This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Biology Chapter 14 Ecosystem – Quiz 44 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 14 Ecosystem Quiz 44 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Occurs in an area in which no trace of a previous community is present A) Primary succession. B) Secondary succession. C) Niche. D) None of the above. Show Answer Correct Answer: A) Primary succession. 2. An ..... is an interwoven system of biotic and abiotic factors. A) Species. B) Ecosystem. C) Microscope. D) Zoo. Show Answer Correct Answer: B) Ecosystem. 3. What are primary consumers? A) Carnivores. B) Herbivores. C) Omnivores. D) Producers. Show Answer Correct Answer: B) Herbivores. 4. Which organism can make its own food using the sun's energy? A) Consumer. B) Producer. C) Decomposer. D) Scavenger. Show Answer Correct Answer: B) Producer. 5. Biodiversity A) The variety of life in the world or in a particular habitat or ecosystem. B) Carnivores that eat other carnivores. C) An organism that feeds on primary producers. Herbivores. D) Any step in a nutritive series, or food chain, of an ecosystem. Organisms are classified into levels on the basis of their feeding behavior. Show Answer Correct Answer: A) The variety of life in the world or in a particular habitat or ecosystem. 6. What is a keystone species? A) A species that is introduced to an ecosystem. B) A species which plays a central role in an ecosystem. C) A species that has no impact on its ecosystem. D) A species that is most common in an ecosystem. Show Answer Correct Answer: B) A species which plays a central role in an ecosystem. 7. What is the term used for the first organisms to colonize an area affected by a volcanic eruption? A) Keystone species. B) Intermediate species. C) Pioneer species. D) Climax community. Show Answer Correct Answer: C) Pioneer species. 8. Scientists have observed that all cheetahs have very similar body structures, markings, and other physical traits. These observations provide evidence for which conclusion? A) Cheetahs have low genetic diversity. B) Cheetahs have low species diversity. C) Cheetahs have high genetic diversity. D) Cheetahs are minimally affected by biodiversity. Show Answer Correct Answer: A) Cheetahs have low genetic diversity. 9. Which of the following terms refers to the specific role an organism plays within an ecosystem, including what it eats and its interactions with other organisms? A) Community. B) Ecological niche. C) Population. D) Habitat. Show Answer Correct Answer: B) Ecological niche. 10. How does the predator-prey relationship affect a population? A) The predators and prey are in competition with each other. B) Usually either the predator or the prey will become extinct. C) The predator species usually has exponential growth. D) The relationship controls the population size of both species. Show Answer Correct Answer: D) The relationship controls the population size of both species. 11. Which of the following statements is true about natural systems? A) Consumers form the bottom level of the energy pyramid and at the start of a food chain. B) Producers are at the bottom level of the energy pyramid and the start of a food chain. C) Producers are at the bottom of the energy pyramid, but at the end of a food chain. D) Consumers are at the bottom of the energy pyramid, but at the top of a food chain. Show Answer Correct Answer: B) Producers are at the bottom level of the energy pyramid and the start of a food chain. 12. What is a key feature of kangaroos that allows them to survive on poor quality grasses? A) Sequential eruption of their teeth. B) Breathing underwater. C) Ability to fly short distances. D) Camouflage in the Australian bush. Show Answer Correct Answer: A) Sequential eruption of their teeth. 13. In the food chain, what role do decomposers play? A) Decomposers are responsible for pollination in plants. B) Decomposers are predators that feed on other organisms. C) Decomposers break down dead organisms and organic matter. D) Decomposers help plants grow by providing nutrients. Show Answer Correct Answer: C) Decomposers break down dead organisms and organic matter. 14. The food web starts from A) Animals. B) Plants. C) Bacteria. D) Fungi. Show Answer Correct Answer: B) Plants. 15. What is the role of a keystone species in an ecosystem? A) A keystone species has a disproportionately large effect on its environment relative to its abundance. B) A keystone species is the most abundant species in an ecosystem. C) A keystone species is always a predator that controls the population of other species. D) A keystone species is a species that is at the top of the food chain. Show Answer Correct Answer: A) A keystone species has a disproportionately large effect on its environment relative to its abundance. 16. What form of energy is in the food organisms consume? A) Chemical energy. B) Thermal energy. C) Mechanical energy. D) Radiant energy. Show Answer Correct Answer: A) Chemical energy. 17. Carbon and other nutrients becomes usable to other organisms by A) Decomposition of dead organisms. B) Evaporation of water. C) Combustion of fossil fuels. D) Transpiration from trees. Show Answer Correct Answer: A) Decomposition of dead organisms. 18. (a):Living factors in an ecosystem include plants, animals, bacteria, fungi, etc. A) A. Biotic Factors. B) Abiotic Factors. C) All the above. D) None of the above. Show Answer Correct Answer: A) A. Biotic Factors. 19. Salt Concentration A) Biotic. B) Abiotic. C) All the above. D) None of the above. Show Answer Correct Answer: B) Abiotic. 20. Which of the following describes an interconnection of food chains in an ecosystem? A) Food chain. B) Food web. C) Energy pyramid. D) Producer web. Show Answer Correct Answer: B) Food web. 21. The Carbon Cycle involves the process of ..... A) Biotic factors and abiotic factors. B) Photosynthesis and cellular respiration. C) Autotrophs and heterotrophs. D) None of the above. Show Answer Correct Answer: B) Photosynthesis and cellular respiration. 22. A(n) ..... shows interconnected food chains. A) Energy pyramid. B) Tropic level. C) Food web. D) Feeding diagram. Show Answer Correct Answer: C) Food web. 23. An environmental factor such as predation, disease, and competition that depends on the number of members in a population per unit A) Dispersion. B) Density-independent factor. C) Density-dependent factor. D) Population growth rate. Show Answer Correct Answer: C) Density-dependent factor. 24. Which of the following is an example of a provisioning ecosystem service? A) Mining of minerals in a forest ecosystem. B) Production of crops or fish in an agricultural or aquatic ecosystem. C) Hunting of animals in a grassland ecosystem. D) Logging of trees in a wetland ecosystem. Show Answer Correct Answer: B) Production of crops or fish in an agricultural or aquatic ecosystem. 25. Barnacles are animals that cannot move. In order to get food, they attach to whales and catch any floating plankton in the water. The whale is neither helped nor harmed in the interaction. What type of symbiosis is this? A) Mutualism. B) Commensalism. C) Parasitism. D) Amensalism. Show Answer Correct Answer: B) Commensalism. ← PreviousNext →Related QuizzesClass 12 Biology Chapter 14 Ecosystem Quiz 1Class 12 Biology Chapter 14 Ecosystem Quiz 2Class 12 Biology Chapter 14 Ecosystem Quiz 3Class 12 Biology Chapter 14 Ecosystem Quiz 4Class 12 Biology Chapter 14 Ecosystem Quiz 5Class 12 Biology Chapter 14 Ecosystem Quiz 6Class 12 Biology Chapter 14 Ecosystem Quiz 7Class 12 Biology Chapter 14 Ecosystem Quiz 8Class 12 Biology Chapter 14 Ecosystem Quiz 9Class 12 Biology Chapter 14 Ecosystem Quiz 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books