This quiz works best with JavaScript enabled. Home > Cbse > Class 12 > Science > Biology > Class 12 Biology Chapter 14 Ecosystem – Quiz 1 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 14 Ecosystem Quiz 1 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Habitats where really small organisms live is called a A) Microenvironment. B) Microhabitat. C) Microbiome. D) A and b. Show Answer Correct Answer: D) A and b. 2. What is sustainability in the context of the biosphere? A) The ability to increase population density. B) The ability to preserve balance indefinitely. C) The ability to reduce carbon emissions. D) The ability to increase biodiversity. Show Answer Correct Answer: B) The ability to preserve balance indefinitely. 3. Which of the following Kingdoms are ONLY autotrophic? A) Protista. B) Plantae. C) Fungi. D) Bacteria. Show Answer Correct Answer: B) Plantae. 4. What does primary succession involve? A) Succession in a habitat with existing soil. B) Rapid colonization of new species. C) Recovery of an ecosystem after a disturbance. D) Changes in a lifeless habitat. Show Answer Correct Answer: D) Changes in a lifeless habitat. 5. Any necessity essential for live is called A) A resource. B) Food. C) Shelter. D) Water. Show Answer Correct Answer: A) A resource. 6. Name This Relationship:Brown Bear catching Salmon. A) Mutualism. B) Parasitism. C) Competition. D) Predation. Show Answer Correct Answer: D) Predation. 7. Animals must eat other organisms for food, so they are classified as ..... A) Prokaryotic. B) Autotrophs. C) Eukaryotic. D) Heterotrophs. Show Answer Correct Answer: D) Heterotrophs. 8. What are the factors that can lead to a decline in population size? A) Increased birth rates, low death rates, immigration, and improved healthcare. B) Low birth rates, high death rates, emigration, and disease outbreaks. C) All the above. D) None of the above. Show Answer Correct Answer: B) Low birth rates, high death rates, emigration, and disease outbreaks. 9. A close interdependent relationship between two species is called A) Toxic. B) Friendship. C) Symbiosis. D) Mutual Relationship. Show Answer Correct Answer: C) Symbiosis. 10. Which term describes the number of different species in the biosphere or in a particular area? A) Species diversity. B) Ecosystem. C) Succession. D) Genetic diversity. Show Answer Correct Answer: A) Species diversity. 11. A habitat that is suitable for a particular plant or animal to live. Or, the part that a plant or animal plays in an ecosystem is called: A) Niche. B) Population. C) Climate. D) Habitat. Show Answer Correct Answer: A) Niche. 12. Animals in the highest trophic level of a food chain will often be the largest in body size but will be few in numbers. What accounts for the small numbers? A) Food eaten by animals at the highest trophic level has a lower energy content per gram. B) Energy losses through the food chain. C) Conversion of heat energy into chemical energy. D) Biomass of producers is small. Show Answer Correct Answer: B) Energy losses through the food chain. 13. Describe the role of consumers in a food chain. A) Consumers obtain energy by photosynthesis. B) Consumers obtain energy by consuming other organisms. C) Consumers obtain energy by absorbing nutrients from the soil. D) Consumers play no role in the food chain. Show Answer Correct Answer: B) Consumers obtain energy by consuming other organisms. 14. Which of the following trophic levels would have the LEAST amount of available energy? A) Second order consumers (secondary consumers). B) Producers. C) Third order consumers (tertiary consumers). D) First order consumers (primary consumers). Show Answer Correct Answer: C) Third order consumers (tertiary consumers). 15. A landowner plans to harvest a large area of pine trees to sell for lumber. How can the landowner best sustain the pine trees as a natural resource? A) The landowner should consult a forester and replant the land with pine trees. B) The landowner should leave a few trees and let the land regenerate naturally. C) The landowner should replant the land with corn or soybeans. D) The landowner should plant a few genetically altered trees. Show Answer Correct Answer: A) The landowner should consult a forester and replant the land with pine trees. 16. Name This Relationship:An egret looking for insects stirred up by the movement of the rhino. A) Commensalism. B) Parasitism. C) Mutualism. D) Competition. Show Answer Correct Answer: A) Commensalism. 17. How might a lack of sunlight disrupt the food web? A) It would cause consumers to consume less. B) It would prevent decomposers from decomposing matter. C) It would prevent producers from making their own food. D) It would not disrupt the food web at all. Show Answer Correct Answer: C) It would prevent producers from making their own food. 18. Which process takes Carbon Dioxide from the air and converts it into a form of carbon used by living things? A) Precipitation. B) Bioremdiation. C) Photosynthesis. D) Respiration. Show Answer Correct Answer: C) Photosynthesis. 19. Aestivation can be seen in A) Autumn. B) Spring. C) Winter. D) Summer. Show Answer Correct Answer: D) Summer. 20. What are secondary consumers? A) Herbivores. B) Carnivores and Omnivores. C) Producers. D) Decomposers. Show Answer Correct Answer: B) Carnivores and Omnivores. 