EVS/V/CC/11 Student's Copy
2 0 1 8
CBCS
5th Semester
ENVIRONMENTAL SCIENCE
SIXTH PAPER (EVS-503)
Environmental Biology
Full Marks 75
Time 3 hours
PART A—OBJECTIVE
Marks 25
The figures in the margin indicate full marks for the questions
SECTION—A
Marks 10
Tick the correct answer in the brackets provided 1×10=10
1. An intimate association of two organisms of different species, for mutual
benefit, involving an organic union between the two and the individuals
may not be able to live separately, is called
commensalism
symbiosis
amensalism
parasitism
/159 1 Contd.
2. Mycorrhiza represents
symbiotic association between a fungus and a liverwort
parasitic association between a fungus and an alga
parasitic association between a fungus and roots of plants
symbiotic association between a fungus and roots of higher
plants
3. A population is a group of
all the individuals of any kind
all the individuals of the same kind in and area at a given
time
species in a community
communities in an ecosystem
4. Exponential growth occurs when there is
a great environmental resistance
no environmental resistance
no biotic potential
a fixed carrying capacity
5. Which of the following statements is true?
A community and its habitat mutually interact
A community and its habitat mutually interdependent
Both and
None of the above
6. Community ecology or the study of the interactions between species in
communities on many spatial and temporal scales, including the
distribution, structure, abundance, demography and interactions between
coexisting populations, is called
autecology
monoecology
synecology
applied ecology
EVS/V/CC/11/159 2 Contd.
7. Invasive species leads to all of the following problems, except
increased biodiversity
loss of biodiversity
diseases
loss of native species
8. Red Data Book contains information about
all plant species
all animal species
threatened species
economically important species
9. IUCN Headquarters is located at
Paris, France
New York, USA
Vienna, Austria
Gland, Switzerland
10. All are in situ conservation efforts, except
national parks
wildlife sanctuaries
zoo
biosphere reserves
SECTION—B
Marks 15
Write short notes on the following 3×5=15
UNIT—I
1. Evolution of organisms
OR
2. Environmental factors
EVS/V/CC/11/159 3 Contd.
UNIT—II
3. Biotic potential
OR
4. Age distribution of population
UNIT—III
5. Autecology
OR
6. Community metabolism
UNIT—IV
7. Keystone species
OR
8. Prevention and mitigation of alien species
UNIT—V
9. Biosphere reserves
OR
10. Wildlife sanctuaries
PART B—DESCRIPTIVE
Marks 50
The figures in the margin indicate full marks for the questions
1. What is environmental biology? Describe the fundamental principles and
scope of environmental biology.
OR
What are the ecological factors that influence the plants and animals?
Explain the positive and negative interactions between two different
populations with the help of suitable examples. 5+5=10
EVS/V/CC/11/159 4 Contd.
2. Define population. Describe, in detail, the different characteristics of
population with suitable examples. 2+8=10
OR
Give detailed accounts on the following 5+5=10
Growth form of population
Population factors
3. What is community ecology? Discuss the different characteristics of
community structure with suitable examples. 2+8=10
OR
Describe, in detail, the different methods used for study of communities. 10
4. What are invasive alien species? Discuss the characteristics and impact of
invasive species in the environment. 2+8=10
OR
Give detailed accounts on the following 5+5=10
Causes and types of extinction of species
Objectives and origin of conservation biology
5. What do you understand by IUCN? Discuss the different methods for
conservation at population and species levels. 2+8=10
OR
What do you mean by protected areas? Explain the role of protected areas in
conservation by giving suitable examples. 2+8=10