M.Sc. (Semester IV) (CBCS) Examination Oct/Nov-2017
Environmental Science
ENVIRONMENTAL TOXICOLOGY AND SAFETY
Day Date: Monday, 20-11-2017 Max. Marks: 70
Time: 02.30 PM to 05.00 PM
Instructions: Answer any Five Question.
All Questions carry equal marks.
Question No. 1 is Compulsory.
Attempt any two from Q.No.2, and 4.
Attempt any two from Q.No.5, 6 and 7.
Q.1 Select the answer among the following 14
Natural source of Polycyclic Aromatic Hydrocarbons (PAHs) is
Root exudates Anaerobic bacteria
Aerobic bacteria Grass fires
The band labeled as which is lethal to microorganisms is
0.29 0.32 0.2 0.29
0.17 0.2 0.07 0.21
Which of the following dose not include in ecological monitoring in the
assessment of effect of toxicants?
Bioaccumulation Ecological population dynamics
Bioassay Habitat protection
QSAR stand for in toxicological studies
Quality Standardization and assured results
Quantitative structure-activity relationship
Quality for safe and reliable assessment
None of the above
The biodegradability of xenobiotics can be characterized by
Rate of CO2 formation Rate of O2 Consumption
Ratio of BOD and COD All of these
is a phytotoxins.
Ochratoxin A Ricin
Citrinin All the above
is a strong characterized radioactive waste.
Sr90 DDT
I 131 All of these
A hazardous waste is characterized by
Ignitibility Toxicity
Reactivity All of these
Therapeutic index is determined by using the formula
EC 50 LD 50 LD 50 ED 50
LDi ED 99 None of these
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SLR-MI-414
10) Which pollutant among the following is the most destructive to nervous
systems?
SO2 Lead
CO None of these
11) The branch of toxicology which examines the effect of chemicals on
immune system is
Immune toxicology Molecular toxicology
Ecotoxicology None of these
12) The progressive increase in concentration of xenobiotic compound,
when it passes through the food chain is celled as:
Bio magnification Bioaccumulation
Hyper accumulation None of the above
13) The substances which affect foetal development are called as:
Carcinogens Teratogens
Mutagens Sarcinogens
14) Formation of car boxy hemoglobin is a process involving reaction of:
Lead with hemoglobin
Arsenic with hemoglobin
Nitrogen with hemoglobin
Carbon monoxide with hemoglobin
Q.2 Define toxicant. Give the list of toxic chemicals in the environment. Indicate
their sources and toxic actions?
14
Q.3 Discuss the toxic responses of the respiratory system with suitable
example?
14
Q.4 What are personal protective equipments? Give its types and advantages? 14
Q.5 Write a short note on following: 14
Bioassay
Animal toxins and Phytotoxins
Q.6 Write in brief on the following: 14
Effects of toxicants on ecosystems.
Detoxification of toxicant.
Q.7 Write an account on the following: 14
TLC
Need of occupational safety