This quiz works best with JavaScript enabled. Home > Cbse > Class 12 > Science > Biology > Class 12 Biology Chapter 14 Ecosystem – Quiz 5 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 14 Ecosystem Quiz 5 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What will happen if all of the frogs in a population die? A) The frogs' predators will decrease and the frogs' prey will increase. B) The frogs' predators will increase and the frogs' prey will decrease. C) We better all pray because there isn't anymore frogs. D) None of the above. Show Answer Correct Answer: A) The frogs' predators will decrease and the frogs' prey will increase. 2. When death rate is equal to birth rate ..... A) Population stays the same. B) Population decreases. C) Population rapidly increases then becomes stable. D) Population increases. Show Answer Correct Answer: A) Population stays the same. 3. The usual weather in a place is called: A) Ecosystem. B) Niche. C) Weather. D) Climate. Show Answer Correct Answer: D) Climate. 4. How does solar irradiance affect the abundance of life on Earth? A) It creates wind. B) It provides heat. C) It supports photosynthesis. D) It causes erosion. Show Answer Correct Answer: C) It supports photosynthesis. 5. What additional human activities exacerbate the impact of climate change on biodiversity? A) Land clearing and deforestation. B) Increased use of renewable resources. C) Reduction in fossil fuel consumption. D) Expansion of natural habitats. Show Answer Correct Answer: A) Land clearing and deforestation. 6. What does 'sclerophyll' literally mean? A) Green leaf. B) Hard leaf. C) Dry leaf. D) Soft leaf. Show Answer Correct Answer: B) Hard leaf. 7. Which of the following describes an antibody? A) A medicine used to treat bacterial infections. B) A molecule that specifically marks pathogens for death. C) A molecule that kills any pathogen it comes into contact with. D) A pathogen that is created by viruses. Show Answer Correct Answer: B) A molecule that specifically marks pathogens for death. 8. We expect that a keystone species that is a predator will A) Harvest prey species down to extinction. B) Help many of its prey reproduce. C) Reduce the diversity of the community. D) Maintain the species diversity in a community. Show Answer Correct Answer: D) Maintain the species diversity in a community. 9. Community of organisms and the abiotic factors in their environment. A) Heat. B) Herbivore. C) Geosphere. D) Ecosystem. Show Answer Correct Answer: D) Ecosystem. 10. A/an ..... consists of all the biotic and abiotic factors in an area and their interactions. A) Population. B) Niche. C) Ecosystem. D) Habitat. Show Answer Correct Answer: C) Ecosystem. 11. Density-independent factor example: A) Predation. B) Hurricane. C) Competition. D) Parasites. Show Answer Correct Answer: B) Hurricane. 12. Ecosystems need constant inputs of ..... A) Organisms. B) Energy. C) Matter. D) Water. Show Answer Correct Answer: B) Energy. 13. Maggots feed on dead and decaying organisms for energy. What are maggots? A) Decomposers. B) Heterotrophs. C) Autotrophs. D) Producers. Show Answer Correct Answer: A) Decomposers. 14. When one species benefits and the other is not harmed A) Mutualism. B) Commensalism. C) Parasitism. D) Adaptations. Show Answer Correct Answer: B) Commensalism. 15. A species that is nonnative to an area, no natural predators, and a high capacity to reproduce. A) Lower Limit. B) Range of Tolerance. C) Invasive Species. D) Upper Limit. Show Answer Correct Answer: C) Invasive Species. 16. The deepest parts of the benthic zone do not get any ..... A) Fish. B) Sunlight. C) Food. D) Chemicals. Show Answer Correct Answer: B) Sunlight. 17. Describe the impact of climate change on ecosystems. A) Ecosystems thrive under climate change conditions. B) Climate change only affects human populations, not ecosystems. C) Climate change disrupts ecosystems by altering species distributions, causing habitat loss, and affecting food webs and biodiversity. D) Climate change has no effect on ecosystems. Show Answer Correct Answer: C) Climate change disrupts ecosystems by altering species distributions, causing habitat loss, and affecting food webs and biodiversity. 18. Which is NOT a life process? A) Photosynthesis. B) Reproduce. C) Sensitivity. D) Grow. Show Answer Correct Answer: A) Photosynthesis. 19. How does the energy flow through a food chain? A) Energy flows from predators to prey in a food chain. B) Energy flows from producers to consumers in a food chain. C) Energy flows from consumers to producers in a food chain. D) Energy flows from decomposers to producers in a food chain. Show Answer Correct Answer: B) Energy flows from producers to consumers in a food chain. 20. A community of animals and plants interacting with their environment is called: A) Ecosystem. B) Biome. C) Niche. D) Community. Show Answer Correct Answer: A) Ecosystem. 21. Some bacteria, such as Spirochaeta cytophaga, have the capacity to decompose cellulose by secreting enzymes to break down the cellulose externally and then absorbing the products. Which of the following would describe this organism best? A) Chemoautotroph. B) Saprotroph. C) Photoautotroph. D) Detritivore. Show Answer Correct Answer: B) Saprotroph. 