IAS UPSC (CSE) Mains 2006: Botany
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Paper-I
Section A
- Answer any three of the following in not more than 200 words each: (20 × 3 = 60)
- What is bioremediation?
- Briefly discuss the phyletic position of photobionts.
- Highligh the uniqueness of the cell structure of Anthoceros.
- What is polarity and how does it affect differentiation?
- How do the following differ from each other: (20 × 3 = 60)
- Hybrid from Cybrid
- Cryptogams from Archegoniates
- Sporophyte from Gametophyte (in lower organisms)
- Describe the following: (20 × 3 = 60)
- Molecular basis of infection
- Practical application of ovule culture
- Microbes as indicators of pollution
- Draw neat and well-labelled diagrams to show: (20 × 3 = 60)
- Lytic cycle
- Diagnostic stages of any two powdery mildews
- L S sporocarp of Marsilea
Section B
- Answer any three of the following in not more than 200 words each: (20 × 3 = 60)
- What are the symptoms and causes of hay fever?
- Describe the morphological nature of commercial cotton, clove and saffron.
- Describe the phyletic position of Magnoliaceae.
- Citing suitable examples explain what is meant by ‘form genus’
- With the help of suitable diagrams explain: (30 × 2 = 60)
- Development of a bisporic embryo sac
- Vavilovian centres of origin of crop plants
- Discuss the following: (60)
- Alpha and Omega taxonomy
- Ethnobotany and its importance
- Nemec phenomenon
- Describe the following: (20 × 3 = 60)
- Distribution in India of the genus yielding “Taxol”
- Phenomenon of apomixis and its importance
- Commonalities and differences between Cyeadofilicales and Cyeads
Paper-II
Section A
- Write short notes on any three of the following in about 200 words each: (3 × 20 = 60)
- Structure of plasma membrane
- Polytene chromosomes
- DNA damage and repair
- Molecular markers in plant breeding
- Answer the following questions
- Explain linkage and crossing-over. Describe the methods of construction of gene maps (30) .
- What are mutations? Describe different types of mutations and add a note on chemical mutagens (30) .
- Explain the following with suitable examples:
- Techniques of breeding self-pollinated crops (20) .
- Protoplast culture and its importance (20) .
- Uses and applications of correlation and regression analysis in plant genetics (20) .
- Answer the following questions
- Explain the mechanism of DNA replication (20) .
- Discuss cytoplasmic inheritance: (20)
- Describe in brief the regulation of gene expression in eukaryotes (20) .
Section B
- Answer any three of the following. Each part should be answered in not more than 200 words: (20 × 3 = 60)
- Discuss the role of any three trace elements in plant nutrition. Give their deficiency symptoms.
- Explain the mechanisms of respiratory functions in plants.
- Discuss the strategies for conservation of endemic and endangered plants.
- Describe the causes and consequences of greenhouse effect
- Answer the following questions
- Describe the photosynthetic carbon assimilation in C3 and C4 plants (20) .
- Explain the factors that affect photosynthesis. Define photosynthetic efficiency of crops (20) .
- Answer the following questions
- Write an account of the physiological changes that occur during high temperature stress. How plants have adopted physiologically for tolerance of high temperature stress (30) ?
- Describe the effects of metal stress on plant growth and development (30) .
- Answer the following questions
- Define succession. Explain different stages of succession with illustrations (30) .
- Enumerate the structure and functions of an ecosystem (30) .