threats to biodiversity-- pesticides
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what is a pest?
any organism that causes illness or harm
what is a pesticide?
a chemical or biological substance that kills pests
what are the 4 types of pesticides?
• herbicide (for plants) • insecticide (for insects) • bactericides (for bacteria) • fungicides (for fungi and mold)
what are 3 benefits to using pesticide?
• grow more crops • reduce cost of food • control disease
what are 4 problems with pesticide?
• bioaccumulation • biomagnification / biological magnification • pesticide resistance • nontarget species
what is bioaccumulation?
the gradual buildup of a substance in an organisms body
what is biomagnification?
the increase in concentration of a substance as it moves higher up the food web.
as trophic level increases, pesticide concentration _____
increases
what is pesticide resistance?
when pesticides are used for a long time, the pest may become resistant to the pesticide.
what is nontarget species?
pesticide sometimes kills off unintended targets which disrupts the food web
we can reduce pesticide pollution by not using pesticide and ______________
suffering damage to crops
we can reduce pesticide pollution by creating ______ _____ pesticide
narrow target
we can reduce pesticide pollution by creating pesticides that ____ _____ into _____ substances after use
break down / harmless
we can reduce pesticide pollution by using biological control, which means ____________
using natural predators