Ecotoxicology
Biology ⇒ Ecology and Environment
Ecotoxicology starts at 9 and continues till grade 12.
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See sample questions for grade 11
A scientist finds that the LD50 of a chemical for fish is 10 mg/L. What does this mean?
Describe how heavy metals can enter the food chain and affect human health.
Describe how pesticides can affect non-target species in an ecosystem.
Describe one way in which ecotoxicology is important for environmental policy-making.
Describe the role of indicator species in ecotoxicology.
A lake receives runoff containing a pesticide with a half-life of 30 days. If the initial concentration is 100 mg/L, what will the concentration be after 60 days?
A river near a factory shows a sudden decline in fish population. Which of the following is the most likely cause? (1) Increased rainfall (2) Chemical spill (3) Natural migration (4) Seasonal temperature change
A scientist finds that the LD50 of a chemical for fish is 10 mg/L. What does this mean?
A river near a factory shows a sudden decline in fish population. Which of the following is the most likely cause? (1) Increased rainfall (2) Chemical spill (3) Natural migration (4) Seasonal temperature change
Which of the following best describes the term 'LD50'? (1) The lethal dose for 50% of a test population (2) The legal dose for 50% of a population (3) The lowest dose for 50% of a population (4) The largest dose for 50% of a population
Which of the following is a characteristic of a persistent pollutant? (1) Rapidly degrades (2) Remains in the environment for a long time (3) Is always beneficial (4) Is only found in water
Which of the following is a common method used to assess the toxicity of a chemical in the laboratory? (1) Field observation (2) Bioassay (3) Remote sensing (4) Satellite imaging
Fill in the blank: The ability of an organism to break down or eliminate a toxic substance is called __________.
Fill in the blank: The lowest concentration of a substance that causes a detectable effect in an organism is called the __________.
Fill in the blank: The movement of a toxic substance from the environment into an organism is called __________.
Fill in the blank: The process by which toxic substances become more concentrated at each trophic level in a food chain is called __________.
True or False: All pesticides are biodegradable and do not persist in the environment.
True or False: All toxic substances are synthetic and do not occur naturally.
True or False: Bioaccumulation refers to the increase in concentration of a substance in an organism over time.
True or False: Ecotoxicology only studies the effects of chemicals on individual organisms, not on populations or ecosystems.
