This quiz works best with JavaScript enabled. Home > Cbse > Class 12 > Science > Biology > Class 12 Biology Chapter 14 Ecosystem – Quiz 20 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 14 Ecosystem Quiz 20 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Relationship between organisms in which one organism benefits at the expense of the other A) Symbolism. B) Commensalism. C) Parasitism. D) Mutualism. Show Answer Correct Answer: C) Parasitism. 2. True or false:hurricanes, tornadoes, floods, and fires are examples of secondary succession A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 3. Matter that is not used is called A) Waste. B) Garbage. C) Recyled. D) Water. Show Answer Correct Answer: A) Waste. 4. In a temperate forest, the trees are ..... A) Many different colors almost Fall-like. B) All one main color. C) Very sticky and humid. D) None of the above. Show Answer Correct Answer: A) Many different colors almost Fall-like. 5. ..... get there energy from eating other organisms. A) Herbivores. B) Carnivores. C) Consumers. D) Producers. Show Answer Correct Answer: C) Consumers. 6. Intraspecific competition is A) The same species competing for exactly the same resources. B) Different species competing for similar resources. C) The same species competing for similar resources. D) Different species competing for exactly the same resources. Show Answer Correct Answer: A) The same species competing for exactly the same resources. 7. Which group contains only heterotrophs? A) Rose bush, tree, moss. B) Photosynthetic bacteria. C) Fungi, elephant, snail. D) Grass, coral, algae. Show Answer Correct Answer: C) Fungi, elephant, snail. 8. True Or False:Biodiversity has man benefits A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 9. Parasitism, mutualism, and commensalism are examples of ..... A) Food chains. B) Trophic levels. C) Food webs. D) Symbiosis. Show Answer Correct Answer: D) Symbiosis. 10. Bird & Tree:A bird builds a nest in a hole in the trunk of the tree. It is protected from the rain and predators. The tree is not harmed or helped by the bird. A) Mutualism. B) Commensalism. C) Parasitism. D) None of the above. Show Answer Correct Answer: B) Commensalism. 11. Why are decomposers necessary in ecosystems? A) They recycle essential nutrients back down to producers. B) They enrich soil with nitrogen. C) They help keep ecosystems clean. D) All of the above. Show Answer Correct Answer: D) All of the above. 12. What is island geography? A) The study of the physical and human characteristics of mountains. B) The study of the physical and human characteristics of islands. C) The study of the physical and human characteristics of forests. D) The study of the physical and human characteristics of deserts. Show Answer Correct Answer: B) The study of the physical and human characteristics of islands. 13. Which of the following describes biodiversity A) The way that different animals migrate. B) The number of different species supported by an ecosystem. C) How animals interact with each other. D) None of the above. Show Answer Correct Answer: B) The number of different species supported by an ecosystem. 14. Succession that begins on newly formed rock or other areas that have no remnants of an older community is called A) Primary Succession. B) Primo Succession. C) Secondary Succession. D) No Succession. Show Answer Correct Answer: A) Primary Succession. 15. What is a key factor driving species towards extinction? A) Alien invasions. B) Natural disasters. C) Human-induced selection pressures. D) Meteor impacts. Show Answer Correct Answer: C) Human-induced selection pressures. 16. A change that disrupts the natural balance of an ecosystem A) Ecosystem services. B) Ecosystem disruption. C) Invasive species. D) None of the above. Show Answer Correct Answer: B) Ecosystem disruption. 17. Mushrooms are ..... A) Herbivores. B) Decomposers. C) Autotrophs. D) Scavengers. Show Answer Correct Answer: B) Decomposers. 18. Fill in the blank:Less energy is available to form new ..... as energy is lost at each trophic level. A) Levels. B) Biomass. C) Organisms. D) Energy. Show Answer Correct Answer: B) Biomass. 19. A community is the populations of all organisms from ..... species living in the ..... habitat whilst interacting with each other A) Same same. B) Different different. C) Different same. D) Same different. Show Answer Correct Answer: C) Different same. 20. Invasive species A) A non-native species that spreads quickly and harms ecosystems. B) A native species that is beneficial to its environment. C) A species that is extinct in its natural habitat. D) A species that is commonly found in multiple ecosystems. Show Answer Correct Answer: A) A non-native species that spreads quickly and harms ecosystems. 