This quiz works best with JavaScript enabled. Home > Cbse > Class 12 > Science > Biology > Class 12 Biology Chapter 14 Ecosystem – Quiz 9 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 14 Ecosystem Quiz 9 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. How does the carbon cycle contribute to the balance of gases in the atmosphere? A) The carbon cycle helps regulate the levels of carbon dioxide in the atmosphere, thus contributing to the balance of gases. B) The carbon cycle has no impact on the balance of gases in the atmosphere. C) The carbon cycle only affects the levels of oxygen in the atmosphere. D) The carbon cycle only contributes to the imbalance of gases in the atmosphere. Show Answer Correct Answer: A) The carbon cycle helps regulate the levels of carbon dioxide in the atmosphere, thus contributing to the balance of gases. 2. All of the different populations that live in a specific area. A) Village. B) Community. C) Ecosystem. D) Habitat. Show Answer Correct Answer: B) Community. 3. In the ocean, a sea anemone attaches itself to the shell of a hermit crab. The stinging arms of the sea anemone protect the hermit crab, while the movement of the hermit crab brings food to the sea anemone. Which best describes the relationship between the sea anemone and the hermit crab? A) Mutualism. B) Parasitism. C) Competition. D) Coexistence. Show Answer Correct Answer: A) Mutualism. 4. Habitat is the natural surrounding or the living place of an organism /Habitat ialah persekitaran atau tempat tinggal semula jadi sesuatu organismaIs an aquarium a habitat? A) YES. B) NO. C) All the above. D) None of the above. Show Answer Correct Answer: B) NO. 5. Which of the following describes a consumer? A) Organisms that use photosynthesis. B) Organisms that breathe. C) Organisms that have to eat to survive. D) Organisms that have no known predators. Show Answer Correct Answer: C) Organisms that have to eat to survive. 6. Water is lost to the abiotic parts of the biosphere from the biotic parts by ..... A) Transpiration. B) Precipitation. C) Photosynthesis. D) Infiltration. Show Answer Correct Answer: A) Transpiration. 7. A diagram that shows the amount of energy that moves from one feeding level to another is termed ..... A) Food web. B) Energy pyramid. C) Adaptation. D) Autotroph. Show Answer Correct Answer: B) Energy pyramid. 8. What is the role of chlorella in a food chain? A) To convert energy from the sun into food. B) To provide energy for the body. C) To help put nutrients back into the soil. D) To produce energy for the ecosystem. Show Answer Correct Answer: B) To provide energy for the body. 9. Organism that relies on other organisms for its energy and food supply; also called a heterotroph A) Consumer. B) Producer. C) Energy from the sun. D) None of the above. Show Answer Correct Answer: A) Consumer. 10. What is a series of events in which one organism eats another and obtains energy? A) Food web. B) Food chain. C) Energy pyramid. D) None of the above. Show Answer Correct Answer: B) Food chain. 11. Which of the following is not one of the four cycles mentioned? A) Water cycle. B) Oxygen and carbon cycle. C) Nitrogen cycle. D) Sulfur cycle. Show Answer Correct Answer: D) Sulfur cycle. 12. What is the synonym of biotic?Apakah perkataan sama erti biosis? A) Livinghidup. B) Non-livingtidak hidup. C) All the above. D) None of the above. Show Answer Correct Answer: A) Livinghidup. 13. What will most likely happen if squirrels are removed from the food chain? A) The trees will produce fewer acorns. B) The fox population will decrease. C) The fox will eat acorns. D) The mountain lion population will increase. Show Answer Correct Answer: B) The fox population will decrease. 14. If there were no decomposers, which of the following would most likely happen? A) Plants and animals would remain living for a longer period of time. B) Animals would start carrying out photosynthesis. C) The amount of dead plant and animal matter would decrease. D) Some plants might die due to a shortage of important nutrients. Show Answer Correct Answer: D) Some plants might die due to a shortage of important nutrients. 15. The variety of species found in Earth's land and water ecosystems A) Biosphere. B) Biodiversity. C) Biology. D) Biome. Show Answer Correct Answer: B) Biodiversity. 16. A series of organisms that depend on one another for food. A) Producer. B) Food chain. C) Food web. D) Consumer. Show Answer Correct Answer: B) Food chain. 17. The dry skinned and spiny exoskeleton animals can be seen in A) Forest ecosystem. B) Grassland ecosystem. C) Pond ecosystem. D) Desert ecosystem. Show Answer Correct Answer: D) Desert ecosystem. 