COMBINED COMPETITIVE EXAMINATION
FOR RECRUITMENT TO THE POSTS OF
PROVINCIAL MANAGEMENT SERVICE, ETC -2023
SUBJECT: ZOOLOGY (PAPER-II)
TIME ALLOWED: THREE HOURS MAXIMUM MARKS: 100
NOTE:
i. All the parts (if any) of each Question must be attempted at one place instead of at different places.
ii. Write Q. No. in the Answer Book in accordance with Q. No. in the Q. Paper.
iii. No Page/Space be left blank between the answers. All the blank pages of Answer Book must be crossed.
iv. Extra attempt of any question or any part of the question will not be considered.
NOTE: Attempt FIVE Questions in All Selecting ONE from each Section. Attempt in Urdu or English.
SECTION-A
Q. No. 1. a) Describe various models of plasma membrane. Explain the more dynamic model with justification.
b) Elaborate the extra nuclear organelles in eukaryotic cell with their functions.
(10+10=20 Marks)
Q. No. 2. a) Elaborate different nuclear and extra nuclear cell organelles along with their functions. Draw the labelled diagrams also.
b) Differentiate between reversible and irreversible enzymatic inhibition.
(10+10=20 Marks)
SECTION-B
Q. No. 3. a) How the osmoregulation contributes in homeostasis? Describe process of osmoregulation in vertebrates.
b) Write in detail the mechanisms of active membrane potential and resting membrane potential. Support the answer with suitable diagrams. (10+10=20 Marks)
Q. No. 4. a) Describe the mechanism of respiration in animals, write the role of different organs of respiratory system in detail.
b) What are different organs involved in circulatory system? Write the cardiovascular mechanism comprehensively. (10+10=20 Marks)
SECTION-C
Q. No. 5. a) Differentiate between two principles of Mendel namely the law of segregation and law of independent assortment.
b) How can pedigree analysis be used to predict genotypes of the future offspring?
(10+10=20 Marks)
Q. No. 6. a) Discuss a case of mammalian embryo who has a blood type antigenically different from its mother.
b) What is epistasis? Explain a pattern of epistatic gene interaction in humans.
(10+10=20 Marks)
SECTION-D
Q. No. 7. a) How can genetic drift contribute to evolution? What are the causes of genetic drift?
b) Why is the natural selection considered a primary mechanism of adaptive evolution?
(10+10=20 Marks)
Q. No. 8. a) Which mechanisms provide raw materials for the process of natural selection to act upon?
b) What is adaptive radiation? Explain a case example of adaptive radiation.
(10+10=20 Marks)
SECTION-E
Q. No. 9. a) How agroecosystems differ from natural ecosystems? What are the different types of agroecosystems?
b) Describe a general model of nutrient cycling showing the primary reservoirs of nutrients.
(10+10=20 Marks)
Q. No. 10. a) Differentiate between gaseous nutrient cycles and sedimentary cycles.
b) Briefly describe the major steps in nitrogen cycle.
(10+10=20 Marks)
FOR RECRUITMENT TO THE POSTS OF
PROVINCIAL MANAGEMENT SERVICE, ETC -2023
SUBJECT: ZOOLOGY (PAPER-II)
TIME ALLOWED: THREE HOURS MAXIMUM MARKS: 100
NOTE:
i. All the parts (if any) of each Question must be attempted at one place instead of at different places.
ii. Write Q. No. in the Answer Book in accordance with Q. No. in the Q. Paper.
iii. No Page/Space be left blank between the answers. All the blank pages of Answer Book must be crossed.
iv. Extra attempt of any question or any part of the question will not be considered.
NOTE: Attempt FIVE Questions in All Selecting ONE from each Section. Attempt in Urdu or English.
SECTION-A
Q. No. 1. a) Describe various models of plasma membrane. Explain the more dynamic model with justification.
b) Elaborate the extra nuclear organelles in eukaryotic cell with their functions.
(10+10=20 Marks)
Q. No. 2. a) Elaborate different nuclear and extra nuclear cell organelles along with their functions. Draw the labelled diagrams also.
b) Differentiate between reversible and irreversible enzymatic inhibition.
(10+10=20 Marks)
SECTION-B
Q. No. 3. a) How the osmoregulation contributes in homeostasis? Describe process of osmoregulation in vertebrates.
b) Write in detail the mechanisms of active membrane potential and resting membrane potential. Support the answer with suitable diagrams. (10+10=20 Marks)
Q. No. 4. a) Describe the mechanism of respiration in animals, write the role of different organs of respiratory system in detail.
b) What are different organs involved in circulatory system? Write the cardiovascular mechanism comprehensively. (10+10=20 Marks)
SECTION-C
Q. No. 5. a) Differentiate between two principles of Mendel namely the law of segregation and law of independent assortment.
b) How can pedigree analysis be used to predict genotypes of the future offspring?
(10+10=20 Marks)
Q. No. 6. a) Discuss a case of mammalian embryo who has a blood type antigenically different from its mother.
b) What is epistasis? Explain a pattern of epistatic gene interaction in humans.
(10+10=20 Marks)
SECTION-D
Q. No. 7. a) How can genetic drift contribute to evolution? What are the causes of genetic drift?
b) Why is the natural selection considered a primary mechanism of adaptive evolution?
(10+10=20 Marks)
Q. No. 8. a) Which mechanisms provide raw materials for the process of natural selection to act upon?
b) What is adaptive radiation? Explain a case example of adaptive radiation.
(10+10=20 Marks)
SECTION-E
Q. No. 9. a) How agroecosystems differ from natural ecosystems? What are the different types of agroecosystems?
b) Describe a general model of nutrient cycling showing the primary reservoirs of nutrients.
(10+10=20 Marks)
Q. No. 10. a) Differentiate between gaseous nutrient cycles and sedimentary cycles.
b) Briefly describe the major steps in nitrogen cycle.
(10+10=20 Marks)
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