CSS Botany Past Paper 2020

Instructions specific to this paper

• Attempt ONLY FOUR questions from PART-II. ALL questions carry EQUAL marks.

Questions

1. Q. 220 marks

   Discuss the life cycle of late blight of potato. Discuss its epidemics, disease forecast and control.

2. Q. 320 marks

   Write a note on sporophyte of Pinus. Compare reproductive characteristics of Pinus with Selaginella.

3. Q. 420 marks

   Write down the discovery, chemical structure, and role of gibberellins in regulating various physiological processes in plants.

4. Q. 520 marks

   Describe nitrogen cycles between the abiotic environment and organisms. Briefly describe how human activities have changed global nitrogen budget.

5. Q. 620 marks

   How Morgan and his students demonstrated that gene was linked in fruit flies? How linkage is related to some events in meiosis?

6. Q. 720 marks

   Differentiate between plasmid and vector. Briefly explain bacteriophage lambda (λ) vector. Describe its working and selection process.

7. Q. 820 marks

   Write down a comprehensive notes on any TWO of the followings: (10 each) (a) The four components of taxonomy. (b) Distribution of gymnosperms in Pakistan. (c) Differences in vascular system of stem of monocot and dicot plants.

Standard FPSC instructions

Printed on this and every CSS paper.

• Part-II is to be attempted on the separate Answer Book.
• All the parts (if any) of each question must be attempted at one place instead of at different places.
• Write Q. No. in the Answer Book in accordance with Q. No. in the question paper.
• No page/space be left blank between the answers. All the blank pages of the Answer Book must be crossed.
• Extra attempt of any question or any part of the attempted question will not be considered.