Nalanda Open University
Annual Examination 2016
B.Sc. Botany (Honours), Part-III
Paper-VI (Environmental Biology)
Time: 3.00 Hrs. Full Marks: 80
Answer any five questions. Questions No. 1 is compulsory. All questions carry equal marks.
1. Multiple choice questions
In which category the phytoplanktons will be placed?
Producer Consumer
Decomposer None of these
Nitrifying bacteria produce
NO 3 to N2 NH3 to NO 3
Protein to NH3 None of these
Cycling of mineral elements in an ecosystem is called
Biological cycle Chemical cycle
Geological cycle Biogeochemical cycle
Acid rain is formed due to the union of water with
SO2 Dust N2 None of these
Sunken stomata are found in
Casuarina Hydrilla China rose Orchid
Poineer of plant succession on rock is
Bryophyta Pteridophyta Moss Lichen
Viviparous germination is found in
Xerophytes Hydrophytes
Halophytes Mesophytes
(viii) Rhizophora occurs in
Alpine zone Jammu and Kashmir
Central India Andaman and Nicobar
2. Give details of biogeochemical cycle. Describe the nitrogen cycle in nature.
3. Give an account of sources of air pollution and describe its control
measure.
4. What do you mean by phytogeography? Describe the major
phytogeographical regions of India in brief.
5. Describe the analytical character of community.
6. What do you mean by biological diversity?
7. Describe the morphological, anatomical and physiological characteristics
of Xerophytes.
8. Explain succession and describe succession of plant on bare rock.
9. Describe different catagories of natural resources.
10. Write notes on any Two of the following
Green house effect Primary productivity
Vivipary Forest ecosystem