CSS Zoology Past Paper 2005
Paper-I
PART-2(Subjective) 80 Marks
Attempt ONLY FOUR Questions from PART-II. (20×4)
PART-II
SECTION-I
Q. No. 2
(a) Write a brief account of conjugation in Protozoa
(b) “Porifera is a group falling at just above the colonial level of organization.” Comments.
(c) “Corals are distributed over a wider range, yet coral reefs are present in selected areas.” Discuss.
Q. No. 3
(a) “Parasitism leads to development of some characters and withdrawal of some other characters.” Discuss the statement with reference to Platyhelminthes.
(b) Write a brief account of the shell in Mollusca.
(c) “Water Vascular system is the lifeline in Echinodermata.” Comment on the statement.
Q. No. 4
Write short notes on the following:
(a) Metameric segmentation
(b) Respiration in Arthropoda
(c) Enterocoelomates
(d) Pseudocoelomates
SECTION-II
Q. No. 5
(a) Discuss retrogressive metamorphosis with reference to Ascidians.
(b) “Amphioxus is an ideal chordate.” Discuss the statement.
Q. No. 6
(a) “The skeleton of Petromyzon is at a very initial stage of development.” Justify the statement.
(b) “The heart gradually evolved into a more efficient pumping organ in different chordate groups.” Explain the statement.
Q. No. 7
(a) Write an essay on migration in birds, with special reference to Pakistan.
(b) Discuss the different types of eggs found in different chordate groups.
Paper-II
PART-2(Subjective) 80 Marks
Attempt ONLY FOUR Questions from PART-II. (20×4)
PART-II
Q. No. 2
(a) Discuss the role of light and the transformation of COâ‚‚ in photosynthesis.
(b) Define respiration. What is meant by respiratory quotient?
(c) What is dormancy? Describe methods of breaking dormancy.
Q. No. 3
(a) Define ecology. Describe the applications of ecology in detail.
(b) What is plant succession? Give a detailed account of the process of plant succession starting in a lake.
Q. No. 4
(a) Give an account of methods for reclamation of waterlogged soil.
(b) Write an essay on natural resources of Pakistan.
Q. No. 5
(a) What is soil erosion? What are its causes? How can we control it?
(b) Environmental pollution is the result of urbanization and industrialization. Comment on the statement.
Q. No. 6
Write notes on the following:
(a) Plant hormones
(b) Vernalization and its significance
(c) Food web
(d) Methods of sampling vegetation
Q. No. 7
Describe the structure and functions of the following cell organelles. Draw diagrams where necessary:
(a) Mitochondria
(b) Endoplasmic reticulum
(c) Cell wall
(d) Ribosomes
(e) Golgi bodies
Q. No. 8
(a) What do you know about the theory of natural selection?
(b) What is mutation? Describe its different types.
(c) Give an account of crossing over and polyploidy.