21. True or False:There are physical and biological environmental factors that affect which organisms can live in a habitat A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 22. What is a niche? A) The habitat in which an organism lives. B) An organism's role in an ecosystem. C) A type of consumer. D) The relationship between a producer and a consumer. Show Answer Correct Answer: B) An organism's role in an ecosystem. 23. Through evaporation, the ocean provides most of the water that makes up Earth's ..... A) Precipitation. B) Condensation. C) Evaporation. D) None of the above. Show Answer Correct Answer: A) Precipitation. 24. Which of the following is NOT a threat to biodiversity? A) Overhunting. B) Invasive species. C) Water purification. D) Biomagnification. Show Answer Correct Answer: C) Water purification. 25. Obtains energy and nutrients from autotrophs A) Parasite. B) Chemotroph. C) Anerobe. D) Heterotroph. Show Answer Correct Answer: D) Heterotroph. 26. What unique aspect of Australia is of interest when studying past ecosystems? A) The Australian biota. B) The Great Barrier Reef. C) Its desert landscapes. D) Its modern cities. Show Answer Correct Answer: A) The Australian biota. 27. Why does high biodiversity increase ecosystem stability? A) High biodiversity increases the carrying capacity of an ecosystem. B) More diversity increases the chances that organisms can survive changes to an ecosystem. C) Ecosystems are most stable when biodiversity is low. D) Ecosystems do best when populations are as large as possible. Show Answer Correct Answer: B) More diversity increases the chances that organisms can survive changes to an ecosystem. 28. What is the main cause of global warming? A) Deforestation. B) Burning of fossil fuels. C) Overfishing. D) Depletion of the ozone layer. Show Answer Correct Answer: B) Burning of fossil fuels. 29. An individual living thing is a/an ..... A) Organism. B) Population. C) Habitat. D) Ecosystem. Show Answer Correct Answer: A) Organism. 30. What is a concern regarding the rate of climate change? A) It is occurring at a faster rate than in the past. B) It has stopped in recent years. C) It is happening too slowly to be noticeable. D) It is completely predictable. Show Answer Correct Answer: A) It is occurring at a faster rate than in the past. 31. An organism that eats both plants and animals. A) Carnivore. B) Producer. C) Omnivore. D) Herbivore. Show Answer Correct Answer: C) Omnivore. 32. The bodies of all living things are based on carbon. Which of the following is the primary source of carbon in living things? A) Carbon compounds in the soil. B) Carbon dioxide in the atmosphere. C) Dissolved carbon dioxide in the biosphere. D) Carbon compounds stored in fossil fuels. Show Answer Correct Answer: B) Carbon dioxide in the atmosphere. 33. Which situation is a biotic factor operating within an ecosystem? A) The rate of water flow in a body of water. B) The concentration of hydrogen gas in the air. C) The kind of climate in a given region. D) Carnivores that eat other animals. Show Answer Correct Answer: D) Carnivores that eat other animals. 34. If the producer level of an ecosystem has 750, 000 J of energy, how much energy would be passed on to the secondary consumers? A) 75, 000 J. B) 75 J. C) 7, 500 J. D) 750 J. Show Answer Correct Answer: C) 7, 500 J. 35. Which is an example of herbivory affecting an ecosystem? A) Tall trees block the sunlight from reaching plants on the forest floor. B) Coyotes catch slow-moving rabbits, but not the faster rabbits. C) Deer eat the stems of plants without thorns, allowing plants with thorny stems to thrive. D) Fungi break down dead organic matter, which returns nutrients to the soil. Show Answer Correct Answer: C) Deer eat the stems of plants without thorns, allowing plants with thorny stems to thrive. 36. Which of the following is an example of ecological tolerance? A) A plant species that can survive in both high and low temperatures. B) A plant species that can only survive in low temperatures. C) A plant species that can only survive in high temperatures. D) A plant species that can survive in any temperature. Show Answer Correct Answer: A) A plant species that can survive in both high and low temperatures. 37. What movie is recommended for envisioning the future? A) 2040. B) An Inconvenient Truth. C) The Day After Tomorrow. D) Wall-E. Show Answer Correct Answer: A) 2040. 38. Water enters the atmosphere from trees through the process of A) Sublimation. B) Condensation. C) Transpiration. D) Evaporation. Show Answer Correct Answer: C) Transpiration. 39. What happens when a population reaches carrying capacity? A) Population growth continues indefinitely. B) The population will migrate to a new area. C) Resources become unlimited for the population. D) Growth & Immigration are equal to Death & Emigration. Show Answer Correct Answer: D) Growth & Immigration are equal to Death & Emigration. 40. What is habitat?Apakah maksud habitat? A) Living place of an organismtempat tinggal suatu organisma. B) Physical characteristics of an environmentciri-ciri fizikan suatu persekitaran. C) The interaction between living things and non-living thingsinteraksi antara benda hidup dan benda bukan bidup. D) None of the above. Show Answer Correct Answer: A) Living place of an organismtempat tinggal suatu organisma. 