Animal Ecotoxicology MCQS January 8, 2026March 26, 2024 by u930973931_answers 26 min Score: 0 Attempted: 0/26 Subscribe 1. What is ecotoxicology? (A) The study of animal behavior in natural habitats (B) The study of the effects of pollutants on ecosystems and animal populations (C) The study of interactions between animals and their predators (D) The study of animal adaptation to environmental changes 2. What is a pollutant in the context of ecotoxicology? (A) Any natural substance found in the environment (B) Any substance that has a beneficial effect on ecosystems (C) Any substance that promotes animal growth (D) Any substance that harms living organisms or ecosystems 3. Which of the following is an example of a chemical pollutant? (A) Oxygen (B) Carbon dioxide (C) Water (D) Lead 4. What is biomagnification in ecotoxicology? (A) The decrease in pollutant concentration up the food chain (B) The increase in pollutant concentration up the food chain (C) Adaptation of animals to pollutants (D) Study of soil pollutants 5. How does bioaccumulation differ from biomagnification? (A) Bioaccumulation decreases pollutants, biomagnification increases them (B) Bioaccumulation is aquatic only (C) Both terms mean the same thing (D) Bioaccumulation increases pollutant levels in organisms, biomagnification increases them across trophic levels 6. What is the role of detoxification enzymes in animals? (A) Reduce pollutant toxicity and concentration (B) Increase pollutant levels (C) Stimulate growth (D) Regulate temperature 7. How do heavy metals like mercury and lead affect animals? (A) No effect (B) Promote growth (C) Improve immunity (D) Cause toxicity and organ damage 8. What is the primary route of pollutant exposure in aquatic animals? (A) Inhalation (B) Ingestion (C) Dermal contact (D) None 9. What does acute toxicity refer to? (A) Long-term exposure (B) Health promotion (C) Natural adaptation (D) Short-term exposure to high pollutant levels 10. Which is a persistent organic pollutant (POP)? (A) Polychlorinated biphenyls (PCBs) (B) Sulfur dioxide (C) Carbon dioxide (D) Oxygen 11. What is the role of bioindicators? (A) Assess environmental quality and pollution (B) Reduce pollution (C) Increase pollution (D) Regulate temperature 12. How does habitat destruction worsen ecotoxicological issues? (A) Lowers pollutants (B) Promotes adaptation (C) Disrupts ecosystems and increases pollutant vulnerability (D) Improves air quality 13. What is the main concern with endocrine disruptors? (A) Hormonal disruption affecting development and reproduction (B) Improved reproduction (C) Reduced pollutants (D) Increased biodiversity 14. Which is a terrestrial pollutant? (A) Oil spills (B) Noise pollution (C) Heavy metals in water (D) Pesticides 15. How does eutrophication cause ecotoxicological problems? (A) Lowers nutrients (B) Improves biodiversity (C) Improves water quality (D) Causes oxygen depletion and algal blooms 16. Why are microplastics important in ecotoxicology? (A) No impact (B) Harm organisms and enter food chains (C) Improve water quality (D) Reduce pollution 17. How does climate change affect ecotoxicology? (A) No effect (B) Promotes adaptation (C) Reduces biodiversity only (D) Alters pollutant distribution and toxicity 18. What do bioaccumulation factors (BAFs) indicate? (A) Increase in pollutants (B) Decrease in pollutants (C) Temperature regulation (D) Potential for pollutants to accumulate in organisms 19. Which is a non-persistent organic pollutant? (A) DDT (B) PCBs (C) Heavy metals (D) Microplastics 20. How do pesticides raise ecotoxicological concerns? (A) Promote biodiversity (B) Improve soil quality (C) Harm non-target species and bioaccumulate (D) Reduce pollution 21. What is the role of ecotoxicological risk assessment? (A) Increase pollutants (B) Identify hazards and assess ecological risks (C) Reduce pollutants directly (D) Regulate temperature 22. Why are nanoparticles a concern in aquatic systems? (A) Improve water quality (B) Reduce pollutants (C) Unknown toxic effects on organisms (D) Increase biodiversity 23. What is the main concern of microplastics in terrestrial ecosystems? (A) Improve soil quality (B) Increase biodiversity (C) Reduce pollution (D) Harm soil organisms and enter food chains 24. How do temperature changes affect aquatic pollutant toxicity? (A) Affect solubility and toxicity of pollutants (B) No effect (C) Reduce pollutants (D) Promote biodiversity 25. What is hormesis in ecotoxicology? (A) Beneficial pollution (B) Reduced pollutants (C) Low-dose stimulation and high-dose toxicity (D) Adaptation only 26. How does habitat fragmentation affect wildlife ecotoxicology? (A) Isolates populations and increases pollutant vulnerability (B) Improves habitats (C) Reduces pollution (D) Promotes biodiversity