22. What term describes all species within a habitat? A) Ecosystem. B) Population. C) Biome. D) Community. Show Answer Correct Answer: D) Community. 23. Which of the following ecosystems helps prevent flooding and erosion of soil? A) Wetlands. B) Grasslands. C) Oceans. D) None of the above. Show Answer Correct Answer: A) Wetlands. 24. Which biotic factor affects the size of a population of animals? A) Average temperature. B) Amount of oxygen. C) Availability of water. D) Kinds of predators. Show Answer Correct Answer: D) Kinds of predators. 25. A microhabitat has its own set of environmental conditions called its A) Climate. B) Macroclimate. C) Microclimate. D) Small biome. Show Answer Correct Answer: C) Microclimate. 26. The role an organism plays in its environment is known as its A) Habitat. B) Ecosystem. C) Biosphere. D) Niche. Show Answer Correct Answer: D) Niche. 27. Rantai makanan yang benar dalam ekosistem perairan adalah ..... A) Ikan herbivora $\rightarrow$ ikan karnivora $\rightarrow$ fitoplankton $\rightarrow$ pengurai. B) Pengurai $\rightarrow$ fitoplankton $\rightarrow$ ikan karnivora $\rightarrow$ ikan herbivora. C) Fitoplankton $\rightarrow$ ikan herbivora $\rightarrow$ ikan karnivora $\rightarrow$ pengurai. D) Fitoplankton $\rightarrow$ ikan karnivora $\rightarrow$ ikan herbivora $\rightarrow$ pengurai. Show Answer Correct Answer: C) Fitoplankton $\rightarrow$ ikan herbivora $\rightarrow$ ikan karnivora $\rightarrow$ pengurai. 28. The interval includes: A) An area of intolerance, an area of environmental stress and an optimal area. B) An optimal area for all populations of the ecosystem and areas for each of the specific populations. C) Different areas to those described above. D) An optimal area and two areas of environmental stress. Show Answer Correct Answer: B) An optimal area for all populations of the ecosystem and areas for each of the specific populations. 29. The place or natural conditions in which a plant or animal lives is called: A) Population. B) Ecosystem. C) Climate. D) Habitat. Show Answer Correct Answer: D) Habitat. 30. What will most likely be the result as humans move into new areas, forests are clear cut and housing developments are built? A) Global temperatures will decrease because trees are removed. B) Many organisms will lose their homes because their habitats have been destroyed. C) Better sanitation in the area will reduce the amount of pollution. D) The rainfall in the area will increase because there will be increased runoff. Show Answer Correct Answer: B) Many organisms will lose their homes because their habitats have been destroyed. 31. What factors can affect the population dynamics of a species? A) Availability of food and resources, predation, competition, disease, natural disasters, and human activities. B) Climate change and global warming. C) Social media influence. D) Alien invasion. Show Answer Correct Answer: A) Availability of food and resources, predation, competition, disease, natural disasters, and human activities. 32. Scientists are studying photosynthesis in a forest ecosystem that has plants, animals, and decomposers (which consume dead things). Which group or groups of organisms in the forest carry out photosynthesis? A) All organisms in the forest. B) Animals and decomposers. C) Plants and decomposers. D) Plants. Show Answer Correct Answer: D) Plants. 33. How is peat formed? A) From methanogenic archeans under anerobic and acidic conditions in deep sea vents. B) From partially decomposed organic matter under anaerobic and acidic conditions in waterlogged soils. C) From porous limestone under high pressure, aerobic and alkaline conditions in ocean beds. D) From bituminous coal under high pressure, anaerobic conditions below ground. Show Answer Correct Answer: B) From partially decomposed organic matter under anaerobic and acidic conditions in waterlogged soils. 34. What is Earth's carbon? A) Carbon found only in the atmosphere. B) Carbon that is only in plants. C) Carbon that is only in animals. D) Carbon trapped in matter underground, then converted to fossil fuels. Show Answer Correct Answer: D) Carbon trapped in matter underground, then converted to fossil fuels. 35. When growth stops, populations: A) Fluctuate around carrying capacity. B) Increase rapidly. C) Go extinct. D) Remain constant. Show Answer Correct Answer: A) Fluctuate around carrying capacity. 36. How do you calculate an average of 5 numbers? A) Add the five numbers together. B) Add the numbers together and divide by two. C) Add the numbers together and divide by five. D) Add the numbers together and multiply by five. Show Answer Correct Answer: C) Add the numbers together and divide by five. 37. What principle states that two species competing for the same resources cannot coexist? A) Resource Segregation Principle. B) Principle of Competitive Exclusion. C) Niche Partitioning Principle. D) Mutual Exclusion Principle. Show Answer Correct Answer: B) Principle of Competitive Exclusion. 