This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Biology Chapter 14 Ecosystem – Quiz 22 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 14 Ecosystem Quiz 22 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. If there were no decomposers, which of the following would most likely happen? A) Plants and animals would remain living for a longer period of time. B) Animals would start carrying out photosynthesis. C) The amount of dead plant and animal matter would decrease. D) Some plants might die due to a shortage of important nutrients. Show Answer Correct Answer: D) Some plants might die due to a shortage of important nutrients. 2. The variety of species found in Earth's land and water ecosystems A) Biome. B) Biology. C) Biosphere. D) Biodiversity. Show Answer Correct Answer: D) Biodiversity. 3. A series of organisms that depend on one another for food. A) Producer. B) Consumer. C) Food chain. D) Food web. Show Answer Correct Answer: C) Food chain. 4. The dry skinned and spiny exoskeleton animals can be seen in A) Forest ecosystem. B) Grassland ecosystem. C) Pond ecosystem. D) Desert ecosystem. Show Answer Correct Answer: D) Desert ecosystem. 5. A biome is ..... A) The height of land above sea level. B) A horizontal movement of ocean water caused by wind that occurs near the ocean's surface. C) A large region characterized by a specific type of climate and certain types of plants and animals. D) Always have higher temperatures than the surrounding countryside. Show Answer Correct Answer: C) A large region characterized by a specific type of climate and certain types of plants and animals. 6. What does the following equation represent? Sunlight +6H20 + 6CO2$\rightarrow$ C6H1206 +6O2 A) Cellular respiration. B) Human respiration. C) Photosynthesis. D) Solar energy. Show Answer Correct Answer: C) Photosynthesis. 7. What significant change occurred as Australia drifted northwards? A) Decrease in land mass. B) Changes in climate and biota. C) Expansion of rainforests. D) Increase in volcanic activity. Show Answer Correct Answer: B) Changes in climate and biota. 8. Density-independent factor: A) Competition. B) Predation. C) Parasites. D) Hurricane. Show Answer Correct Answer: D) Hurricane. 9. Which symbols best describe commensalism? A) +, +. B) +, -. C) +, 0. D) 0, 0. Show Answer Correct Answer: C) +, 0. 10. Which of the following organisms would be in the uppermost trophic level on a trophic pyramid? A) Eagles. B) Grass. C) Rabbits. D) Fish. Show Answer Correct Answer: A) Eagles. 11. Mosquitoes feeding on humans is an example of what type of species interaction? A) Competition. B) Predation. C) Parasitism. D) Commensalism. Show Answer Correct Answer: C) Parasitism. 12. A consumer that only feeds on plants is called A) Producer. B) Herbivore. C) Carnivore. D) Omnivore. Show Answer Correct Answer: B) Herbivore. 13. Describe the role of decomposers in a food chain. A) Decomposers regulate the population of predators in the ecosystem. B) Decomposers create new organisms in the food chain. C) Decomposers help in the process of photosynthesis. D) Decomposers break down dead organisms and organic matter, releasing nutrients back into the ecosystem. Show Answer Correct Answer: D) Decomposers break down dead organisms and organic matter, releasing nutrients back into the ecosystem. 14. An animal that is hunted and killed by another animal for food is ..... A) Predator. B) Prey. C) Scavenger. D) Decomposer. Show Answer Correct Answer: B) Prey. 15. Which organization creates and shares computer modeling systems for evaluating human activity on ecosystems? A) United Nations Environmental Program. B) UNESCO. C) World Health Organization. D) NASA. Show Answer Correct Answer: A) United Nations Environmental Program. 16. How do CFCs affect the ozone layer? A) They strengthen it. B) They cause it to expand. C) They create holes in it. D) They have no effect. Show Answer Correct Answer: C) They create holes in it. 17. Which type of symbiosis involves one species benefitting while the other is harmed? +/- A) Mutualism. B) Commensalism. C) Parasitism. D) None of the above. Show Answer Correct Answer: C) Parasitism. 18. Which is not an element of biodiversity? A) Ecosystem diversity. B) Species diversity. C) Genetic diversity. D) Habitat diversity. Show Answer Correct Answer: D) Habitat diversity. 19. The squirrel eats nuts, seeds, and insects. It builds a nest in a tree. It is eaten by foxes, hawks, and racoons. It buries its food in the ground for storage over the winter-this helps disperse the seeds for plants. It carries diseases that can be spread in the community.This situation best shows the squirrel's ..... A) Niche. B) Habitat. C) Ecosystem. D) Community. Show Answer Correct Answer: A) Niche. 20. Which of the following is an abiotic part of a river that will affect the organisms that currently live in or near the river? A) The diversity of the life in the river. B) The speed at which the water flows. C) The predators living near the river. D) The algae in the water. Show Answer Correct Answer: B) The speed at which the water flows. 21. A tick and a dog have this type of relationship. A) Mutualism. B) Commensalism. C) Neutralism. D) Parasitism. Show Answer Correct Answer: D) Parasitism. 22. Despite their tremendous diversity, all organisms have the same basic needs; energy and matter. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 23. An organism that eats only meat. A) Herbivore. B) Carnivore. C) Omnivore. D) Producer. Show Answer Correct Answer: B) Carnivore. 24. Students are describing the ecosystem in an area. Which of these lists ALL the components the students should include in their description? A) All plant and animal species. B) All living and non-living factors. C) All weather patterns and climates. D) All elements and chemical substances. Show Answer Correct Answer: B) All living and non-living factors. 25. Cougars are predators that often eat weakened or diseased animals. this is a description of the ..... of cougars. A) Habitat. B) Community. C) Niche. D) None of these. Show Answer Correct Answer: C) Niche. ← 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