(b) What do you understand from energy subsidy?
(c) Define hormones. How do these differ from enzymes?
Q. No. 5
(a) Discuss the mechanism of the transport of oxygen from lungs to the tissues.
(b) Write a brief note on paracentric inversion.
Q. No. 6
(a) Give a brief account of orthogenesis.
(b) Discuss the basic structure and chemical composition of mitochondrion.
Q. No. 7
(a) Define pollution. Discuss air pollution with reference to Pakistan.
(b) Define and explain epistasis. How does it differ from genetic dominance?
Q. No. 8
Write short notes on the following:
(a) Golgi complex
(b) Global warming
(c) Possible first living organism
(d) Linkage