This quiz works best with JavaScript enabled. Home > Cbse > Class 12 > Science > Biology > Class 12 Biology Chapter 14 Ecosystem – Quiz 18 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 14 Ecosystem Quiz 18 (60 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) Ecosystem. B) Microscope. C) Zoo. D) Species. Show Answer Correct Answer: A) Ecosystem. 3. What are primary consumers? A) Carnivores. B) Producers. C) Herbivores. D) Omnivores. Show Answer Correct Answer: C) Herbivores. 4. Which organism can make its own food using the sun's energy? A) Decomposer. B) Producer. C) Consumer. D) Scavenger. Show Answer Correct Answer: B) Producer. 5. What is the term used for the first organisms to colonize an area affected by a volcanic eruption? A) Intermediate species. B) Keystone species. C) Climax community. D) Pioneer species. Show Answer Correct Answer: D) Pioneer species. 6. 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. 7. 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) Habitat. C) Population. D) Ecological niche. Show Answer Correct Answer: D) Ecological niche. 8. 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. 9. 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. 10. What is a key feature of kangaroos that allows them to survive on poor quality grasses? A) Sequential eruption of their teeth. B) Ability to fly short distances. C) Camouflage in the Australian bush. D) Breathing underwater. Show Answer Correct Answer: A) Sequential eruption of their teeth. 11. 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. 12. The food web starts from A) Plants. B) Fungi. C) Bacteria. D) Animals. Show Answer Correct Answer: A) Plants. 13. What form of energy is in the food organisms consume? A) Chemical energy. B) Mechanical energy. C) Thermal energy. D) Radiant energy. Show Answer Correct Answer: A) Chemical energy. 14. Carbon and other nutrients becomes usable to other organisms by A) Transpiration from trees. B) Combustion of fossil fuels. C) Evaporation of water. D) Decomposition of dead organisms. Show Answer Correct Answer: D) Decomposition of dead organisms. 15. (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. 16. Salt Concentration A) Biotic. B) Abiotic. C) All the above. D) None of the above. Show Answer Correct Answer: B) Abiotic. 17. Which of the following describes an interconnection of food chains in an ecosystem? A) Food chain. B) Energy pyramid. C) Food web. D) Producer web. Show Answer Correct Answer: C) Food web. 18. 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. 19. A(n) ..... shows interconnected food chains. A) Feeding diagram. B) Tropic level. C) Food web. D) Energy pyramid. Show Answer Correct Answer: C) Food web. 20. An environmental factor such as predation, disease, and competition that depends on the number of members in a population per unit A) Population growth rate. B) Density-independent factor. C) Density-dependent factor. D) Dispersion. Show Answer Correct Answer: C) Density-dependent factor. 21. 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. 22. 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) Parasitism. C) Commensalism. D) Amensalism. Show Answer Correct Answer: C) Commensalism. 23. As water moves through the water cycle, it changes state and location. A scientist measures the movement of water through the water cycle. Where is this scientist most likely to find water molecules that have not changed state or location for hundreds of years or more? A) Ocean. B) River. C) Glacial ice. D) Rain clouds. Show Answer Correct Answer: C) Glacial ice. 24. Shrimp are know to consume other dead shrimp, clams, worms, and decaying plant matter. Which of the following would be used to describe shrimp in this role in an ecosystem? A) Primary consumer. B) Detritivore. C) Saprotroph. D) Carnivore. Show Answer Correct Answer: B) Detritivore. 25. What shows the flow of energy in an ecosystem? A) A diagram. B) A flow chart. C) A graph. D) A food chain. Show Answer Correct Answer: D) A food chain. 26. What does the upward trajectory in temperature anomalies indicate? A) A return to Ice House conditions. B) A decrease in global warming. C) A concern due to the short timeframe. D) Stability in climate patterns. Show Answer Correct Answer: C) A concern due to the short timeframe. 