21. What type of environment are sclerophyll plants adapted to? A) Tropical climates with nutrient rich soils. B) Wetlands and estuaries. C) Harsh, dry climates and nutrient-deficient soils. D) Mangrove swamps. Show Answer Correct Answer: C) Harsh, dry climates and nutrient-deficient soils. 22. An animal that hunts other animals for food is a ..... A) Predator. B) Omnivore. C) Herbivore. D) Prey. Show Answer Correct Answer: A) Predator. 23. How does water transfer when it evaporates from the ocean? A) From the hydrosphere to the atmosphere. B) From the biosphere to the hydrosphere. C) Completely within the hydrosphere. D) From the hydrosphere to the geosphere. Show Answer Correct Answer: A) From the hydrosphere to the atmosphere. 24. Long cyndrical2. many nucleus are located on the edge3. work under conciousness (voluntary)the characteristics above is describing ..... muscle cell A) Skeletal. B) Cardiac. C) Skeletal dan cardiac. D) Smooth. Show Answer Correct Answer: A) Skeletal. 25. Biology Ecosystems A) An increase in plant biodiversity. B) The introduction of a new predator species. C) The migration of herbivores to another region. D) A decrease in sunlight availability. Show Answer Correct Answer: B) The introduction of a new predator species. 26. A place in which an organism lives. A) Community. B) Habitat. C) Ecosystem. D) Population. Show Answer Correct Answer: B) Habitat. 27. Study of the relationships between the populations in a community and their environment. A) Abiotic. B) Ecosystem. C) Biology. D) Ecology. Show Answer Correct Answer: D) Ecology. 28. A medium sized ecosystem such as a lake or forest A) Micro ecosystem. B) Messo ecosystem. C) Biome. D) None of the above. Show Answer Correct Answer: B) Messo ecosystem. 29. An ecosystem is a few communities that live together in a habitat and interact with each other ( ..... components) but also non-living ..... components such as water, air and soil to create a balanced system A) Biotic homobiotic. B) Probiotic conbiotic. C) Biotic abiotic. D) Abiotic biotic. Show Answer Correct Answer: C) Biotic abiotic. 30. The approximate amount of energy that is transferred between each trophic level is: A) 10%. B) 0.1%. C) 90%. D) It totally depends on the ecosystem. Show Answer Correct Answer: A) 10%. 31. Ecological Restoration A) Introducing non-native species to enhance biodiversity. B) Helping damaged ecosystems recover to their natural state. C) Creating new ecosystems from scratch. D) Preserving existing ecosystems without any changes. Show Answer Correct Answer: B) Helping damaged ecosystems recover to their natural state. 32. Logistic growth is: A) Unlimited. B) Levels off due to limiting factors. C) Instant decline. D) Only small populations. Show Answer Correct Answer: B) Levels off due to limiting factors. 33. What are consumers that eat both plants and animals A) Herbivores. B) Carnivores. C) Omnivores. D) None of the above. Show Answer Correct Answer: C) Omnivores. 34. Which of the following are all abiotic? A) Water, Fish, Insects, Lily Plants. B) Dogs, Meat, Cats, Catnip. C) Lion, Pride Rock, Warthog, Meerkat. D) Temperature, Light, Rain, Gravity, Heat. Show Answer Correct Answer: D) Temperature, Light, Rain, Gravity, Heat. 35. A carnivore is referred to as a ..... consumer. A) Producer. B) Primary. C) Secondary. D) None of the above. Show Answer Correct Answer: C) Secondary. 36. What does the plant use as well as water in photosynthesis? A) Sugar. B) Carbon dioxide. C) Nitrogen. D) Oxygen. Show Answer Correct Answer: B) Carbon dioxide. 37. Before plants can reuse many organic materials, the materials must be broken down by ..... A) Viruses. B) Decomposers. C) Scavengers. D) Parasites. Show Answer Correct Answer: B) Decomposers. 38. Ideal percentage of forests on Earth is A) 0.33. B) 0.23. C) 0.13. D) 0.45. Show Answer Correct Answer: A) 0.33. 39. A relationship where both organisms benefit is called ..... A) Mutualism. B) Commensalism. C) Parasitism. D) None of the above. Show Answer Correct Answer: A) Mutualism. 40. The difference between saprotrophs and detritovores is A) Saprotrophs digest externally and detritovores digest internally. B) Saprotrophs digest internally and detritovores digest externally. C) Saprotrophs are autotrophs and detritovores are decomposers. D) Saprotrophs are decomposers and detritovores are autrotrophs. Show Answer Correct Answer: A) Saprotrophs digest externally and detritovores digest internally. 