IAS UPSC (CSE) Mains 2003: Botany
IAS Prelims & Mains GS and Optional Lectures, Model Answers, and Notes at doorsteptutor.com.
Paper-I
Section-A
- Answer any THREE of the following: (not more than 200 words each) : 20 × 3 = 60
- Describe the lysogenic life cycle in viruses.
- Classify algae according to V. J. Chapman. Give characters of each class.
- Discuss evolution of steles in Pteridophytes.
- Describe various types of Path toxins and their role in plant diseases.
- With the help of suitable describe the life cycle of Aspergilius and discuss the economic importance of this genus. 60
- Give causal organism, symptoms and control measures of the following: 20 × 3 = 60
- Ergot of Bajra
- Blast of Rice
- Stem gall of coriander
- Write notes on: 20 × 3 = 60
- Reproductive structure of Chara
- Vegetative reproduction in Bryophytes
- Tot potency
Section-B
- Answer any three of the following: (not more than 200 words each) : 20 × 3 = 60
- Importance of Cycadofilicales.
- Development of female gametophyte in Angiosperms.
- Anomalous secondary growth in Dracaena.
- Energy plantation and its importance.
- Write an account of floral structures of the following families. Give botanical names of three important plant species belonging to each of the three families and specify their uses: 20 × 3 = 60
- Asteraceae
- Solanaceae
- Asclepiadaceae
- Describe the development of male gametophyte in Gnetum. Discuss the impotence of this genus. 60
- Answer the following questions
- Discuss the importance of Ethno botany in India. 30
- Give botanical names of ten spice yielding plants and write the name of their families. 30
Paper-II
Section-A
- Answer any THREE of the following in about 200 words each 20 × 3 = 60
- Evolution.
- Gametophytic apomix.
- Pure Line Selection.
- Structure and Significance of Lamp brush Chromosomes.
- Answer the following questions
- Describe in detail the physical properties of cell membrane. 30
- How does the water and solutes move through the cell membrane? 30
- Answer the following questions
- What is Cytoplasmic inheritance? 10
- Describe the Cytoplasmic-genetic male sterility. 20
- Describe in detail the method of producing hybrid seeds using Cytoplasmic-genetic male sterility system. 30
- Answer the following questions
- What do you understand by genetic engineering? 15
- Describe in detail the agro bacterium-mediated gene transfer method for producing transgenic plants. 45
Section-B
- Write short notes on any THREE of the following in about 200 words each: 20 × 3 = 60
- CO2 fixation in C4 plants
- Seed germination
- Global warming
- Conservation of biodiversity
- Answer the following questions
- What do you understand by verbalization? Discuss the factors that influence verbalization. 40
- Describe the practical significance of verbalization. 20
- Answer the following questions
- What do you understand by a biotic stresses? 20
- Describe in detail the mechanism of salt stress on plants. 30
- Describe the effect of salt stress on plant growth. 10
- Answer the following questions
- What do you understand by eco-system? 10
- How would you maintain an eco-system? 50