27. Why are plants considered as producers? A) Plants convert energy from the sun into chemical energy in the form of glucose (food). B) Plants produce root crops that supply carbohydrates to animals. C) Plants provide vegetable for animals and human consumption. D) Plants produce fruits that can be eaten by animals. Show Answer Correct Answer: A) Plants convert energy from the sun into chemical energy in the form of glucose (food). 28. Which of the following best describes a community? A) Sharks, groupers, anemones and shrimp on a coral reef. B) Decorator crabs on the seafloor. C) Loggerhead sea turtles in Atlantic. D) Prairie grassland in Wyoming. Show Answer Correct Answer: A) Sharks, groupers, anemones and shrimp on a coral reef. 29. Third level of Organization A) Organ System. B) Organs. C) Organism. D) Tissues. E) Cells. Show Answer Correct Answer: B) Organs. 30. An animal called a divo lives on an island. This island is the perfect ecosystem for the divo because it has its only food, tree ants. One winter it got very cold and all the tree ants died. What will happen to the divos? A) Their fur grew longer and thicker. B) They dug holes and lived underground. C) They died. D) They switched to eating seeds. Show Answer Correct Answer: C) They died. 31. A consumer that eats both plants and animals is a ..... A) Producer. B) Herbivore. C) Omnivore. D) Carnivore. Show Answer Correct Answer: C) Omnivore. 32. The word formula for Photosynthesis is: A) Carbon dioxide + water $\rightarrow$ oxygen + glucose + water. B) Oxygen + water $\rightarrow$ carbon dioxide + glucose. C) Carbon dioxide + water $\rightarrow$ energy. D) None of the above. Show Answer Correct Answer: A) Carbon dioxide + water $\rightarrow$ oxygen + glucose + water. 33. The energy needed for photosynthesis comes from A) The heat of the sun. B) Water. C) Glucose. D) The light of the sun. Show Answer Correct Answer: D) The light of the sun. 34. Biotic factors include ..... A) Living things like animals, fungi, and plants. B) Landfills. C) Nonliving things like soil, rocks, and water. D) Both living and nonliving things. Show Answer Correct Answer: A) Living things like animals, fungi, and plants. 35. A local community group the cleans up the Don Valley is called A) Clean up Crew. B) The Rabbits. C) Don't Mess with the Don. D) Humans cleaning the Don. Show Answer Correct Answer: C) Don't Mess with the Don. 36. How do human activities impact biogeochemical cycles? A) Human activities impact biogeochemical cycles by altering the natural flow of elements and nutrients through the atmosphere, hydrosphere, and lithosphere. B) Human activities only have a positive impact on biogeochemical cycles. C) Biogeochemical cycles are not affected by human activities. D) Human activities have no impact on biogeochemical cycles. Show Answer Correct Answer: A) Human activities impact biogeochemical cycles by altering the natural flow of elements and nutrients through the atmosphere, hydrosphere, and lithosphere. 37. What are the two main types of freshwater wetlands? A) Lakes and ponds. B) Rivers and streams. C) Littoral zones and benthic zones. D) Marshes and swamps. Show Answer Correct Answer: D) Marshes and swamps. 38. Dalam suatu ekosistem danau, zooplankton berperan sebagai ..... A) Produsen. B) Konsumen tingkat II. C) Pengurai. D) Konsumen tingkat I. Show Answer Correct Answer: D) Konsumen tingkat I. 39. What is the goal of taxonomy? A) To explain the differences between living organisms. B) To classify living organisms into groups. C) To predict the types of undiscovered organisms. D) To establish relationships of organisms and their habitats. Show Answer Correct Answer: B) To classify living organisms into groups. 40. Which is the best definition of an ecosystem? A) All the organisms in an area interacting together. B) All the abiotic factors. C) All the biotic factors. D) All of the animals. Show Answer Correct Answer: A) All the organisms in an area interacting together. 41. Earthworms exhibit a tube-within-a-tube body plan with a digestive system that runs the entire length of its body. Earthworms get their energy by: A) Consuming living organisms. B) Converting energy in their surroundings in chemical energy. C) Internally digesting deceased organisms. D) Externally digesting deceased organisms. Show Answer Correct Answer: C) Internally digesting deceased organisms. 