M.Sc. Environmental Science (Semester IV) (CBCS)
Examination, 2017
Environmental Toxicology and Safety
Day Date: Friday, 21-04-2017 Max. Marks: 70
Time: 02.30 PM to 05.00 PM
N.B. Answer any Five Question
All Questions carry equal marks
Question No. 1 is Compulsory
Attempt any two from Q.No.2,3,and 4
Attempt any two from Q.No.5,6 and 7
Draw neat and labeled diagrams wherever necessary.
Q.1 Select the answer among the following 14
Acid precipitate kills fish by release of:
Al ions Anticoagulants
Carbon monoxide Mercury
The major cause of drop in human sperm count observed
since last 60 years is due to:
Environmental estrogen Environmental mutagens
Environmental androgens Environmental teratogens
Pollutant causing leaf curling:
SO2 CO
H2S O3
Use of DDT is undesirable because, it is:
Harmful Accumulate in food chain
Degradable Causes mutation
The cigarette smoke contains the … and … as major
pollutants/ toxicants;
Co and Dioxin Benzene and CO
Nicotine and CO Dioxin and Benzene
Having a sudden onset, lasting a short time effect called as:
Acute Lethal
Chronic Concentric
Main pollutant in atmospheric air harmful to human health is:
CO NO2
CO2 SO2
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Test used to evaluate the relative potency of a chemical by
comparing its effect on a living organism with the effect of
standard preparation on the same type of organism called as:
Biomonitoring Bioconcentration
Bioassay Bioactivation
The impact on human health like black lung and urban
emphysema are caused mainly by:
Methane Particulates
SO2 All of these
10) Natural source of Polycyclic Aromatic Hydrocarbons (PAHS) is
Root exudates Anaerobic bacteria
Aerobic bacteria Grass fires
11) The band labeled as which is lethal to microorganisms

0.29- 0.32 0.2- 0.29
0.17-0.2 0.07-0.21
12) Which of the following does not include in ecological monitoring in
the assessment of effect of toxicants?
Bioaccumulation Bioassay
Ecological population dynamics Habitat protection
13) QSAR stands for ……. in toxicological studies
Quality Standardization and assured results
Quantitative structure-activity relationship
Quality for safe and reliable assessment
None of the above
14) The biodegradability of xenobiotics can be characterized by …..
Rate of CO2 formation Ratio of BOD and COD
Rate of O2 Consumption All of these
Q.2 Define toxicant and toxicity? Give an account of the various
factors that influence the environmental concentration of a
toxicant.
14
Q.3 Define response? Discuss the toxic responses of the
reproductive system?
14
Q.4 What are personal protective equipment? Give its types and
advantages?
14
Q.5 Write a short note on following: 14
A. Hallucinogens B. Phytotoxins and animal toxins
Q.6 Write in brief on the following: 14
A. Adaptation and tolerance level B. Occupational health

Q.7 Write an account on the following: 14
A. TLC B. Safety standards and codes.