1.     It is only a reasonable working presumption that the effect or response being observed is a result of exposure to the known concentration of                       .

·       substrate

·       Chemical

·       Mixture

·       Pheromones

2.     Chemical substances can have undesirable or distinctly harmful effects cause

·       Lethal effect

·       Sub lethal  effects

·       Accelerator effect

·       Abscopal effect

3.     Chemical substance taken up by an organism in sufficient amount over                   time period cause lethal effect.

·       Short

·       Long

·       Very short

·       Very long

4.     When taken up by organism in small amount over                 time period.

·       Short

·       Long

·       Very short

·       Very long

5.                             is completely safe and no chemical is completely harmful.

·       Pheromones

·       Hormones

·       Mixture

·       Chemical

6.     One factor that determines whether a chemical agent is potentially harmful or safe is the relationship between                      of the exposure.

·       Concentration and duration

·       Concentration and viscosity

·       Viscosity and duration

·       Concentration , viscosity and duration

7.     Dose response is also known as

·       Concentration response

·       Medicated response

·       Lethal response

·       Exposure response

8.                                     describes the magnitude of the response of an organism.

·       Concentration response

·       Medicated response

·       Lethal response

·       Dose response

9.     In                             toxicology the key principle that measure the severity of the response is termed the Dose response relationship as toxicant is usually introduced orally as a bolus or dose into the body of the organism.

·       Mammalian

·       Aquatic

·       Terrestrial

·       None

10.  In                          toxicology where exposure is usually via waterborne concentration of the toxicant, this basic principle is referred to as the concentration-response relationship.

·       Mammalian

·       Aquatic

·       Terrestrial

·       None

11.  If the concentration of any toxic effect is                      then the effect is not so harmful.

·       Minimum

·       Maximum

·       Adverse

·       All above

12.  All chemicals are capable of producing a deleterious effect if                                                              what conc.

·       High

·       Low

·       Maximum

Both a and c