38. What are the threats to biodiversity in today's world? A) Habitat destruction, climate change, pollution, overexploitation of natural resources, and invasive species. B) Alien abductions, government conspiracies, and zombie apocalypse. C) All the above. D) None of the above. Show Answer Correct Answer: A) Habitat destruction, climate change, pollution, overexploitation of natural resources, and invasive species. 39. What is the goal of mine reclamation? A) To create recreational parks. B) To increase the profitability of mining. C) To restore land to a natural or economically usable state. D) To expand mining operations. Show Answer Correct Answer: C) To restore land to a natural or economically usable state. 40. What is the primary source of energy for all life on Earth? A) Atmospheric gases. B) Soil nutrients. C) Water. D) The Sun. Show Answer Correct Answer: D) The Sun. 41. Cara hidup bersama antara dua organisme yang berlawanan yang satu mendapatkan keuntungan sedangkan yang lainnya tidak diuntungkan dan tidak dirugikan disebut ..... A) Simbiosis parasitisme. B) Simbiosis komensalisme. C) Simbiosis amensalisme. D) Simbiosis mutualisme. Show Answer Correct Answer: B) Simbiosis komensalisme. 42. Living and non-living things in one place and how they interact together are called an: A) Ecosystem. B) Population. C) Organism. D) Community. Show Answer Correct Answer: A) Ecosystem. 43. All of the following are negative impacts of human activity EXCEPT ..... A) Deforestation. B) Planting seeds. C) Overfishing. D) Pollution. Show Answer Correct Answer: B) Planting seeds. 44. The term 'ecosystem' was coined by A) Charles Darwin. B) R H whittakar. C) Sir Arthur Tansely. D) Lord Rutherford. Show Answer Correct Answer: C) Sir Arthur Tansely. 45. What is one potential impact of biotechnology on society? A) It can lead to ethical concerns regarding genetic modification. B) It is solely beneficial with no drawbacks. C) It has no impact on society. D) It only affects agricultural practices. Show Answer Correct Answer: A) It can lead to ethical concerns regarding genetic modification. 46. Which of the following describes a codon A) A type of tRNA molecules. B) A group of three amino acids. C) 3 RNA bases. D) A type of gene. Show Answer Correct Answer: C) 3 RNA bases. 47. Which increases population size? A) Death and emigration. B) Birth and immigration. C) Natural disasters. D) Predation. Show Answer Correct Answer: B) Birth and immigration. 48. Humans are considered ..... A) Consumers. B) Decomposers. C) Producers. D) None of the above. Show Answer Correct Answer: A) Consumers. 49. What do you call an organism that can make its own food? A) Decomposer. B) Heterotroph. C) Autotroph. D) Primary consumer. Show Answer Correct Answer: C) Autotroph. 50. Heterotrophs do not contain ..... A) Primary consumers. B) Secondary consumers. C) Top carnivores. D) Producers. Show Answer Correct Answer: D) Producers. 51. A ..... is defined as a carnivore that feeds on the bodies of dead organisms A) Consumer. B) Scavenger. C) Decomposer. D) None of the above. Show Answer Correct Answer: B) Scavenger. 52. Which of the following statements describes one way that energy is transferred in a food web? A) Producers store energy made by animals. B) Energy is cycled between producers. C) Plants provide energy to consumers. D) Consumers obtain energy directly from sunlight. Show Answer Correct Answer: C) Plants provide energy to consumers. 53. What role does climate change play in ecosystems according to the video? A) It stabilizes ecosystems. B) It contributes to mass extinction events. C) It has no significant impact. D) It increases biodiversity. Show Answer Correct Answer: B) It contributes to mass extinction events. 54. Producers are called ..... A) Autotrophs. B) Heterotrophs. C) All the above. D) None of the above. Show Answer Correct Answer: A) Autotrophs. 55. When birth rate is high and death rate is low ..... A) Population increases. B) Population decreases. C) Population stays the same. D) All of these. Show Answer Correct Answer: A) Population increases. 56. What is the term used to describe a community of living organisms and their physical environment? A) Habitat. B) Biome. C) Niche. D) Ecosystem. Show Answer Correct Answer: D) Ecosystem. 57. Which type of competition is more intense? A) Intraspecific. B) Interspecific. C) All the above. D) None of the above. Show Answer Correct Answer: A) Intraspecific. 58. Which symbiotic relationship is when one organism benefits and the other is not impacted (positively or negatively)? A) Predation. B) Commensalism. C) Parasitism. D) Mutualism. Show Answer Correct Answer: B) Commensalism. 59. Which plant organ is primarily responsible for photosynthesis? A) Stems. B) Flowers. C) Leaves. D) Roots. Show Answer Correct Answer: C) Leaves. 60. An omnivore is an organism that ..... A) Eats plants only. B) Eats meat only. C) Eats meat and plants. D) Produces its own energy via photosynthesis. Show Answer Correct Answer: C) Eats meat and plants. ← 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 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