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:
Acid rain is formed due to the union of water with:
SO2 Dust N2 None
Artificial ecosystem is:
Pond Forest Grassland Crop land
Maximum rate of productivity is of:
Tropical grassland Tropical forests Temperate forests Crop Land
Lichens and Mosses are observed in:
Hydrosere Xerosere
Hydrarch Succession Psammosere
Increase in concentration of pollutants in higher trophic level is called as:
Recycling Eutrophication Biodegradation Biomagnification
The result of ozone hole is:
Global warming Acid rain
Green house effect The UV radiations reach the earth
Which of the following is a Nitrogen fixing organism?
BGA Rhizobium Both a and b Aspergillus
(viii) Which of the following are the natures cleaner?
Producers Consumers
Symbionts Decomposers and Scavengers
2. What is succession? Mention different stages of succession in a pond.
3. What is Bio-geochemical cycle? Describe any one of them in detail.
4. Describe the analytical character of a plant community.
5. Describe different sources of air pollution. What measures can be taken to control it?
6. Describe different Phyto-geographical regions of India.
7. What do you mean by Biological diversity? What are the values of Biodiversity?
8. Describe different categories of natural resources.
9. What measures can be taken for conservation of Biological diversity?
10. Write short notes on any two of the following
Vivipary Hydrophyte adaptation
Forest ecosystem Adaptation in Xerophytes