CSS past paper

CSS Botany Past Paper 2020

CSS Botany 2020 carries 100 marks over 3 hours. It has 7 questions.

Years

How to attempt: Attempt ONLY FOUR questions from PART-II. ALL questions carry EQUAL marks.

Question 1 (Part I) is the paper's MCQs, which are not reproduced here.

Q. 2
Discuss the life cycle of late blight of potato. Discuss its epidemics, disease forecast and control.
(20)
Q. 3
Write a note on sporophyte of Pinus. Compare reproductive characteristics of Pinus with Selaginella.
(20)
Q. 4
Write down the discovery, chemical structure, and role of gibberellins in regulating various physiological processes in plants.
(20)
Q. 5
Describe nitrogen cycles between the abiotic environment and organisms. Briefly describe how human activities have changed global nitrogen budget.
(20)
Q. 6
How Morgan and his students demonstrated that gene was linked in fruit flies? How linkage is related to some events in meiosis?
(20)
Q. 7
Differentiate between plasmid and vector. Briefly explain bacteriophage lambda ( λ vector. Describe its working and selection process.
(20)
Q. 8
Write down a comprehensive notes on any TWO of the followings: (10 each)
(20)
- (a)
  The four components of taxonomy.
  (10)
- (b)
  Distribution of gymnosperms in Pakistan.
  (10)
- (c)
  Differences in vascular system of stem of monocot and dicot plants.
  (10)

Part-II is to be attempted on the separate Answer Book.
Attempt ONLY FOUR questions from PART-II. ALL questions carry EQUAL marks.
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 Q.Paper.
No Page/Space be left blank between the answers. All the blank pages of Answer Book must be crossed.
Extra attempt of any question or any part of the question will not be considered.