This quiz works best with JavaScript enabled. Home > Cbse > Class 12 > Science > Biology > Class 12 Biology Chapter 14 Ecosystem – Quiz 19 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 14 Ecosystem Quiz 19 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Fourth level of Organization A) Organs. B) Organ System. C) Tissues. D) Cells. E) Organism. Show Answer Correct Answer: B) Organ System. 2. What type of species plays a vital and unique role in maintaining structure, stability, and diversity in an ecosystem? A) Pioneer species. B) Indicator species. C) Keystone species. D) None of the above. Show Answer Correct Answer: C) Keystone species. 3. What are omnivores and provide an example? A) Omnivores-Example:Elephants. B) Omnivores-Example:Lions. C) Omnivores-Example:Bears. D) Omnivores-Example:Snakes. Show Answer Correct Answer: C) Omnivores-Example:Bears. 4. Nonvascular plants usually grow in: A) Deserts. B) Sunny fields. C) Damp, shady areas. D) Arctic regions. Show Answer Correct Answer: C) Damp, shady areas. 5. A pond ecosystem includes a number of different types of birds, mammals, reptiles, and fish. All of these different groups make up the ecosystem's A) Microorganisms. B) Community. C) Populations. D) Abiotic factors. Show Answer Correct Answer: B) Community. 6. A relationship between a mosquito and a human is called ..... and it means that ..... : A) Parasitism-one gains and one is harmed. B) Predation-one gets eaten and one benefits. C) Competition-one species gains over another. D) Mutualism-both gain. E) Commensalism-one gains, one is not affected. Show Answer Correct Answer: A) Parasitism-one gains and one is harmed. 7. Density-independent A) A factor that only affects large populations. B) A factor that increases with population density. C) A limiting factor that decreases as population size increases. D) A limiting factor that affects a population no matter its size (ex:natural disasters). Show Answer Correct Answer: D) A limiting factor that affects a population no matter its size (ex:natural disasters). 8. Thomas is describing an example of secondary succession. Which of the following events is most useful for him to include? A) Lichens begin growing on rocks that formed from a volcanic eruption. B) Many fishes die in a pond when oxygen levels decrease. C) The populations of wolves and rabbits change in a cyclical pattern. D) Small plants and animals return to the land after a forest fire. Show Answer Correct Answer: D) Small plants and animals return to the land after a forest fire. 9. Example of a decomposer A) Fungus. B) Plants. C) Frogs. D) Mouse. Show Answer Correct Answer: A) Fungus. 10. A relationship between different species. A) Parasitism. B) Mutualism. C) Commensalism. D) Symbiosis. Show Answer Correct Answer: D) Symbiosis. 11. What amount of percentage does the energy decrease as it goes up the pyramid? A) 10%. B) 100%. C) 1000%. D) 1%. Show Answer Correct Answer: A) 10%. 12. Wetlands have high species diversity. A) False. B) True. C) All the above. D) None of the above. Show Answer Correct Answer: B) True. 13. Which of the following processes releases carbon dioxide into the atmosphere? A) Photosynthesis. B) Condensation. C) Transpiration. D) Respiration. Show Answer Correct Answer: D) Respiration. 14. Nitrogen is converted to ..... in the soil by certain microorganisms. A) Gas. B) Urea. C) Nitrates. D) Ammonia. Show Answer Correct Answer: C) Nitrates. 15. What is the primary learning intention of the video? A) To understand the music in ecosystems. B) To learn about the history of ecosystems. C) To investigate changes in past ecosystems to manage future ones. D) To memorize the names of different ecosystems. Show Answer Correct Answer: C) To investigate changes in past ecosystems to manage future ones. 16. Difference between primary and secondary succession? A) Primary begins without soil. B) Primary occurs only after fires. C) Primary has soil. D) Secondary occurs only in oceans. Show Answer Correct Answer: A) Primary begins without soil. 17. A large community of organisms in a certain area is A) An ecosystem. B) A trophic level. C) Consumers. D) A family. Show Answer Correct Answer: A) An ecosystem. 18. Which of the following organisms obtain energy from the sun to provide energy to other organisms in the food chain?Antara organisma berikut, yang manakah mendapat tenaga daripada matahari untuk membekalkan makanan kepada organisma yang lain dalam rantai makanan> A) Producerpengeluar. B) Decomposerpengurai. C) Carnivorekarnivor. D) Herbivoreherbivor. Show Answer Correct Answer: A) Producerpengeluar. 19. To change behaviors to help one to survive A) Habitat. B) Adapted. C) Ecosystem services. D) Climate. Show Answer Correct Answer: B) Adapted. 