IAS UPSC (CSE) Mains 2004: 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 (in not more than 200 words each) : (20 × 3 = 60)
- Differentiate between bacteria and cyanobacteria.
- Give an account of algae in industry.
- Discuss the sequential steps involved in host pathogen interaction.
- Mention the indirect uses of Bryophytes.
- Write about the following: (20 × 3 = 60)
- Differentiate between homospory and heterospory.
- Give an account of Rhynia.
- Describe in detail the types of Ascocarps (Fruit bodies) in Ascomycotina and how they help
- in classification.
- Write critical notes on the following: (20 × 3 = 60)
- Sporocarp of Marsilea.
- Tissue culture and its importance
- Evolution of Sporophyte in Bryophytes
- Write short notes on the following: (30 × 2 = 60)
- Mention the causal organism, symptoms and control measures of bacterial blight in paddy, sandal spike and leaf spot in groundnut.
- Give the role of bacteria in fermentation and mention the products.
Section-B
- Answer any three of the following (in not more than 200 words each) : (20 × 3 = 60)
- Give the salient features of Cordaitales.
- Explain the secondary growth in Pinus stem.
- Explain the Tunica Corpus theory.
- Give an account of plant gums.
- Write about the following: (30 × 2 = 60)
- Give an account of pollen grain morphology and application of palynology.
- Discuss the role of chemotaxonomy and numerical taxonomy in systematics of Angiosperms.
- Write critical notes on the following: (20 × 3 = 60)
- Floral structure and primitive characters of Magnoliaceae.
- Floral structure and floral formula of Poaceae.
- Differentiate between the pollinia of Asclepiadaceae and Orchidaceae.
- Write short notes on the following: (20 × 3 = 60)
- Give an account of beverage yielding plants.
- Differentiate between xylem and phloem.
- Give the salient features of Bentham and Hooker՚s system of classification.
Paper-II
Section-A
- Write notes on any three of the following in about 200 words each: (20 × 3 = 60)
- Meiosis
- Sex-linked inheritance
- Mass selection
- Chi-squre test
- Describe in detail the structure and functions of mitochondria (60) .
- Discuss the synthesis of nucleic acids and proteins (60) .
- Answer the following questions
- Describe the back-cross method of breeding in crop varieties (30) .
- Describe in detail the various uses of back-cross method of breeding and its limitations (30) .
Section-B
- Write notes on any three of the following in about 200 words each: (20 × 3 = 60)
- Photoperiodism
- Seed dormancy
- Social forestry
- Pollution control
- Describe the principle categories of enzymes involved in respiratory reactions (60) .
- Answer the following questions
- What do you understand by mineral nutrition of crop plants (20) ?
- Describe the role of nitrogen, phosphorus and potash on plant growth (40) .
- Answer the following questions
- What do you understand by conservation of biodiversity (20) ?
- How is biodiversity conserved (40) ?