C. S. E-Mains 2006: Botany
Paper-II
Section A

Write short notes on any three of the following in about 200 words each: × 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

What are mutations? Describe different types of mutations and add a note on chemical mutagens .

Explain the above with suitable examples:

Techniques of breeding self-pollinated crops .

Protoplast culture and its importance .

Uses and applications of correlation and regression analysis in plant genetics .

Answer the following questions

Explain the mechanism of DNA replication .

Discuss cytoplasmic inheritance:

Describe in brief the regulation of gene expression in eukaryotes .

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 .

Explain the factors that affect photosynthesis. Define photosynthetic efficiency of crops .

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

Describe the effects of metal stress on plant growth and development .

Answer the following questions

Define succession. Explain different stages of succession with illustrations .

Enumerate the structure and functions of an ecosystem .