20. Which property distinguishes pioneer species from those that arrive later in ecological succession? A) Ability to grow on hard, barren rock. B) Defenses against herbivory. C) Ability to grow very quickly. D) Ability to grow in loose, wet soil. Show Answer Correct Answer: A) Ability to grow on hard, barren rock. 21. Temp, oxygen, and water are ..... factors. A) Abiotic. B) Biotic. C) All the above. D) None of the above. Show Answer Correct Answer: A) Abiotic. 22. What does the plant produce in photosynthesis as well as sugar? A) Oxygen. B) Carbon dioxide. C) Nitrogen. D) Water. Show Answer Correct Answer: A) Oxygen. 23. A group of living things that interact in an ecosystem is called a: A) Community. B) Ecosystem. C) Living. D) Population. Show Answer Correct Answer: A) Community. 24. What are the top predators in a food chain? A) Grasshoppers. B) Bears and orcas. C) Wolves. D) Snakes. Show Answer Correct Answer: B) Bears and orcas. 25. True or False:Temperature does NOT affect the animals that live in marine ecosystems. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 26. What has been a significant human impact on ecosystems? A) Increased biodiversity. B) Decrease in global temperatures. C) Reduction in land clearing. D) Introduction of diseases. Show Answer Correct Answer: D) Introduction of diseases. 27. What legislation regulates the mining sector in New South Wales? A) The Mining Act and the Clear Air Act. B) The Environmental Protection Act. C) The Land Reclamation Act. D) The Water Management Act. Show Answer Correct Answer: A) The Mining Act and the Clear Air Act. 28. Which of the following organisms are most at risk for the bio magnification of Mercury? A) Zooplankton that eat the phytoplankton. B) Large fish that eat the minnows. C) Minnows that eat the zooplankton. D) Phytoplankton. Show Answer Correct Answer: B) Large fish that eat the minnows. 29. An individual who eats only plants is called a(n) A) Omnivore. B) Decomposer. C) Carnivore. D) Herbivore. Show Answer Correct Answer: D) Herbivore. 30. What term is used to describe all the organisms of different species living in one habitat? A) Ecosystem. B) Population. C) Community. D) Habitat. Show Answer Correct Answer: C) Community. 31. Rabbits are members of a community in a meadow. The rabbits eat grasses, clover, as well as roots, seeds, and tree bark. What describes the organisms that share the same trophic level as the rabbits? A) Snakes, hawks, and other animals that eat rabbits. B) Community members that interact with rabbits. C) Meadow animals that are about the same size as a rabbit. D) Meadow animals that eat plants and plant products. Show Answer Correct Answer: D) Meadow animals that eat plants and plant products. 32. Which statement describes all primary producers? A) All harness the energy of sunlight through the process of photosynthesis. B) All take in energy to assemble energy-rich compounds. C) All are small, single-celled organisms, such as bacteria and algae. D) All take in food and break it apart to release energy. Show Answer Correct Answer: B) All take in energy to assemble energy-rich compounds. 33. Discuss the role of keystone species in maintaining ecosystem balance. A) Keystone species are not important for preserving biodiversity. B) Keystone species only benefit a few select species in the ecosystem. C) Keystone species help maintain ecosystem balance by regulating the population of other species and preserving biodiversity. D) Keystone species have no impact on ecosystem balance. Show Answer Correct Answer: C) Keystone species help maintain ecosystem balance by regulating the population of other species and preserving biodiversity. 34. An example of a prey is A) Decomposer. B) 1st level consumer. C) Producer. D) Top of the food chain. Show Answer Correct Answer: B) 1st level consumer. 35. Biodiversity is best described as the ..... A) All of the living organisms in an area. B) The place where an animal lives. C) Total variety of all living things on Earth. D) Number of organisms in an area. Show Answer Correct Answer: C) Total variety of all living things on Earth. 36. In the food chain below, which is the producer?grass $\rightarrow$ mouse $\rightarrow$ snake $\rightarrow$ hawk A) Snake. B) Mouse. C) Grass. D) Hawk. Show Answer Correct Answer: C) Grass. 37. What kind of Ecosystem is known as sustainable? A) The one in which all species are in balance. B) The one in which there are no animals. C) The one in which animals feed on each other. D) None of the above. Show Answer Correct Answer: A) The one in which all species are in balance. 38. Humans caused extinctions by hunting; CITES helps by: A) Farming. B) Energy loss. C) Migration. D) Banning trade in endangered species. Show Answer Correct Answer: D) Banning trade in endangered species. 39. Explain the effects of pollution on ecosystems. A) Pollution only affects human health, not ecosystems. B) Ecosystems thrive in polluted environments. C) Pollution disrupts ecosystems by harming species, degrading habitats, and altering natural processes. D) Pollution has no impact on ecosystems. Show Answer Correct Answer: C) Pollution disrupts ecosystems by harming species, degrading habitats, and altering natural processes. 