This quiz works best with JavaScript enabled. Home > Cbse > Class 12 > Science > Biology > Class 12 Biology Chapter 14 Ecosystem – Quiz 4 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 14 Ecosystem Quiz 4 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. (True or False)-Autotrophs are organisms that can undergo Photosynthesis to make their own nutrients such as plants and trees. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 2. Unlike plants, animals cannot make their own food. How do animals obtain the energy they need? A) Animals eat other organisms. B) Animals collect solar energy. C) Animals absorb chemicals from the environment. D) Animals are able to function without taking energy in from their environment. Show Answer Correct Answer: A) Animals eat other organisms. 3. Which of the following is a primary source of energy for most ecosystems? A) Solar energy. B) Wind. C) Geothermal energy. D) Nuclear energy. Show Answer Correct Answer: A) Solar energy. 4. All of the different species of living things in a given area is called: A) Biome. B) Ecosystem. C) Population. D) Community. Show Answer Correct Answer: D) Community. 5. Which of the following is a correct pair of cycles? A) Water cycle and sulfur cycle. B) Oxygen and carbon cycle and nitrogen cycle. C) Phosphorus cycle and sulfur cycle. D) Water cycle and sulfur cycle. Show Answer Correct Answer: B) Oxygen and carbon cycle and nitrogen cycle. 6. Which of the following terms describes an organism that is able to make organic compounds from inorganic nutrients? A) Autotroph. B) Consumer. C) Saprotroph. D) Detritivore. Show Answer Correct Answer: A) Autotroph. 7. Describe the different levels of a trophic pyramid in a food chain. A) Producers, Primary Consumers, Secondary Consumers. B) Plants, Insects, Birds. C) Herbivores, Carnivores, Omnivores. D) Decomposers, Detritivores, Scavengers. Show Answer Correct Answer: A) Producers, Primary Consumers, Secondary Consumers. 8. A pyramid of biomass is one way to model an ecosystem. How does the amount of biomass generally change from the bottom of the pyramid to the top? A) The amount of biomass decreases. B) The amount of biomass increases. C) The amount of biomass varies only slightly, and may increase or decrease. D) The amount of biomass varies widely, and both increases and decreases. Show Answer Correct Answer: A) The amount of biomass decreases. 9. How do decomposers contribute to an ecosystem? A) Decomposers have no role in the ecosystem. B) They break down dead organisms and organic matter, recycling nutrients back into the environment. C) They help in the process of photosynthesis in plants. D) They contribute by creating new organisms in the ecosystem. Show Answer Correct Answer: B) They break down dead organisms and organic matter, recycling nutrients back into the environment. 10. What do decomposers do in a food chain? A) Produce energy for the ecosystem. B) Eat plants and other animals. C) Help put nutrients back into the soil. D) Convert energy from the sun into food. Show Answer Correct Answer: C) Help put nutrients back into the soil. 11. Prefix that means life. A) Aquatic. B) Terrestrial. C) Biology. D) Bio. Show Answer Correct Answer: D) Bio. 12. What are trophic levels? A) Each step in a food chain or food web. B) Levels of population growth. C) Different habitats. D) Only producers. Show Answer Correct Answer: A) Each step in a food chain or food web. 13. In any food chain, the first trophic level is occupied by: A) Keystone species. B) Herbivores. C) Producers. D) Secondary consumer. Show Answer Correct Answer: C) Producers. 14. Click Here to Access the ReadingGo to Reading 4According to READING 4, which of the following statements is BEST reflected by the data? A) African Buffalo require more dry leaves in their diet than other animals. B) African Buffalo require more green leaves in their diet than other animals. C) African buffalo have the same diet as other animals. D) African buffalo require more other plant parts in their diet than other animals. Show Answer Correct Answer: B) African Buffalo require more green leaves in their diet than other animals. 15. What is lost between trophic levels and cannot be recycled? A) Biomass. B) Heat. C) Carbon compounds. D) Nitrogen. Show Answer Correct Answer: B) Heat. 16. Unlike energy, matter is not constantly added to ecosystems. Instead, it is recycled. