This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Biology Chapter 14 Ecosystem – Quiz 35 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 14 Ecosystem Quiz 35 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Which of the following is NOT a reason for the decline in ecosystems? A) Introduction of native species. B) Overpopulation of terrestrial and marine resources. C) Spread of introduced herbivores, predators, weeds, and disease. D) Habitat loss and fragmentation. Show Answer Correct Answer: A) Introduction of native species. 2. The basic unit of structure and function in the human body is the ..... A) Organ. B) Organ system. C) Cell. D) Tissue. Show Answer Correct Answer: C) Cell. 3. Breaks down dead organisms A) Autotroph. B) Scavenger. C) Decomposer. D) Parasite. Show Answer Correct Answer: C) Decomposer. 4. The average weather pattern of a region over time A) Adapted. B) Climate. C) Habitat. D) Ecosystem disruption. Show Answer Correct Answer: B) Climate. 5. The first organism in a food chain is always a: A) Producer. B) Consumer. C) Decomposer. D) Any of the above. Show Answer Correct Answer: A) Producer. 6. Two factors that determine the type of biome that will exist in an area are: ..... and ..... A) Latitude, Precipitation. B) Latitude, Longitude. C) Longitude, Precipitation. D) Precipitation, Pollution. Show Answer Correct Answer: A) Latitude, Precipitation. 7. Which of the following is a symbiotic relationship in which one organism benefits while the other is unaffected? A) Mutualism. B) Parasitism. C) Commensalism. D) Microbiomes. Show Answer Correct Answer: C) Commensalism. 8. The total number of organism at each trophic level in the food chain is known as ..... A) Efficiency. B) Pyramid of numbers. C) Food web. D) Biomass. Show Answer Correct Answer: B) Pyramid of numbers. 9. Explain what a habitat is and provide an example. A) An example of a habitat is a desert for polar bears. B) A habitat is a type of food that animals eat, such as grass for lions. C) A habitat is a man-made structure like a building for birds. D) An example of a habitat is a coral reef for marine organisms. Show Answer Correct Answer: D) An example of a habitat is a coral reef for marine organisms. 10. A herd of zebras would be considered a A) Community. B) Species. C) Ecosystem. D) Population. Show Answer Correct Answer: D) Population. 11. How does competition affect population? A) Most populations do not have competition. B) It maximizes the carrying capacity of an ecosystem. C) It limits population sizes and drives natural selection. D) It benefits both species and increases their populations. Show Answer Correct Answer: C) It limits population sizes and drives natural selection. 12. Which factors would most likely cause an increase in a predator population? A) A decrease in the herbivore population and an increase in competition for food. B) A decrease in contagious diseases and an increase in available living space. C) An increase in available living space and a decrease in water supply. D) An increase in competition for food and a decrease in water supply. Show Answer Correct Answer: B) A decrease in contagious diseases and an increase in available living space. 13. Energy flows from a lower trophic level to a higher level as organisms are consumed. Approximately how much energy is used for metabolic functions or is released as heat, and therefore is not available to the next trophic level of organisms? A) 90%. B) 75%. C) 30%. D) 10%. Show Answer Correct Answer: A) 90%. 14. A ..... is the use of evidence to say why one idea is the best. A) Hypothesis. B) Answer. C) Claim. D) Arguement. Show Answer Correct Answer: D) Arguement. 15. Trophic Levels A) Any step in a nutritive series, or food chain, of an ecosystem. Organisms are classified into levels on the basis of their feeding behavior. B) Renewable organic material that comes from plants and animals. C) The number of people, other living organisms, or crops that a region can support without environmental degradation. D) Carnivores that eat other carnivores. Show Answer Correct Answer: A) Any step in a nutritive series, or food chain, of an ecosystem. Organisms are classified into levels on the basis of their feeding behavior. 16. How do cooperative behaviors increase fitness? A) They ensure every organism in a colony survives. B) They make sure that every member of a colony gets along. C) They increase the fitness of the population, though may harm the individual. D) They allow each organism to obtain the most resources possible. Show Answer Correct Answer: C) They increase the fitness of the population, though may harm the individual. 17. What is phototropism? A) When a plant loses it's leaves in the fall. B) It is what causes a plants stems to grow upwards. C) When a plant grows towards light. D) A plants response to touch. Show Answer Correct Answer: C) When a plant grows towards light. 18. What does a Secondary Consumer eat? A) Tertiary Consumers. B) Primary Consumers. C) Producers. D) Secondary Consumers. Show Answer Correct Answer: B) Primary Consumers. 19. Which statement best explains why animals are considered heterotrophic? A) They are able to produce food through the process of photosynthesis. B) They are able to produce food through the process of respiration. C) They are able to obtain nutrients by decomposing plant and animal tissue. D) They are able to obtain nutrients by consuming other organisms or their products. Show Answer Correct Answer: D) They are able to obtain nutrients by consuming other organisms or their products. 20. Which organisms are heterotrophs? A) Photosynthesizers. B) Producers. C) Consumers. D) Plants. Show Answer Correct Answer: C) Consumers. 21. Select the correct plant or animal that can be found in the rainforest ecosystem. A) Zebra. B) Dog. C) Elephant. D) Snake. E) Pine tree. Show Answer Correct Answer: D) Snake. 22. A producer is ..... A) Something that makes its own food. B) An animal that has live young. C) An animal that only eats plants. D) A predator that hunts prey. Show Answer Correct Answer: A) Something that makes its own food. 23. The geographic grid lines on the globe that extend vertically. A) Biome. B) Longitude. C) Eutrophication. D) Habitat Fragmentation. Show Answer Correct Answer: B) Longitude. 24. Ecosystems can be delicate. Our nutrient cycles are changing because of ..... A) Human activity. B) Lack of water. C) Excess sunlight. D) None of the above. Show Answer Correct Answer: A) Human activity. 25. Carbon dioxide in the atmosphere enters the biotic parts of the biosphere through ..... A) Burning of forests. B) Photosynthesis. C) Combustion of fossil fuels. D) All of these. Show Answer Correct Answer: B) Photosynthesis. ← PreviousNext →Related 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 8Class 12 Biology Chapter 14 Ecosystem Quiz 9Class 12 Biology Chapter 14 Ecosystem Quiz 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books