41. Is abundant, but most organisms can't use it. Only certain types of bacteria can convert it into ammonia through a process called nitrogen fixation A) Nitrogen gas. B) Oxygen gas. C) Sulfur. D) None of the above. Show Answer Correct Answer: A) Nitrogen gas. 42. In a food chain, the plant is called a: A) Herbivore. B) Consumer. C) Carnivore. D) Producer. Show Answer Correct Answer: D) Producer. 43. Which of the following can NOT be recycled in an ecosystem? A) Minerals. B) Nutrients. C) Water. D) Energy. Show Answer Correct Answer: D) Energy. 44. Which of the following is NOT a level of organization in ecosystems? A) Ecosystem. B) Species. C) Community. D) Population. Show Answer Correct Answer: B) Species. 45. Which extinction event is considered the most severe in the history of life on Earth? A) Cretaceous-Tertiary Extinction. B) Holocene Extinction. C) Permian-Triassic Extinction. D) Ordovician-Silurian Extinction. Show Answer Correct Answer: C) Permian-Triassic Extinction. 46. Thomas constructs a model by completing the following steps.1) Draw a diagram that shows where oxygen is found on Earth, including the atmosphere, bodies of water, land and living things.2) Draw arrows to show how oxygen moves and changes from one location to another.3) Label each arrow.What type of ecological model has Thomas constructed? A) Food web. B) Energy pyramid. C) Biogeochemical cycle. D) Geological system. Show Answer Correct Answer: C) Biogeochemical cycle. 47. Which of the following leads to a decrease in biodiversity? A) Introduction of exotic or invasive species. B) Selective cutting. C) Protection of ecosystems. D) Pollution control. Show Answer Correct Answer: A) Introduction of exotic or invasive species. 48. Something that is from that area A) Native. B) Alien. C) Invasive. D) Non native. Show Answer Correct Answer: A) Native. 49. Which trophic level makes its own food? A) Carnivore. B) Animals. C) Producer. D) Herbivore. Show Answer Correct Answer: C) Producer. 50. The total of all genetically based variation in all organisms in the biosphere is called A) Differentation. B) Biodiversity. C) Diversity. D) Superdiversity. Show Answer Correct Answer: B) Biodiversity. 51. A ..... is a closed container of plants and other living things that shows you how an ecosystem works. A) Terrarium. B) Park. C) Fish Bowl. D) Ecosystem. Show Answer Correct Answer: A) Terrarium. 52. Animals use oxygen in the process of ..... and make more CO2. A) Photosynthesis. B) Cellular respiration. C) All the above. D) None of the above. Show Answer Correct Answer: B) Cellular respiration. 53. What is the Viola Woodlawn project an example of? A) Mine reclamation. B) A new mining technique. C) A mining legislation. D) A failed mining operation. Show Answer Correct Answer: A) Mine reclamation. 54. Biodiversity provides: A) Fewer species. B) Food, medicines, industrial products. C) Prevents change. D) Limits growth. Show Answer Correct Answer: B) Food, medicines, industrial products. 55. An organism that eats the secondary consumer. A) Primary Consumer. B) Consumer. C) Tertiary Consumer. D) Secondary Consumer. Show Answer Correct Answer: C) Tertiary Consumer. 56. The basic unit of structure and function in a living things. A) Nucleus. B) Chloroplast. C) Cell. D) Cell membrane. Show Answer Correct Answer: C) Cell. 57. Individuals with more beneficial traits will ..... A) Survive. B) Not survive. C) Neither. D) Both. Show Answer Correct Answer: A) Survive. 58. The following statement is a hypothesis formed about marsh grass:If the amount of nitrogen marsh grass receives is increased, then the height of the grass will increase, because nitrogen is an essential nutrient needed for marsh grass to grow.What is the independent variable of the statement above? A) Height of grass. B) Amount of nitrogen. C) Essential nutrient. D) Amount of growth. Show Answer Correct Answer: B) Amount of nitrogen. 59. ..... are where plants and animals live together in their environment. A) Swamps. B) Ecosystems. C) Geosphere. D) America. Show Answer Correct Answer: B) Ecosystems. 60. Euglena is a unicellular organism that feeds on bacteria and uses CO$_{2}$ as a carbon source. Which described the nutrition of this organism? A) Autotrophic only. B) Heterotrophic only. C) Saprotrophic only. D) Autotrophic and heterotrophic. Show Answer Correct Answer: D) Autotrophic and heterotrophic. ← 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