Ecotoxicology
Biology ⇒ Ecology and Environment
Ecotoxicology starts at 9 and continues till grade 12.
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See sample questions for grade 9
Describe one way in which ecotoxicologists test the effects of a chemical on an ecosystem.
Describe one way in which humans can reduce the impact of toxic chemicals on the environment.
Describe the term 'threshold level' in ecotoxicology.
Describe what is meant by the term 'toxicant'.
Explain how oil spills can affect marine life.
A chemical has an LD50 of 10 mg/kg in rats. Is this chemical considered more or less toxic than one with an LD50 of 100 mg/kg? (1) More toxic (2) Less toxic (3) Equally toxic (4) Not enough information
A lake receives runoff containing fertilizer. What is a likely consequence for the aquatic ecosystem? (1) Eutrophication (2) Desertification (3) Deforestation (4) Acidification
A river is contaminated with a chemical that is toxic to fish at concentrations above 0.05 mg/L. If the measured concentration is 0.08 mg/L, is the water safe for fish? (Yes/No)
A chemical has an LD50 of 10 mg/kg in rats. Is this chemical considered more or less toxic than one with an LD50 of 100 mg/kg? (1) More toxic (2) Less toxic (3) Equally toxic (4) Not enough information
A lake receives runoff containing fertilizer. What is a likely consequence for the aquatic ecosystem? (1) Eutrophication (2) Desertification (3) Deforestation (4) Acidification
Which of the following is a chronic effect of exposure to a toxicant? (1) Immediate death (2) Long-term cancer risk (3) Sudden allergic reaction (4) Instant paralysis
Which of the following is a common effect of mercury pollution in aquatic food chains? (1) Increased plant growth (2) Fish deformities (3) Cleaner water (4) Reduced algae
Fill in the blank: Chemicals that disrupt the normal functioning of hormones in organisms are called __________ disruptors.
Fill in the blank: The ability of an organism to break down or eliminate a toxic substance is called __________.
Fill in the blank: The main goal of ecotoxicology is to understand and prevent __________ to living organisms and ecosystems.
Fill in the blank: The movement of a toxic substance from one organism to another through the food web is called __________.
A river is contaminated with a chemical that is toxic to fish at concentrations above 0.05 mg/L. If the measured concentration is 0.08 mg/L, is the water safe for fish? (Yes/No)
True or False: All chemicals released into the environment are toxic to living organisms.
True or False: Bioaccumulation refers to the build-up of toxic substances in an individual organism over time.
True or False: Ecotoxicology only studies the effects of chemicals on animals, not plants.
