Nalanda Open University
Annual Examination 2017
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
The major pollutant from automobile exhaust is:
NO CO
SO2 Soot
A high biological Oxygen demand indicates that:
Water is pure Absence of microbial
action
Low level of microbial pollution High level of
microbial
pollution.
Study of ecology of population is called
Autecology Synecology
Demecology Ecotype
Which of the ecological pyramid is always upright?
Pyramid of number Pyramid of biomass
Pyramid of energy All of these
Which of the following is having both
hydrophytic and xerophytic characters
Typha Nerium Rananculus
Ceratophyllum
Which of the following is not an air pollutant?
Fallen from plants Hydrarbones Sulphur
dioxide
Phosphates
The Red data book maintains a record of the
Plants and animals present in the whole world
Relationship between man and biosphere
Plants and animals which known to be
endangered Forest world in the whole
world.
2. Define ecosystem?Describe various componnts of ecosystem with
suitable examples.
3. What do you understand by the term ecological succession?
Describe ecological succession in a virgin pond.
4. Describe, how a hydrophytic plants adapt themselves for living in
water habitat?
5. What is ecological pyramid? Describe:
Food chain in grassland Food chain in a Pond
6. Write an essay on water pollution? Describe ill effects of water
pollution.
7. Describe different categories of natural resources.
8. What do you mean by conservation of biodiversity? Describe
methods adopted for conservation of biodiversity.
9. Explain briefly
Agro forestry and it significance
Social forestry and its significance
10. Write short notes on any four of the following
Plant indicator Significance of protected area
Green house gases Acid rain
Chipko movement Non-conventional energy.