M.Sc. (Semester IV) (CBCS) Examination Nov/Dec-2018
Environmental Science
ENVIRONMENTAL TOXICOLOGY AND SAFETY
Time: 2½ Hours Max. Marks: 70
Instructions: Answer any five questions.
All questions carry equal marks.
Question No.1 is compulsory.
Attempt any two from Q. No. 3 and 4.
Attempt any two from Q. No. 6 and 7.
Scientific calculator is allowed for calculations.
Draw neat and labeled diagram wherever necessary.
Q.1 Rewrite the sentences by choosing correct answer from given alternatives: 14
The ratio of the concentration of a particular chemical in a living organism to
the chemical's concentration in the surrounding water is called as
Biopotential factor Bioavailability factor
Bioconcentration factor Biodegradability factor
are common heavy metal toxins and cause toxicological renal
effects at high levels.
Lead, mercury and Radon Lead, mercury and Nickel
Lead, mercury and cadmium Lead, mercury and Zinc
Full form of DDT is
Dichloro Diphenyl Trichloroethane
Dichloro Diphenyl Trichloromethane
Dichloro Diphenyl Tetrachloroethane
Dichloro Diphenyl Tetrachloromethane
Extremophiles are organisms that live in extreme environments under
High pressures and moderate temperature
High pressures and low temperature
Low pressures and high temperature
High pressures and high temperature
Following are associated with carcinogenicity
Asbestos, dioxins and tobacco smoke
Nickel, dioxins and tobacco smoke
Asbestos, metals and tobacco smoke
Zinc, dioxins and tobacco smoke
Metal-accumulating plants are also known as
Metalloidphytes Metallophytes
Elementophytes Transgenic plants
Following form of mercury caused Minamata disease
Methylene mercury Ethyl mercury
Methyl mercury Ethylene mercury
Which term is used to describe the accumulation of dangerously high levels of
toxins inside cells?
Biomagnifications Synergistic effect
Persistent organic pollutant Bioaccumulation
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SLR-VI-298
Paraquat poisoning causes
Renal failure Respiratory failure
Cardiac failure Multiple organ failure
10) Full form of DGFASLI is
Directorate General Factory Advice Service and Labour Institutes
Directorate General Factory Advice Safety and Labour institutes
Directorate General Factory Advice Service and Law Institutes
Directorate General Factory Advice Safety and Law institutes
11) Which among following is not the most correct objective of national safety
policy?
Continuous reduction in incidence of work related injuries, fatalities,
diseases and disaster
Improved coverage of work related injuries and disease and data base
Continuous enhancement of community awareness regarding EHS at
workplace
Continually developing awareness about environmental protection
12) Among the following is associated with biological hazard
Smoke from burning of organic materials
Poisoned, diseased plants and animals
Ash after incineration
Cigarette smoke
13) Who has responsibility for health and safety at your place of work?
The client and main contractor only
Self employed contractors only and employees
Employers, employees and sub contractors
Everyone at your place of work no matter who employs them
14) Which of the following is more correct for risk assessment
It is a good idea and is essential
Only do it if the job is too risky
It is a legal requirement and must always be carried out prior to starting the
job
Only needs to be done for hazardous work
Q.2 What are the factors that affect toxicity? What are phytotoxins? Discuss various
toxins produced by plants.
14
Q.3 What are mutagens? Discuss various sources of mutagens. What are the
responses shown by different body systems in relation to toxicants?
14
Q.4 What is meant by ecotoxicology? Discuss various routes of entry of toxicants?
Write an account on detoxification mechanisms associated with various
organisms.
14
Q.5 Write a short note on the following: 14
Bioassay techniques
Organisms of Extreme Environment
Q.6 Answer the following:- 14
What are impacts of changing environment on various parts of ecosystem?
Which are the ways to reduce accidents in industries?
Q.7 Answer the following:- 14
Explain interrelationship of safety, health and environmental protection.
Explain the importance of EHS practices in industries.