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 17. Which option correctly describes predator and prey? A) Both predator and prey perform photosynthesis. B) Predator hunts and kills; prey is killed for food. C) Predator is hunted; prey hunts and kills. D) None of the above. Show Answer Correct Answer: B) Predator hunts and kills; prey is killed for food. 18. In which of the following ecosystems can you find fertile, rich soil? A) Grasslands. B) Wetlands. C) Oceans. D) None of the above. Show Answer Correct Answer: A) Grasslands. 19. A snake is an example of a(n) A) Invertebrate. B) Vertebrate. C) All the above. D) None of the above. Show Answer Correct Answer: B) Vertebrate. 20. Photosynthesis uses the green pigment molecule called ..... A) Chloroplast. B) Chlorophyll. C) Stem. D) None of the above. Show Answer Correct Answer: B) Chlorophyll. 21. What is the term for each step in the transfer of energy and matter within a biological community? A) Energy path. B) Food pyramid. C) Trophic level. D) Food web. Show Answer Correct Answer: C) Trophic level. 22. True or False:A keystone species has a powerful influence on an ecosystem A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 23. Which type of symbiosis involves both species benefitting? +/+ A) Mutualism. B) Commensalism. C) Parasitism. D) None of the above. Show Answer Correct Answer: A) Mutualism. 24. The ..... zone is the place where the ocean meets the land. A) Oceanic. B) Neritic. C) Intertidal. D) Benthic. Show Answer Correct Answer: C) Intertidal. 25. An area where fresh water from streams and rivers spills into the ocean is called an ..... A) Coral reefs. B) Estuary. C) Sargassums. D) Plankton. Show Answer Correct Answer: B) Estuary. 26. Berikut ini yang tergolong organisme heterotrof adalah ..... A) Ganggang. B) Tali putri. C) Tumbuhan paku. D) Lumut. Show Answer Correct Answer: B) Tali putri. 27. What is one of the toxic compounds that can be associated with mining? A) Mercury. B) Salt. C) Oxygen. D) Carbon dioxide. Show Answer Correct Answer: A) Mercury. 28. An example of a cause of changes in nutrient cycles is ..... A) Flooding. B) Storms. C) Pollution. D) None of the above. Show Answer Correct Answer: C) Pollution. 29. A symbiotic relationship where both organisms benefit A) Symbiosis. B) Parasitism. C) Commensalism. D) Mutualism. Show Answer Correct Answer: D) Mutualism. 30. How does the amount of energy change as it moves up an energy pyramid A) It increases. B) It decreases. C) It stays the same. D) None of the above. Show Answer Correct Answer: B) It decreases. 31. What are ecosystem services? A) Products obtained from ecosystems. B) Services provided by technology. C) Benefits that animals obtain from ecosystems. D) Benefits that humans obtain from ecosystems. Show Answer Correct Answer: D) Benefits that humans obtain from ecosystems. 32. Which of the following do all living things contain but non-living things do not? A) Minerals. B) Elements. C) Molecules. D) Cells. Show Answer Correct Answer: D) Cells. 33. Which of the following is not an abiotic factor in the prairie ecosystem? A) Water. B) Grass. C) Soil. D) Sunlight. Show Answer Correct Answer: B) Grass. 34. Animals need other ..... and ..... to grow and thrive. A) Animals. B) Plants. C) Homes. D) Humans. E) Areas. Show Answer Correct Answer: A) Animals. 35. ..... make their own food. A) Herbivores. B) Consumers. C) Carnivores. D) Producers. Show Answer Correct Answer: D) Producers. 36. What was one of the reasons early humans studied plants? A) To recognize poisonous plants. B) To make clothing. C) To build houses. D) To use them for decoration. Show Answer Correct Answer: A) To recognize poisonous plants. 37. Living things not naturally found in the ecosystem that cause damage and throw off the balance of the ecosystem are invasive species. A) True. B) False. C) X. D) X. Show Answer Correct Answer: A) True. 38. The framework of organic molecules essential to all organisms is composed mainly of carbon atoms. Which processes are involved in the cycling of carbon within an environment? A) Diffusion and transpiration. B) Evaporation and condensation. C) Transcription and translation. D) Photosynthesis and respiration. Show Answer Correct Answer: D) Photosynthesis and respiration. 39. Habitat restoration A) Actions taken to repair and rebuild damaged ecosystems. B) A method of urban development that prioritizes green spaces. C) A process of introducing non-native species to an area. D) A technique for increasing agricultural productivity. Show Answer Correct Answer: A) Actions taken to repair and rebuild damaged ecosystems. 40. A/An ..... refers to the role of a species in its ecosystem. A) Ecology. B) Niche. C) Habitat. D) Factor. Show Answer Correct Answer: B) Niche. 