CSS Botany Past Paper 2021

Instructions specific to this paper

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

Questions

1. Q. 220 marks

   Cynophyta (Blue green algae) is a main group of algae. What is the economic importance of this particular group in food and hunger? Illustrate your answer with examples?

2. Q. 320 marks

   What are the physiological roles of Cytokinins and Abscisic Acid in plant growth?

3. Q. 420 marks

   What is the specificity of enzyme action? Explain it with reference to the important enzyme “Ribulose-1, 5-Bisphosphate Carboxylase-Oxygenase” (RuBisCO).

4. Q. 520 marks

   Differentiate between Vascular cambium and Cork cambium. Describe their role in secondary growth.

5. Q. 620 marks

   Write a note on cell senescence and cell death.

6. Q. 720 marks

   How are Gametophyte and Sporophyte evolved in Bryophytes?

7. Q. 820 marks

   Write a note on any TWO of the followings: (10 each) (a) Hardy – Weinberg’s Law (b) Evidences of Evolution (c) Theory of Natural Selection

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.