Nalanda Open University
Annual Examination 2016
B.Sc. Botany (Subsidiary), Part-II
Paper-II
Time: 3.00 Hrs. Full Marks: 80
Answer any Five questions. All questions carry equal marks.
1. How does the anomalous secondary growth differ from normal secondary
growth? Describe the anomalous secondary growth in Boerhaavia.
2. Give an account of pollen grain formation.
3. Describe prophase of Meiosis I.
4. Describe the structure of DNA.
5. Define crossing over and discuss various views to explain the mechanism
of recombination.
6. Describe the C3 pathway of CO2 fixation.
7. What do you mean by Nitrogen fixation? Describe biological Nitrogen
fixation.
8. What is environmental pollution? Describe the sources of air pollution and
suggest the methods of its control.
9. Name some common oil yielding crops of Bihar state and write the methods
of their cultivation in brief.
10. Write notes on any four of the following:
Nucleolus. Cell cycle.
Beverage. Stages of hydrosere.
Role of decomposers in ecosystem. β chromosome.