Ecotoxicology
Biology ⇒ Ecology and Environment
Ecotoxicology starts at 9 and continues till grade 12.
QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Ecotoxicology.
How you perform is determined by your score and the time you take.
When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.
See sample questions for grade 12
Describe how pesticides can affect non-target species in an ecosystem.
Describe the role of indicator species in ecotoxicology.
Describe the term 'LC50' in ecotoxicology.
Describe the term 'NOEC' (No Observed Effect Concentration) in ecotoxicology.
Explain the concept of 'dose-response relationship' in ecotoxicology.
Explain the difference between acute and chronic toxicity.
A river receives effluent containing mercury. Over time, fish in the river show high mercury levels, and birds eating these fish have even higher levels. What process does this scenario illustrate? (1) Biodegradation (2) Biomagnification (3) Bioremediation (4) Biofiltration
A scientist is testing the effect of a new chemical on fish. She finds that at 10 mg/L, 50% of the fish die within 96 hours. What is the LC50 for this chemical?
A river receives effluent containing mercury. Over time, fish in the river show high mercury levels, and birds eating these fish have even higher levels. What process does this scenario illustrate? (1) Biodegradation (2) Biomagnification (3) Bioremediation (4) Biofiltration
Which of the following best describes the term 'xenobiotic'? (1) A naturally occurring substance (2) A foreign chemical substance not naturally found in an organism (3) A type of microorganism (4) A nutrient
Which of the following is a characteristic of persistent pollutants? (1) Rapidly degrade (2) Accumulate in organisms (3) Are always beneficial (4) Do not move in the environment
Which of the following is a common effect of endocrine disruptors in wildlife? (1) Enhanced immune response (2) Reproductive abnormalities (3) Increased lifespan (4) Improved vision
Fill in the blank: The ability of an organism to break down or eliminate a toxic substance is called __________.
Fill in the blank: The movement of a toxic substance from one part of the environment to another is called __________.
Fill in the blank: The process by which a toxicant is taken up by an organism from the environment is called __________.
Fill in the blank: The process of using living organisms to clean up contaminated environments is called __________.
True or False: All chemicals are toxic at some dose.
True or False: All pesticides are biodegradable and do not persist in the environment.
True or False: Bioaccumulation refers to the increase in concentration of a substance in an organism over time.
True or False: Sublethal effects of toxicants can include changes in behavior, reproduction, and growth.
