UPSC Botany Optional Question Paper 2019: CS Mains Paper-I
Baljit Dhaka

UPSC Botany Optional Question Paper 2019: CS Mains Paper-I

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upsc botany optional question paper 2019

Civil Services IAS Mains Exam: Botany Optional Paper-1 (2019)

In this topic, we will talk about UPSC civil services mains optional paper-i previous year 2019 question paper.

Marks-250                                                                                                                   Time: Three Hours

Question Paper Specific Instructions:

Please read each of the following instructions carefully before attempting questions.

  • There are EIGHT questions divided into two sections.
  • A candidate has to attempt FIVE questions in all.
  • Questions no 1 and 5 are compulsory and out of the remaining, THREE are to be attempted choosing at least ONE from each section.
  • The number of marks carried by a question /part is indicated against it.
  • Word limit in questions, wherever specified should be adhered to.
  • Attempts of questions shall be counted in chronological order. Unless struck off, an attempt of a question shall be counted even if attempted partly. Any page or portion of the page left blank in the answer book must be clearly struck off.


1. Describe the following in about 150 words each :
1. (a) Mycorrhizal association and its importance in plants.  10 marks
1. (b)Differentiation between bioremediation and bioleaching. 10 marks
1. (c) Nature and significance of plant-endophyte relationship. 10 marks
1. (d) Alternation of heteromorphic generations in Bryophytes. 10 marks
1. (e) Draw a well-labeled longitudinal sectional view of the structure of capsule of Funaria. 10 marks

2. (a) What are the characteristic features, means of reproduction and economic importance of Ascomycetes ?      20 marks

2. (b) Describe the characteristics and replication of viroids. 15 marks

2. (c) What are the critical features of heterospory and seed habit in pteridophytes. 15 marks

3. (a) Write the name of causal agent, symptoms and control measures of a yellow vein of Okra and Tundu disease of wheat. 20 marks

3. (b) Comment on the structure and ecological and physiological importance of leaf of Azolla. 15 marks

3. (c) Compare the thallus forms of brown and green algae. 15 marks

4. (a) Compare and contrast the systems of classifications of Bentham and Hooker, and Hutchinson. Add a note on their merits and demerits. 20 marks

4. (b) What causes anomalous secondary growth in some dicot plants ? Explain. 15 marks

4. (c) State the applications of Microbiology in Agriculture. 15 marks



5. Describe the following in about 150 words each:
5. (a) Importance of haploid plant production from pollen grains. 10 marks
5. (b) Hydrocarbon yielding energy crops and advantages of biodiesel.  10 marks
5. (c) Steps in the production of somatic hybrids and their advantages.  10 marks
5. (d) Illustrate Kranz anatomy in a typical C4 plant leaf.  10 marks
5. (e) Palynology and its significance.  10 marks

6. (a) Define herbarium and give methods of its preparation and also mention the names of five major herbaria. 20 marks

6. (b) Write botanical names and families of the plants yielding beverages, narcotics and gums. 15 marks

6. (c) What are the identifying characters, floral diagram and floral formula of Verbenaceae and Liliaceae ? 15marks

7. (a) Highlight the main features of Vavilov's centers of origin of crop plants.  20 marks

7. (b) Define totipotency and discuss cytodifferentiation in plants.  15 marks

7. (c) How is Embryology useful in Taxonomy ?  15 marks

8. (a) How many types of embryo-sacs are known among angiosperms ? Describe their formation. Give one example for each.  20 Marks

8. (b) Discuss the salient features of Gnetales. Why are they regarded as the most evolved Gymnosperms ? 15 marks

8. (c) What are the different stages of micropropagation ? Mention its advantages. 15 marks