18. A biome is ..... A) The height of land above sea level. B) A horizontal movement of ocean water caused by wind that occurs near the ocean's surface. C) A large region characterized by a specific type of climate and certain types of plants and animals. D) Always have higher temperatures than the surrounding countryside. Show Answer Correct Answer: C) A large region characterized by a specific type of climate and certain types of plants and animals. 19. What does the following equation represent? Sunlight +6H20 + 6CO2$\rightarrow$ C6H1206 +6O2 A) Solar energy. B) Photosynthesis. C) Human respiration. D) Cellular respiration. Show Answer Correct Answer: B) Photosynthesis. 20. What significant change occurred as Australia drifted northwards? A) Decrease in land mass. B) Changes in climate and biota. C) Expansion of rainforests. D) Increase in volcanic activity. Show Answer Correct Answer: B) Changes in climate and biota. 21. Density-independent factor: A) Parasites. B) Hurricane. C) Competition. D) Predation. Show Answer Correct Answer: B) Hurricane. 22. Which symbols best describe commensalism? A) 0, 0. B) +, -. C) +, 0. D) +, +. Show Answer Correct Answer: C) +, 0. 23. Which of the following organisms would be in the uppermost trophic level on a trophic pyramid? A) Rabbits. B) Eagles. C) Grass. D) Fish. Show Answer Correct Answer: B) Eagles. 24. Mosquitoes feeding on humans is an example of what type of species interaction? A) Parasitism. B) Predation. C) Commensalism. D) Competition. Show Answer Correct Answer: A) Parasitism. 25. A consumer that only feeds on plants is called A) Omnivore. B) Producer. C) Herbivore. D) Carnivore. Show Answer Correct Answer: C) Herbivore. 26. Describe the role of decomposers in a food chain. A) Decomposers regulate the population of predators in the ecosystem. B) Decomposers create new organisms in the food chain. C) Decomposers help in the process of photosynthesis. D) Decomposers break down dead organisms and organic matter, releasing nutrients back into the ecosystem. Show Answer Correct Answer: D) Decomposers break down dead organisms and organic matter, releasing nutrients back into the ecosystem. 27. An animal that is hunted and killed by another animal for food is ..... A) Prey. B) Predator. C) Decomposer. D) Scavenger. Show Answer Correct Answer: A) Prey. 28. Which organization creates and shares computer modeling systems for evaluating human activity on ecosystems? A) World Health Organization. B) UNESCO. C) United Nations Environmental Program. D) NASA. Show Answer Correct Answer: C) United Nations Environmental Program. 29. How do CFCs affect the ozone layer? A) They strengthen it. B) They cause it to expand. C) They create holes in it. D) They have no effect. Show Answer Correct Answer: C) They create holes in it. 30. Which type of symbiosis involves one species benefitting while the other is harmed? +/- A) Mutualism. B) Commensalism. C) Parasitism. D) None of the above. Show Answer Correct Answer: C) Parasitism. 31. Which is not an element of biodiversity? A) Genetic diversity. B) Species diversity. C) Habitat diversity. D) Ecosystem diversity. Show Answer Correct Answer: C) Habitat diversity. 32. The squirrel eats nuts, seeds, and insects. It builds a nest in a tree. It is eaten by foxes, hawks, and racoons. It buries its food in the ground for storage over the winter-this helps disperse the seeds for plants. It carries diseases that can be spread in the community.This situation best shows the squirrel's ..... A) Community. B) Habitat. C) Ecosystem. D) Niche. Show Answer Correct Answer: D) Niche. 33. Which of the following is an abiotic part of a river that will affect the organisms that currently live in or near the river? A) The algae in the water. B) The predators living near the river. C) The diversity of the life in the river. D) The speed at which the water flows. Show Answer Correct Answer: D) The speed at which the water flows. 34. A tick and a dog have this type of relationship. A) Parasitism. B) Mutualism. C) Neutralism. D) Commensalism. Show Answer Correct Answer: A) Parasitism. 35. Despite their tremendous diversity, all organisms have the same basic needs; energy and matter. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 36. An organism that eats only meat. A) Herbivore. B) Carnivore. C) Producer. D) Omnivore. Show Answer Correct Answer: B) Carnivore. 37. Students are describing the ecosystem in an area. Which of these lists ALL the components the students should include in their description? A) All plant and animal species. B) All living and non-living factors. C) All weather patterns and climates. D) All elements and chemical substances. Show Answer Correct Answer: B) All living and non-living factors. 38. Cougars are predators that often eat weakened or diseased animals. this is a description of the ..... of cougars. A) Habitat. B) Community. C) Niche. D) None of these. Show Answer Correct Answer: C) Niche. 39. Which process do plants use to turn sunlight into food energy? A) Transpiration. B) Cellular respiration. C) Photosynthesis. D) Evaporation. Show Answer Correct Answer: C) Photosynthesis. 