PESTICIDES
CHAPTER 2.2 ( Case Study )
THINGS TO DO:
• Read Chapter 2.2
• Page 52-57
• Fill in the worksheet
ANSWERS TO WORKSHEET
• QUESTION 1 – Define the following:
• A) Pest – is an organism that people
consider harmful or inconvenient
• Examples:
• Weeds, insects, fungi, and rodents
• B) Pesticide – chemicals designed to kill
pests
• Examples: Raid , DDT
• QUESTION 2 – Complete the table on the
advantages and disadvantages of pesticide
use:
Advantages
Disadvantages
Controls
Pollution
unwanted
populations
Increases Food Bioamplification
Yields
Prevent
diseases
Ecosystem
Decline
(alternates)
• QUESTION 3 – What is the main
difference between first generation and
second generation pesticides?
• 1st Generation – natural chemicals
• 2nd Generation – made in Laboratory
• QUESTION 4 – Complete the table on the
types of pesticides:
Type of
Pesticide
Target
Persistence
Insecticide
Insects
2-15 years
Herbicide
Weeds
Fungicide
Fungi/Moulds
Days to
Weeks
Few Days
Bactericide
Bacteria
Few Days
• QUESTION 5 – Clearly explain
BIOAMPLIFICATION
• Is the increasing concentration of a toxin,
in the fatty tissue, as organisms consume
each other.
• QUESTION 5 B) – Provide an example of
how Bioamplification occurs
• Page 54, Figure 4 provides a good
example
• 1 part per Grasshopper
4 part per
Shrew
12 parts per Owl
• QUESTION 5 C) – What can be done to
prevent Bioamplification?
• Make pesticides that do not stay in the fat
tissue
• Make pesticides that can be extracted
from your body thru urination.
• QUESTION 6 – Reflect and Answer Parts
L-P on pages 56-57
• L) Spruce budworms have become
resistant to the pesticides available. If all
of the pests are not wiped out in the first
wave, the survivors can multiply in
number.
• M) Concentrations of pesticide sufficiently
high to kill all the spruce budworms would
also kill many other species, beneficial as
well as harmful, insects as well as other
organisms.
• N) The loggers and lumber and paper-mill
workers have benefited from the New
Brunswick spraying program.
• O) The loggers, lumber and paper-mill
workers, and First Nations peoples
depending on the forests for a livelihood,
might have lost out as a result of the
decision not to spray on Cape Breton
Island.
• P) Not spraying on Cape breton Island has
allowed the ecosystem to adjust and
naturally recover from the spruce budworm
infestation.