41. The smallest ecosystem such as a mud puddle or under a log A) Micro ecosystem. B) Messo ecosystem. C) Biome. D) None of the above. Show Answer Correct Answer: A) Micro ecosystem. 42. Which of the following describes a enzyme? A) A protein that speeds up chemical reactions. B) A type of molecule that codes for our genetic information. C) All the above. D) None of the above. Show Answer Correct Answer: A) A protein that speeds up chemical reactions. 43. How large is the average Canadian's ecological footprint? A) 1 football field. B) 17 football fields. C) 10 football fields. D) 107 football fields. Show Answer Correct Answer: C) 10 football fields. 44. What equipment is used to estimate the number of ground crawling insects? A) Quadrat. B) Pitfall trap. C) Transect. D) Net. Show Answer Correct Answer: B) Pitfall trap. 45. What is the current geological time period referred to in the video? A) Holocene. B) Pleistocene. C) Anthropocene. D) Mesozoic. Show Answer Correct Answer: C) Anthropocene. 46. Which term best describes all living and non-living components interacting together in a given area? A) Habitat. B) Ecosystem. C) Community. D) Population. Show Answer Correct Answer: B) Ecosystem. 47. What are the two main types of ecosystems that exist? A) Urban and forest. B) Natural and artificial. C) Terrestrial and aquatic. D) Natural and industrial. Show Answer Correct Answer: B) Natural and artificial. 48. What is one of the impacts of climate change discussed? A) Decrease in global temperatures. B) Increased urbanization. C) Stabilization of ecosystems. D) Increased frequency and severity of natural disasters. Show Answer Correct Answer: D) Increased frequency and severity of natural disasters. 49. Food molecules in an ecosystem can be traced back to ..... A) Plants. B) The sun. C) The ground. D) None of these. Show Answer Correct Answer: B) The sun. 50. Small pieces of dead or decaying plant or animal remains A) Biomass. B) Detritus. C) Energy pyramid. D) None of the above. Show Answer Correct Answer: B) Detritus. 51. Camouflage typically evolves as a result of A) Predation. B) Mutualism. C) Interspecific competition. D) Herbivory. Show Answer Correct Answer: A) Predation. 52. Which step of the water cycle follows liquid evaporating and changing to water vapour? A) Vapour condenses and forms ice crystals or water droplets. B) Water enters lakes, oceans, the soil or groundwater. C) Water droplets fall to the Earth as rain, hail or snow. D) Water droplets collect and form clouds. Show Answer Correct Answer: A) Vapour condenses and forms ice crystals or water droplets. 53. Carnivores, herbivores, omnivores, and scavengers are all examples of ..... A) Producers. B) Decomposers. C) Consumers. D) Abiotic factors. Show Answer Correct Answer: C) Consumers. 54. An organism that eats only plants. A) Herbivore. B) Carnivore. C) Omnivore. D) Producer. Show Answer Correct Answer: A) Herbivore. 55. What is the ultimate source of energy in any food chain? A) Producers. B) Consumers. C) The sun. D) Decomposers. Show Answer Correct Answer: C) The sun. 56. What did the Natural History Museum report about species diversity? A) It is increasing rapidly. B) It is stable. C) It is critically low in 58% of land ecosystems. D) It has no correlation with human activity. Show Answer Correct Answer: C) It is critically low in 58% of land ecosystems. 57. Define mutualism in ecological terms. A) Mutualism is a relationship where one species benefits at the expense of another. B) Mutualism is a symbiotic relationship where both species benefit. C) Mutualism is a type of competition between two species for resources. D) Mutualism is a relationship where both species are harmed. Show Answer Correct Answer: B) Mutualism is a symbiotic relationship where both species benefit. 58. Last level of Organization A) Organs. B) Organism. C) Organ System. D) Tissues. E) Cells. Show Answer Correct Answer: B) Organism. 59. Methanogens produce methane gas. What is the gas converted to in the atmosphere? A) Carbon dioxide and oxygen. B) Ethanol and carbon dioxide. C) Carbon monoxide and ozone. D) Carbon dioxide and water. Show Answer Correct Answer: D) Carbon dioxide and water. 60. What is NOT a factor contributing to the bleaching of the Great Barrier Reef? A) Rates of fishing. B) Changes in sea water acidity. C) Decrease in sea water temperatures. D) Increased sedimentation from runoff. Show Answer Correct Answer: C) Decrease in sea water temperatures. ← PreviousNext →Related QuizzesScience QuizzesClass 12 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 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 9 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books