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PPSC · PMS Punjab 2020

Zoology, Paper II

100 marks · 3 hours · 9 questions
This paper Zoology · all yearsQ. 1 · What are lysosomes? Discuss various…Q. 2 · What are the steps involved…Q. 3 · What are the adaptations for…Q. 4 · Name the hormones secreted by…Q. 6 · What is gene insertion? How…Q. 7 · What is meant by reproductive…Q. 8 · What is meant by Allelic…Q. 9 · What is acid rain? What…Q. 10 · Differentiate between following: i. Lotic…With this paper← 20202021 →
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Section A

Q. 1
  1. (a)What are lysosomes? Discuss various types of lysosomes. Give detail account of functions of lysosomes. [10]
  2. (b)Differentiate between the following i. Transcription in Prokaryotes and transcription in Eukaryotes ii. RNA and DNA [10]
(20)
Q. 2
  1. (a)What are the steps involved in the process of Glycolsis? [5]
  2. (b)How many net ATPs are formed after complete oxidation of one glucose molecule? Show in tabular form. [5]
  3. (c)Cell membrane is the outer covering of the cell and is selectively permeable. Describe the different ways through which molecules pass through the membrane. [10]
(20)

Section B

Q. 3
  1. (a)What are the adaptations for osmoregulation that are found in organisms living in fresh water and marine water? [10]
  2. (b)Differentiate between following i.Sensory nerves and Motor nerues ii.Nerves and Tracts iii.Nuclei and Ganglions iv.CNS and PNS v.Cranial and Spinal nerv [10]
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Q. 4
  1. (a)Name the hormones secreted by the adenohypophysis, their target cells and principal actions. [10]
  2. (b)Write detail note on the generation of Nerve impulse and its transmission between cells. Discuss the role of Sodium Potassium Pump in maintaining the resting membrane potential. [10]
(20)

Section C

Q. 6
  1. (a)What is gene insertion? How is gene insertion being used in treatment of SCID patients? [10]
  2. (b)Differentiate between sex linked and sex influenced traits. [5]
  3. (c)What is the genetic code and how is it important? [5]
(20)

Section D

Q. 7
  1. (a)What is meant by reproductive isolation? How does it play its role in Speciation? Discuss types of Speciation. [10]
  2. (b)Who was Lamarck? How did he explain the process of Evolution in his theory of inheritance of acquired characters? [10]
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Q. 8
  1. (a)What is meant by Allelic Frequency? How it can remain constant generation after generation? Explain your answer with the help of Hardy-Weinberg Equilibrium. [10]
  2. (b)Write an essay on Mutation including kinds of Point Mutation and causes of Mutation. [10]
(20)
Q. 9
  1. (a)What is acid rain? What kinds of pollutants contribute to its formation? [5]
  2. (b)Why chlourofluorocarbons are thought to contribute to the skin cancer? [5]
  3. (c)What are biogeochemical cycles? Discuss carbon and sulphur cycle in detail. [10]
(20)
Q. 10
  1. (a)Differentiate between following: i. Lotic and Lentic Ecosystem ii. Primary Succession and Secondary Succession iii. Pioneer Community and Climax Community iv. Grazers and Browsers v. Keystone Species and Dominant Species [10]
  2. (b)Differentiate between arctic tundra and alpine tundra. Write various adaptations in organisms for deserted mode of life. [10]
(20)

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The 2020 PMS Punjab Zoology paper set by the PPSC. Question wording only; questions marked “Not yet checked” have not been compared with the official paper yet.

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