42. All organisms fall into two categories which are: A) Photosynthesis and cellular respiration. B) Autotroph and heterotroph. C) Biotic and abiotic. D) None of the above. Show Answer Correct Answer: B) Autotroph and heterotroph. 43. Which of the following are abiotic factors that shape ecosystems? A) Worms, plants and temperature. B) Wind, precipitation, and soil type. C) Niches, trees, and bacteria. D) Sunlight, mushrooms, and wind. Show Answer Correct Answer: B) Wind, precipitation, and soil type. 44. What is the study about ecosytem?? A) Environmental Science. B) Ecology. C) Botany. D) Biology. Show Answer Correct Answer: B) Ecology. 45. When small plants such as grasses and lichens colonize bare rock it is called: A) Primary Succession. B) Climax Community. C) Secondary Succession. D) Pioneer Species. Show Answer Correct Answer: A) Primary Succession. 46. Where does the food chain START? A) With consumers that eat grass. B) With the sun giving energy to producers. C) With consumers eating other consumers. D) With the sun giving energy to consumers. Show Answer Correct Answer: B) With the sun giving energy to producers. 47. What can climate act as in the process of microevolution? A) An irrelevant factor. B) A decreasing agent. C) A selecting agent. D) A stabilizing factor. Show Answer Correct Answer: C) A selecting agent. 48. Most evaporation occurs from A) Oceans. B) Rivers. C) Trees. D) Glaciers. Show Answer Correct Answer: A) Oceans. 49. Which statement defines community? A) The place where an organism lives. B) A group of one type of species in an area. C) All organisms in an ecosystem. D) Total variety of living organisms on the planet. Show Answer Correct Answer: C) All organisms in an ecosystem. 50. A declining population is: A) Invasive. B) Stable. C) Endemic. D) Endangered. Show Answer Correct Answer: D) Endangered. 51. A population of baboons has access to plenty of food, shelter, and space to live but has an inadequate supply of water. Which of these BEST defines the water in this case? A) Limiting factor. B) Limiting reagent. C) Darwinian shortfall. D) Biochemical constraint. Show Answer Correct Answer: A) Limiting factor. 52. What two factors are attributed to population decline? A) Emigration & Immigration. B) Increase Death rate & increase Emigration rate. C) Immigration & increase Birth rate. D) Increase Birth rate & increase Death rate. Show Answer Correct Answer: B) Increase Death rate & increase Emigration rate. 53. Each level in a food chain is called as ..... A) Food web. B) Trophic level. C) Energy level. D) Interdependence. Show Answer Correct Answer: B) Trophic level. 54. It is the interconnection of food chains and represents of what eats what in an ecological community. A) Food chain. B) Food transfer. C) Food web. D) Food pyramid. Show Answer Correct Answer: C) Food web. 55. An organism that kills and eats another for food A) Prey. B) Predator. C) Plant. D) Parasite. Show Answer Correct Answer: B) Predator. 56. The pyramid of ..... always decreases in size as you move up the trophic levels. A) Energy. B) Biomass. C) Mummies. D) Numbers. Show Answer Correct Answer: A) Energy. 57. What is the relationship between corals and zooxanthellae described as? A) Mutualistic. B) Parasitic. C) Commensal. D) Competitive. Show Answer Correct Answer: A) Mutualistic. 58. Which choice shows the correct order of the levels of environmental organization? A) Organism, community, population, ecosystem, biosphere, biome. B) Organism, population, biome, ecosystem, biosphere, community. C) Organism, population, community, ecosystem, biome, biosphere. D) Population, biome, ecosystem, biosphere, organism, community. Show Answer Correct Answer: C) Organism, population, community, ecosystem, biome, biosphere. 59. This organelle is in both plants and animals. It controls what goes in and out of a cell. A) Cell wall. B) Cell membrane. C) Cell organelles. D) Mitochondria. Show Answer Correct Answer: B) Cell membrane. 60. Which organism breaks down dead plants and animals? A) Predator. B) Producer. C) Decomposer. D) Consumer. Show Answer Correct Answer: C) Decomposer. ← 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