EVSC/VI/09 Student's Copy
2 0 1 8
6th Semester
ENVIRONMENTAL SCIENCE
NINTH PAPER (EVS-601)
Environmental Toxicology and Health
Full Marks 75
Time 3 hours
PART A—OBJECTIVE
Marks 25
The figures in the margin indicate full marks for the questions
Answer all questions
SECTION—A
Marks 10
Tick the correct answer in the brackets provided 1×10=10
1. A severe effect experienced by organisms during short-term (24-96 hours)
exposure toxicants is
acute toxicity
chronic toxicity
LD50
LC50
2. The stomach having a pH represents the most significant site of
absorption for xenobiotics that are acidic or near neutral.
1 to 2
1 to 3
1 to 4
1 to 5
/529 1 Contd.
3. The effects of radioactive substances depend upon
rate of diffusion
energy releasing capacity
rate of deposition of the contaminant
All of the above
4. Which of the following form the major group of fungicides?
Benzo-imidazoles
Dithiocarbamates
Hexachlorobenzenes
Dichlorophenylethanes
5. The bacteria that has a reservoir in cattle and other similar animals is
Campylobacter
E. coli O157:H7
Salmonella
All of the above
6. In epidemiology, determinants imply
patterns of health problems in a community
measurements and summarize information
causative factors
All of the above
7. The importance of public awareness of sanitation is of sanitation
improvements.
to increase efficiency and sustainability
to increase the development and improvement
Both and
None of the above
8. Health is a set of practices performed for
sustainable sanitation
preservation of health
administration of diseases
socio-economic development
EVSC/VI/09/529 2 Contd.
9. When was the World Health Day established?
22nd July, 1946
24th July, 1948
7th April, 1948
22nd April, 1946
10. Reduction to zero of the worldwide incidence of infection caused by a
specific agent is
elimination
extinction
control
eradication
SECTION—B
Marks 15
Write short notes on the following 3×5=15
1. LD50
2. Herbicides
3. Lockjaw disease
4. Differences between sanitation and hygiene
5. Economic consideration of eradication programs
PART B—DESCRIPTIVE
Marks 50
The figures in the margin indicate full marks for the questions
1. What is exposure assessment? Explain the different types of exposure
assessment with suitable examples. 3+7=10
OR
Give an account of any two of the following 5×2=10
Biomagnification
Routes of exposure
Chronic toxicity
EVSC/VI/09/529 3 Contd.
2. What is integrated pest management? Discuss the different methods used
in integrated pest management. 2+8=10
OR
Give an account of any two of the following 5×2=10
Sources of radiation
Health effects of cadmium
Biological effects of radiation
3. Discuss in detail the different measures and control of infectious diseases. 10
OR
Write short notes on any two of the following 5×2=10
Epidemiology
Waterborne diseases
AIDS and its control
4. Define environmental health. Discuss the historical perspective of
environmental health. 2+8=10
OR
Write short notes on any two of the following 5×2=10
Role of WHO in environmental health
Different bodies of public health organization
Human environment status in urban and rural India
5. What is risk assessment? Describe in detail the steps involved in risk
assessment. 2+8=10
OR
Give an account of any two of the following 5×2=10
Main components of eradication programs
Ultrafiltration
Reverse osmosis