CSS Zoology Past Paper 2006
Paper-I
PART-2(Subjective) 80 Marks
Attempt ONLY FOUR Questions from PART-II by selecting TWO questions from EACH
SECTION. (20×4)
PART-II
SECTION-I
Q. No. 2.
(a) Discuss PROTOZOA as UNICELLULAR and ACELLULAR organisms
(b) Define POLYMORPHISM and discuss it with reference to COELENTERATES
(c) “ANNELIDS are said to have true METAMERIC SEGMENTATION”
Q. No. 3.
(a) “PORIFERA exhibits a tissue level of organization.” Discuss.
(b) “ECHINODERMS have a close evolutionary relationship with CHORDATES.” Comment on the statement
(c) Discuss insects as the most successful group
Q. No. 4. Write short notes on the following:
(a) CORAL REEF
(b) COELOME
(c) TUBE FEET IN ECHINODERMS
(d) FOOT IN MOLLUSCA
SECTION-II
Q. No. 5.
(a) “HEMICHORDATES have a mixture of CHORDATE and NON-CHORDATE characters.” Explain
(b) “ALL the CHORDATE characters are present in Ascidea in the larval stage.” Discuss
Q. No. 6.
(a) Write an essay on the biting mechanism of snakes
(b) Discuss the different adaptations to flight with reference to birds
Q. No. 7.
(a) Describe placentation in mammals
(b) Write a short essay on the different types of scales found in fishes
Paper-II
PART-2(Subjective) 80 Marks
Attempt ONLY FOUR Questions from PART-II. (20×4)
PART-II
Q. No. 2.
(a) Give a detailed account of the structure of lysosome. Discuss its function in a cell
(b) Discuss the steps involved in the semi-conservative replication of DNA
Q. No. 3.
(a) Describe the microscopic, ultramicroscopic, and chemical structure of a Eukaryotic chromosome
(b) List the steps involved during the process of meiosis
Q. No. 4.
(a) Define respiration. Discuss the mechanism involved in the transport of carbon dioxide from tissue to lungs
(b) What is the basic excretory product? Discuss different excretory substances produced in different animals
Q. No. 5.
(a) Describe the mechanism involved in transmission of the nerve impulse along the nervous system
(b) “Pituitary Gland works as a link between the nervous system and the other hormonal complexes of the body”. Discuss
Q. No. 6.
(a) Discuss the phenomena of genetic linkage
(b) Describe sex linkage, giving a suitable example
(c) Discuss Mendel’s law of segregation, as it is understood now
Q. No. 7.
(a) Discuss polyploidy. How is it exploited for human development?
(b) Define gene map. Discuss the method involved in the preparation of a gene map in diploid
Q. No. 8.
(a) Give an account of Darwin’s theory of natural selection, as it is understood now
(b) State and explain Haeckel’s Biogenetic law