40. When an environment has reached its carrying capacity for a certain population, which of the following is true? A) Growth and immigration rate is equal to death and emigration rate. B) Growth and immigration rate is greater than death and emigration rate. C) Growth and immigration rate is less than death and emigration rate. D) Growth rate is exponential. Show Answer Correct Answer: A) Growth and immigration rate is equal to death and emigration rate. 41. Breaks down and feeds on the remains of other organisms A) Decomposer. B) Consumer. C) Producer. D) None of the above. Show Answer Correct Answer: A) Decomposer. 42. The area between an organism's upper limit and lower limit. A) Upper Limit. B) Invasive Species. C) Lower Limit. D) Range of Tolerance. Show Answer Correct Answer: D) Range of Tolerance. 43. Grasshoppers are A) Carnivores. B) Decomposers. C) Scavengers. D) Herbivores. Show Answer Correct Answer: D) Herbivores. 44. Relationship between organism in which one organism benefits and the other is neither harmed or benefited A) Commensalism. B) Mutualism. C) Symbolism. D) Parasitism. Show Answer Correct Answer: A) Commensalism. 45. An example of a predator is A) First Level Consumer. B) Herbivore. C) Producer. D) 3rd Level Consumer. Show Answer Correct Answer: D) 3rd Level Consumer. 46. A living thing similar to a plant that is usually found growing in water. They produce their own food through photosynthesis like plants do, but algae have no leaves, stems or roots A) Rock. B) Palm Tree. C) Rainforest. D) Algae. Show Answer Correct Answer: D) Algae. 47. Biotic components refer to all organisms (living things) in an ecosystem which interact with other organisms. Abiotic components are all the non-living elements including their physical and chemical characteristics that can affect an organism in an ecosystem. A) TRUE. B) FALSE. C) All the above. D) None of the above. Show Answer Correct Answer: A) TRUE. 48. What is the term for the total mass of organisms in a given area or volume? A) Pyramid of biomass. B) Trophic level. C) Biomass. D) Energy flow. Show Answer Correct Answer: C) Biomass. 49. The products of photosynthesis are the reactants of cellular respiration. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 50. What is the difference between a fundamental niche and a realized niche? A) Realized niche is the actual niche occupied considering limiting factors. B) Fundamental niche includes interactions with predators, realized does not. C) There is no significant difference. D) Fundamental niche is smaller than the realized niche. Show Answer Correct Answer: A) Realized niche is the actual niche occupied considering limiting factors. 51. Rocks, water, air, sun, and soil are ..... A) Biotic. B) Abiotic. C) All the above. D) None of the above. Show Answer Correct Answer: B) Abiotic. 52. What type of waste management is part of the Viola Woodlawn project? A) Incineration. B) Sanitary landfill and bioenergy generation. C) Recycling. D) Composting. Show Answer Correct Answer: B) Sanitary landfill and bioenergy generation. 53. Manufactures food using energy from the sun or from chemical compounds A) Decomposer. B) Scavenger. C) Autotroph. D) Heterotroph. Show Answer Correct Answer: C) Autotroph. 54. What will happen if two species occupy the same niche in an ecosystem? A) The ecosystem will be stressed and could collapse. B) One species will either alter their niche or be eliminated. C) The niche will expand to accommodate both species. D) The species will share the niche. Show Answer Correct Answer: B) One species will either alter their niche or be eliminated. 55. Which of the following Kingdoms are ONLY heterotrophic? A) Bacteria and Protista. B) Protista and Fungi. C) Fungi and Bacteria. D) Animalia and Fungi. Show Answer Correct Answer: D) Animalia and Fungi. 56. Which type of ecological succession begins on bare rock (no soil)? A) Primary. B) Secondary. C) Both. D) None of the above. Show Answer Correct Answer: A) Primary. 57. Organisms that breaks down and absorbs nutrients from dead organisms A) Trophic level. B) Decomposer. C) Species. D) Consumer. Show Answer Correct Answer: B) Decomposer. 58. In an ecosystem, you would expect to find interspecific competition between A) Males and females of a species in which both sexes occupy the same niche. B) Two wasp species that mimic each other's appearance. C) Populations of two species that occupy the same niche. D) A prey species and its predator. Show Answer Correct Answer: C) Populations of two species that occupy the same niche. 59. Which sampling technique is used for sampling plants? A) Pitfall trap. B) Sweep net. C) Tullgren funnel. D) Quadrat. Show Answer Correct Answer: D) Quadrat. 60. All of the nonliving parts of an ecosystem are ..... A) Biotic. B) Abiotic. C) Biography. D) Biology. Show Answer Correct Answer: B) Abiotic. ← 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