This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Biology Chapter 14 Ecosystem – Quiz 1 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 14 Ecosystem Quiz 1 (25 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 biodiversity. B) The ability to preserve balance indefinitely. C) The ability to reduce carbon emissions. D) The ability to increase population density. Show Answer Correct Answer: B) The ability to preserve balance indefinitely. 3. Which of the following Kingdoms are ONLY autotrophic? A) Bacteria. B) Protista. C) Fungi. D) Plantae. Show Answer Correct Answer: D) Plantae. 4. What does primary succession involve? A) Recovery of an ecosystem after a disturbance. B) Succession in a habitat with existing soil. C) Rapid colonization of new species. 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) Food. B) Water. C) A resource. D) Shelter. Show Answer Correct Answer: C) A resource. 6. Name This Relationship:Brown Bear catching Salmon. A) Predation. B) Competition. C) Parasitism. D) Mutualism. Show Answer Correct Answer: A) Predation. 7. What is the function of lysosomes? A) Store and regulate DNA. B) Organizing microtubules that serve as the cell's skeletal system. C) Store nutrients and water. D) Protein synthesis. Show Answer Correct Answer: B) Organizing microtubules that serve as the cell's skeletal system. 8. Animals must eat other organisms for food, so they are classified as ..... A) Heterotrophs. B) Autotrophs. C) Eukaryotic. D) Prokaryotic. Show Answer Correct Answer: A) Heterotrophs. 9. 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. 10. A close interdependent relationship between two species is called A) Symbiosis. B) Mutual Relationship. C) Toxic. D) Friendship. Show Answer Correct Answer: A) Symbiosis. 11. Which term describes the number of different species in the biosphere or in a particular area? A) Succession. B) Ecosystem. C) Genetic diversity. D) Species diversity. Show Answer Correct Answer: D) Species diversity. 12. 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) Population. B) Niche. C) Climate. D) Habitat. Show Answer Correct Answer: B) Niche. 13. 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. 14. Describe the role of consumers in a food chain. A) Consumers obtain energy by absorbing nutrients from the soil. B) Consumers obtain energy by consuming other organisms. C) Consumers play no role in the food chain. D) Consumers obtain energy by photosynthesis. Show Answer Correct Answer: B) Consumers obtain energy by consuming other organisms. 15. Which of the following trophic levels would have the LEAST amount of available energy? A) Producers. B) First order consumers (primary consumers). C) Second order consumers (secondary consumers). D) Third order consumers (tertiary consumers). Show Answer Correct Answer: D) Third order consumers (tertiary consumers). 16. 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. 17. Name This Relationship:An egret looking for insects stirred up by the movement of the rhino. A) Competition. B) Parasitism. C) Commensalism. D) Mutualism. Show Answer Correct Answer: C) Commensalism. 18. 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. 19. What is the primary function of the phloem in plants? A) Transporting water. B) Transporting nutrients and sugars. C) Providing structural support. D) Absorbing sunlight. Show Answer Correct Answer: B) Transporting nutrients and sugars. 20. Which process takes Carbon Dioxide from the air and converts it into a form of carbon used by living things? A) Precipitation. B) Photosynthesis. C) Respiration. D) Bioremdiation. Show Answer Correct Answer: B) Photosynthesis. 21. Aestivation can be seen in A) Summer. B) Winter. C) Spring. D) Autumn. Show Answer Correct Answer: A) Summer. 22. What are secondary consumers? A) Herbivores. B) Carnivores and Omnivores. C) Producers. D) Decomposers. Show Answer Correct Answer: B) Carnivores and Omnivores. 23. 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. 24. 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. 25. 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. 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