40. A baby song bird hatches from its egg with both parent songbirds watching. Which characteristic of life does this represent? A) All living things reproduce. B) All living things maintain homeostasis. C) All living things use energy. D) All living things grow. Show Answer Correct Answer: A) All living things reproduce. 41. Everything is connected in an ecosystem from what it ..... A) Cooks. B) Lives with. C) Eats. D) Talks to. Show Answer Correct Answer: C) Eats. 42. Which of the following ecosystems receives full sunlight 24 hours a day? A) Swamps. B) Marshes. C) Oceans. D) None of the above. Show Answer Correct Answer: B) Marshes. 43. True of False:The temperature of the ocean water decreases as the depth of the water increases. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 44. Which of the organisms below would be a producer? A) Algae. B) Mouse. C) Worm. D) None of the above. Show Answer Correct Answer: A) Algae. 45. What is a potential problem associated with underground mining? A) Water contamination. B) Mine subsidence. C) Air pollution. D) Noise pollution. Show Answer Correct Answer: B) Mine subsidence. 46. What term describes a single species within a habitat? A) Community. B) Ecosystem. C) Biome. D) Population. Show Answer Correct Answer: D) Population. 47. The dodder (Cuscuta europaea) is a species of plants that uses the stems of other plants as its carbon source. This plant would be considered a(n): A) Decomposer. B) Autotroph. C) Heterotroph. D) Producer. Show Answer Correct Answer: C) Heterotroph. 48. A prairie dog, a hawk, and a badger all are members of the same ..... A) Population. B) Species. C) Niche. D) Community. Show Answer Correct Answer: D) Community. 49. What is the importance of conservation in an ecosystem? A) Maintain balance and protect species diversity. B) Promote overpopulation and imbalance. C) Reduce biodiversity and species. D) Increase pollution and waste. Show Answer Correct Answer: A) Maintain balance and protect species diversity. 50. What makes an estuary different from other ecosystems? A) Life in an estuary is influenced by the rise and fall of the tides. B) Contains both seawater and freshwater. C) Organisms that live here have to adapt to the brackish water. D) All of the above. Show Answer Correct Answer: D) All of the above. 51. Define organisms and species. A) Plants and a group of organisms capable of interbreeding. B) Living things and a group of organisms capable of interbreeding. C) Inanimate objects and a group of organisms with similar characteristics. D) Non-living things and a group of organisms incapable of interbreeding. Show Answer Correct Answer: B) Living things and a group of organisms capable of interbreeding. 52. Which of these describes a mutualistic relationship? A) When one organism is harmed, but the other is benefitted. B) When one organism is unaffected, and the other is harmed. C) When one organism benefits, and the other is unaffected. D) When both organisms involved benefit. Show Answer Correct Answer: D) When both organisms involved benefit. 53. Contoh bentuk hubungan predatorisme adalah ..... A) Singa dengan harimau. B) Ular dengan tikus. C) Kambing dengan sapi. D) Ayam dengan kelinci. Show Answer Correct Answer: B) Ular dengan tikus. 54. Which reduces biodiversity? A) Protecting habitats. B) Habitat destruction, hunting, toxins. C) Increasing resources. D) Maintaining ecosystems. Show Answer Correct Answer: B) Habitat destruction, hunting, toxins. 55. Name This Relationship:Humans and Lice A) Parasitism. B) Predation. C) Competition. D) Commensalism. Show Answer Correct Answer: A) Parasitism. 56. A series of somewhat predictable events that occur in a community over time A) Ecological Community. B) Ecological Succession. C) Ecological imprint. D) Ecological Parasitism. Show Answer Correct Answer: B) Ecological Succession. 57. How much energy is transferred between trophic levels? A) 10%. B) 90%. C) 25%. D) 20%. Show Answer Correct Answer: A) 10%. 58. Organisms that can make their own food do so by the process of: A) Photosynthesis. B) Respiration. C) Scavenging. D) Decomposition. Show Answer Correct Answer: A) Photosynthesis. 59. There are 2 types of nutrition. The 2 types are ..... A) Autotrophic and homotrophic. B) Autotrophic and heterotrophic. C) Chemotrophic and sapotrophic. D) Heterotrophic and sapotrophic. Show Answer Correct Answer: B) Autotrophic and heterotrophic. 60. What happens to the carrying capacity if food or resources increase? A) The carrying capacity remains the same. B) The carrying capacity decreases. C) The carrying capacity fluctuates. D) The carrying capacity increases. Show Answer Correct Answer: D) The carrying capacity increases. ← 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 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 8 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books