Zoology CSS Paper II 2004

FEDERAL PUBLIC SERVICE COMMISSION
COMPETITIVE EXAMINATION FOR RECRUITMENT TO POSTS
IN BPS – 17 UNDER THE FEDERAL GOVERNMENT, 2004.

ZOOLOGY, PAPER – II

TIME ALLOWED: THREE HOURS MAXIMUM MARKS:100

NOTE: Attempt FIVE questions in all, including question No. 8 which is COMPULSORY. All questions carry EQUAL marks.

1. (a) Give a diagrammatic representation of the structure of the mitochondrion and its molecular skeleton to show its association with Electron Transport and Oxidative Phosphorylation. (12)
   (b) Define “Respiration”, and “External” and “Internal” Respiration. How the air conducting passage ways and the Respiratory membranes function to achieve these goals. (8)

2. (a) How ‘Genetic Maps’ of chromosomes are constructed in Drosophila. What techniques should be used in man for this purpose? (12)
   (b) Could ‘Natural Selection’ alone produce ‘Speciation’ in natural populations?

3. (a) Differentiate between physical and chemical regulation of body temperature. (8)
   (b) Explain the meaning of ‘Conduction’, ‘Convection’ and ‘Radiation’ in relation to the loss of heat from the body. (12)

4. (a) Is there any truth in ‘Neo Lamarckism’? How ‘Baldwin Effect’ fits in this concept? (12)
   (b) Briefly describe Polyploidy as a method of origin of species. (8)

5. (a) Differentiate between Immunity against a disease and Resistance against a pesticide in natural populations. (12)
   (b) Define “Industrial Melanism”. Explain why in a polluted area near Birmingham, U.K., most of the specimens of peppered moth are melanic but in countryside theses are typical light coloured. (8)

6. (a) Define “Pesticide Pollution”. In how many ways does it effect the human health? (8)
   (b) Show as to how complementary interactions of two independent pairs of Alleles in seed colour in corn or coat colour in Rodents modify the Mendelian Ratio of independent assortment. Do these modified ratios in fact disprove “Mendelian Second Law of Independent Assortment”? (12)

7. Write short notes on the following: (5+5+5+5)
   (a) Genetic drift (b) Aggressive Mimicry (c) Acid rain (d) Chemogeny

COMPULSORY QUESTION
8. Write only the correct answer in the Answer Book. Do not reproduce the questions.

(1) “Chiasma” formation could be seen first time in the following stage/sub stage of Meiosis:
(a) Leptotene (b) Zygotene (c) Pachytene (d) Diplotene (e) None of these

(2) In protein synthesis each triplet code binds itself with one:
(a) Leptotene (b) Zygotene (c) Pachytene (d) Diplotene (e) None of these

(3) For the rapid production of antibody in the precipitance test involving a rabbit one of the following animals could be used.
(a) Frog (b) Lizard (c) Fowl (d) None of these

(4) In Drosophila very rarely father transmit his sex-linked trait to his normal son (in a cross of white eyed female with red eyed male):
(a) In the case of primary non-disjunction (b) In the case of secondary nondisjunction (c) In the case of a normal cross (d) None of these

(5) 13:3 Ration in “F2” is obtained in the case of:
(a) Complementary genes for colours in corn (b) Coat colours in rodents (c) In epistatic genes (d) None of these

(6) Crossing over rarely or never takes place in the male of:
(a) Mice (b) Poultry (c) Man (d) Drosophila (e) None of these

(7) XXY individual in Drosophila is phenotypically:
(a) Male (b) Female (c) Inter sex (d) None of these

(8) Fossils of which of these first living organisms were found?
(a) Protozoan (b) Algae (c) Virus (d) None of these

(9) Which of these are exclusively functional proteins?
(a) Hormones (b) Enzyme (c) Plasma (d) None of these

(10) Phytogeny represents the history of an organism:
(a) Evolutionary (b) Embryonic (c) Both ‘a’ and ‘b’ (d) None of these

(11) Sickle Cell trait is found in:
(a) Homozygous (b) Heterozygous (c) Both ‘a’ and ‘b’ (d) None of these

(12) The first living and respiring organism on earth were:
(a) Aerobes (b) Anaerobes (c) Both ‘a’ and ‘b’ (d) None of these

(13) The major portion of digestion takes place in the:
(a) Stomach (b) In the small intestine (c) In the large intestine (d) None of these

(14) Practically all absorption of digested food occurs in:
(a) Large intestine (b) Small intestine (c) Both ‘a’ and ‘b’ (d) None of these

(15) Sibling species are produced as a result of:
(a) Allopatric speciation (b) Sympatric speciation (c) Both ‘a’ and ‘b’ (d) None of these

(16) In the days just after its formation the earth had:
(a) Reducing atmosphere (b) Oxidative atmosphere (c) Both ‘a’ and ‘b’ (d) None of these

(17) Zygotes containing “XY” are females in:
(a) Drosophila (b) In moths (c) In grasshoppers (d) None of these

(18) The “Y” Chromosomes is sexually neutral in:
(a) Man (b) In Drosophila (c) In moth (d) None of these

(19) Marsupial are found in:
(a) Only Australian region (b) In near arctic and Neotropical regions (c) Both ‘a’ and ‘b’ (d) None of these

(20) In which stage of Meiosis Centromere of each dyad divides?
(a) Metaphase I (b) Metaphase II (c) Anaphase I (d) Anaphase II (e) None of these