This quiz works best with JavaScript enabled. Home > Science > Ecology – Quiz 76 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Ecology Quiz 76 (20 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Your A) My. B) Our. C) Their. D) Your. Show Answer Correct Answer: D) Your. 2. Why are there fewer organisms in each level as you go up the energy pyramid? A) There is more energy available at higher levels. B) Higher levels have more mean animals. C) There is less energy availabe at higher levels. D) Coyotes get hungrier. Show Answer Correct Answer: C) There is less energy availabe at higher levels. 3. Which nitrogen cycle process breaks down atmospheric nitrogen (N2) and combines it with hydrogen or oxygen using bacteria or lightning strikes A) Nitrogen fixation. B) Ammonification. C) Nitrification. D) Denitrification. Show Answer Correct Answer: A) Nitrogen fixation. 4. Which of these is NOT an abiotic factor? A) Water. B) Air. C) Temperature. D) Bones. Show Answer Correct Answer: D) Bones. 5. Which of these is most likely to happen in an ecosystem if all of the primary consumers are removed from an ecosystem? A) Other primary consumers will take their places. B) Secondary consumers will decrease in numbers. C) Producers will decrease in numbers. D) None of above. Show Answer Correct Answer: B) Secondary consumers will decrease in numbers. 6. What role do decomposers play in the carbon cycle? A) Absorb carbon dioxide. B) Release carbon dioxide into atmosphere. C) Release carbon into the soil. D) Combustion. Show Answer Correct Answer: C) Release carbon into the soil. 7. When too much SO2 and NO2 are released into the atmosphere, this will result A) Nutrient rain. B) Soil erosion. C) Acid rain. D) Fewer clouds. Show Answer Correct Answer: C) Acid rain. 8. What are the main sources of water pollution? A) Agriculture (farming) and industry. B) Snails in water. Show Answer Correct Answer: A) Agriculture (farming) and industry. 9. Several owls live in a forest. The owls prey on mice. Hawks also prey on mice. Which might happen if several hawks move to the forest where the owls live? A) The number of owls will increase, and the number of hawks will decrease. B) The number of mice will increase, and the number of owls will decrease. C) The number of owls and hawks will increase. D) The number of owls and mice will decrease. Show Answer Correct Answer: D) The number of owls and mice will decrease. 10. What growth pattern describes a population whose growth rate slows or stops following a period of exponential growth? A) Logistic growth. B) Population growth. C) Exponential growth. D) Predator-prey cycle. Show Answer Correct Answer: A) Logistic growth. 11. In an ecosystem, living things are called ..... and non-living things are called ..... A) Biotic, abiotic. B) Abiotic, biotic. C) Organisms, decomposers. D) Herbivores, decomposers. Show Answer Correct Answer: A) Biotic, abiotic. 12. The lowest level of organization is called: A) Community. B) Organism. C) Biosphere. D) None of above. Show Answer Correct Answer: B) Organism. 13. All of the biotic and abiotic factors. A) Community. B) Ecosystem. C) Population. D) None of above. Show Answer Correct Answer: B) Ecosystem. 14. A species that still needs to be protected but is not an immediate danger of becoming extinct. A) Evolutionary species. B) Biological species. C) Threatened species. D) Endangered species. Show Answer Correct Answer: C) Threatened species. 15. Organisms that need to consume food from another source A) Consumers. B) Producers. Show Answer Correct Answer: A) Consumers. 16. How nitrogen is "fixed" into a useable form for plants ..... A) Through action of bacteria only. B) Through lightning only. C) Through action of bacteria & lightning. D) Through photosynthesis. Show Answer Correct Answer: C) Through action of bacteria & lightning. 17. These organisms break down the remains of dead organisms and return their nutrients to the environment A) Animal. B) Decoposer. C) Carnivore. D) Scavenger. Show Answer Correct Answer: B) Decoposer. 18. In which year was the term biocenosis introduced? A) 1869. B) 1935. C) 1940. D) 2000. E) 1877. Show Answer Correct Answer: E) 1877. 19. What is a trophic level? A) Feeding position in a food chain or food web, such as producer, primary consumer, or secondary consumer. B) The decrease in biomass from lower to higher levels. Show Answer Correct Answer: A) Feeding position in a food chain or food web, such as producer, primary consumer, or secondary consumer. 20. The rainforest has the greatest variety of different organisms that live there. In other words, the rainforest has the greatest ..... A) Speciation. B) Biodiversity. C) Climate. D) Succession. Show Answer Correct Answer: B) Biodiversity. ← PreviousNext →Related QuizzesEcology Quiz 1Ecology Quiz 2Ecology Quiz 3Ecology Quiz 4Ecology Quiz 5Ecology Quiz 6Ecology Quiz 7Ecology Quiz 8Ecology Quiz 9Ecology Quiz 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books