41. Which of the following factors is least likely to affect the variety of organisms that live in a freshwater environment? A) Oxygen levels. B) Water flow rate. C) Mud depth. D) Water temperature. Show Answer Correct Answer: C) Mud depth. 42. An oak tree is a/an ..... A) Secondary Consumer. B) Primary Consumer. C) Decomposer. D) Producer. Show Answer Correct Answer: D) Producer. 43. What is meant by the term 'interdependent'? A) Relying on each other. B) Independent. C) Competing for resources. D) Living in isolation. Show Answer Correct Answer: A) Relying on each other. 44. Refers to the ways in which organisms of certain species assist organisms of other species. A) Interdependence. B) Ecology. C) Environment. D) Community. Show Answer Correct Answer: A) Interdependence. 45. An owl and a hawk both eat mice. Which of these describes the relationship between a hawk and an owl? A) Parasitism. B) Mutualism. C) Competition. D) Predation. Show Answer Correct Answer: C) Competition. 46. What is the primary source of energy in an ecosystem? A) Plants. B) Animals. C) Sun. D) None of the above. Show Answer Correct Answer: C) Sun. 47. Which of the following describes the 10% rule A) Only 10% of predators catch a prey when they hunt. B) There is only 10% of the sun's energy available to us to use. C) Only 10% of the energy from each trophic level is passed on to the next. D) None of the above. Show Answer Correct Answer: C) Only 10% of the energy from each trophic level is passed on to the next. 48. Define community. A) Group of organisms living and interacting with each other in an area. B) Group of populations living and interacting with each other in an area. C) Group of organisms living and interacting with each other in an area at the same time. D) Abiotic and biotic factors that affect a population. Show Answer Correct Answer: B) Group of populations living and interacting with each other in an area. 49. Usually at the beginning of the food chain. Organisms that get their energy directly from the sun and can make their own food. A) Producers. B) Consumers. C) Decomposers. D) None of the above. Show Answer Correct Answer: A) Producers. 50. Consumers obtain energy source by: A) Consuming other organisms that are living or recently killed. B) Absorbing heat from their surroundings and converting it into chemical energy. C) By internally digesting deceased/decaying organisms. D) By externally digesting deceased/decaying organisms. Show Answer Correct Answer: A) Consuming other organisms that are living or recently killed. 51. If 100% energy is available in the first trophic level, how much energy is available for the next trophic level? A) 0.01%. B) 10%. C) 1%. D) 100%. Show Answer Correct Answer: B) 10%. 52. (10) Which land biome has warm summers and very cold winters with an average amount of precipitation and trees with seeds protected by cones? A) Tropical rainforest. B) Temperate grassland. C) Tundra. D) Coniferous forest. Show Answer Correct Answer: D) Coniferous forest. 53. What type of speciation is exemplified by the evolution that occurred on the Australian continent? A) Peripatric speciation. B) Allopatric speciation. C) Sympatric speciation. D) Parapatric speciation. Show Answer Correct Answer: B) Allopatric speciation. 54. Where an organism lives and what it does "for a living" A) Primary succession. B) Secondary succession. C) Niche. D) None of the above. Show Answer Correct Answer: C) Niche. 55. How many quadrats will of 1m$^{2}$ will fit into a field that is 20m long by 30 m wide A) 600. B) 500. C) 6. D) 5. Show Answer Correct Answer: A) 600. 56. Ants, birds, rabbits, and snakes are ..... A) Biotic. B) Abiotic. C) All the above. D) None of the above. Show Answer Correct Answer: A) Biotic. 57. A ..... is the populations of two or more species within the same geographical area and time period. A) Population. B) Community. C) Biome. D) Ecosystem. Show Answer Correct Answer: B) Community. 58. Which will most likely result in a negative growth rate in the human population of a country? A) The death rate is higher than the birth rate. B) The country has improved economic conditions. C) The country has made improvements in sanitation. D) The birth rate is higher than the death rate. Show Answer Correct Answer: A) The death rate is higher than the birth rate. 59. What does the energy pyramid show? A) Energy increases as it moves up trophic levels. B) The same amount of energy exists at all levels. C) Energy decreases at each level because only ~10% is passed on. D) Only consumers contain energy. Show Answer Correct Answer: C) Energy decreases at each level because only ~10% is passed on. 60. In the sea, little fish called pilot fish swim closely to sharks. The pilot fish clean the sharks, and the sharks provide protection for the pilot fish. What type of symbiosis is this? A) Mutualism. B) Amensalism. C) Commensalism. D) Parasitism. Show Answer Correct Answer: A) Mutualism. Next →Related QuizzesScience QuizzesClass 12 QuizzesClass 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 8Class 12 Biology Chapter 14 Ecosystem Quiz 9 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books