This quiz works best with JavaScript enabled. Home > Cbse > Class 12 > Science > Biology > Class 12 Biology Chapter 14 Ecosystem – Quiz 7 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 14 Ecosystem Quiz 7 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What is the aim of the GLOBIO model? A) To predict sports outcomes. B) To entertain policymakers. C) To explore outer space. D) To quantify global human impacts on biodiversity. Show Answer Correct Answer: D) To quantify global human impacts on biodiversity. 2. Healthy soil is able to provide all the nutrients that support plant growth, and to do so year after year. What biotic or abiotic factor directly supplies these nutrients? A) Microorganisms that live in the soil or on plant roots. B) Water from rain or melted snow. C) Weathered rocks in the soil. D) Grasses and other small plants. Show Answer Correct Answer: A) Microorganisms that live in the soil or on plant roots. 3. In Hawaii, there are volcanoes. Before anything was there, the volcanoes erupted which produced volcanic rock. Lichens were the first species to arrive, and they broke down the rock into soil. Eventually, plants began to grow. Now, the islands are functioning at their climax community.Is this an example of primary or secondary succession? A) Primary succession. B) Secondary succession. C) All the above. D) None of the above. Show Answer Correct Answer: A) Primary succession. 4. When more than one organism attempts to use the same resource you have A) Adaptation. B) Niche. C) Competition. D) Death. Show Answer Correct Answer: C) Competition. 5. Examples of a producer A) Mouse. B) Algae. C) Frog. D) Worm. Show Answer Correct Answer: B) Algae. 6. Which of the following ecosystems has temperature that stays the SAME top to bottom? A) Grasslands. B) Forests. C) Ponds and Lakes. D) None of the above. Show Answer Correct Answer: C) Ponds and Lakes. 7. What is the greatest threat to biodiversity? A) Global warming. B) Over harvesting. C) Invasive species. D) Habitat loss. Show Answer Correct Answer: D) Habitat loss. 8. Density-independent factors: A) Affect only crowded populations. B) Affect all populations regardless of size. C) Are predator-based. D) Are disease-based. Show Answer Correct Answer: B) Affect all populations regardless of size. 9. Why is it when habitat is fragmented, smaller population sizes lead to extinction? A) Small populations are unable to breed. B) Individuals will always migrate out of the area. C) There are too many individuals in one habitat. D) Gene flow is restricted and inbreeding occurs. Show Answer Correct Answer: D) Gene flow is restricted and inbreeding occurs. 10. Matter also moves by being recycled within and among ecosystems. These cycles of elements and compounds are called: A) Biogeochemical cycles. B) Biomolecules. C) Chemistry. D) None of the above. Show Answer Correct Answer: A) Biogeochemical cycles. 11. Which one of the following best defines the term 'food web'? A) The variety of food that a top carnivore eats. B) A combination of different heterotrophs. C) A long food chain with at least four trophic levels. D) A diagram that shows all the feeding interactions in an ecosystem. Show Answer Correct Answer: D) A diagram that shows all the feeding interactions in an ecosystem. 12. A relationship that helps one organism and doesn't hurt or help the other one.ex. barnacle on whale A) Mutualism. B) Predator/prey. C) Parasitism. D) Commensalism. Show Answer Correct Answer: D) Commensalism. 13. Non-living things in an ecosystem. A) Abiotic. B) Organism. C) Biotic. D) Zombies. Show Answer Correct Answer: A) Abiotic. 14. The overall flow of energy through an ecosystem is from A) Decomposers to consumers to producers. B) Producers to consumers to decomposers. C) Consumers to producers to decomposers. D) None of the above. Show Answer Correct Answer: B) Producers to consumers to decomposers. 15. As populations grow, they tend to spread out into new territory. Which limiting factor is most likely to become an issue? A) Shelter. B) Water. C) Space. D) Food. Show Answer Correct Answer: C) Space. 16. Which of the following is not example of ecosystem? A) Desert. B) Tropical forest. C) Group of gazelle. D) River. Show Answer Correct Answer: C) Group of gazelle. 17. What are limiting factors? A) Conditions that limit how much energy flows to the next trophic level. B) The maximum number of organisms an area can sustain. C) How diverse the populations of a community are. D) Scarce resources that limit the size of a population. Show Answer Correct Answer: D) Scarce resources that limit the size of a population. 18. How much energy passes throw each Trophic Level A) 100%. B) 10%. C) 50%. D) 20%. Show Answer Correct Answer: B) 10%. 19. Which organism below is NOT an example of a decomposer? A) Leaves. B) Mushroom. C) Worm. D) None of the above. Show Answer Correct Answer: A) Leaves. 20. Consumers are ..... A) Heterotrops. B) Autotrophs. C) All the above. D) None of the above. Show Answer Correct Answer: B) Autotrophs. 21. In a habitat, animals have a ..... , which is how they interact, get food and shelter. A) Niche. B) Ecosystem. C) Community. D) Population. Show Answer Correct Answer: A) Niche. 22. In a process called transpiration, plants get rid of excess water through pores in the leaves called stomata. This excess water is then released into the atmosphere as part of the water cycle. Which of the following terms best describes how the released water enters the atmosphere? A) Condensation. B) Capillary action. C) Precipitation. D) Evaporation. Show Answer Correct Answer: D) Evaporation. 23. What contains numerous producers and many consumers on several trophic levels A) Food niche. B) Food pyramid. C) Food chain. D) Food web. Show Answer Correct Answer: D) Food web. 24. How many species of eucalypts and acacias are there? A) Over 500 species. B) Over 700 species. C) Over 800 species. D) Over 600 species. Show Answer Correct Answer: C) Over 800 species. 25. Which is a non-living part of an ecosystem? A) Sunlight. B) Air. C) Water. D) All of these. Show Answer Correct Answer: D) All of these. 26. A graphic illustration that shows each trophic level and the amount of useable energy contained within. A) Food chain. B) Food web. C) Energy Pyramid. D) All of these. Show Answer Correct Answer: C) Energy Pyramid. 27. The type of plankton that produces most of the food in an aquatic ecosystem is called A) Phytoplankton. B) Benthos. C) Nekton. D) Zooplankton. Show Answer Correct Answer: A) Phytoplankton. 28. Trees that shed their leaves in the dry season are found in which forest? A) Tropical Evergreen Forest. B) Coniferous forests. C) Tropical Deciduous Forest. D) Temperate Deciduous Forest. Show Answer Correct Answer: C) Tropical Deciduous Forest. 29. Which layer of the rainforest receives the most sunlight? A) The canopy. B) The understory. C) The forest floor. D) None of the above. Show Answer Correct Answer: A) The canopy. 30. When medium sized plant species such as shrubs colonize an area it is called: A) Secondary Succession. B) Pioneer Species. C) Climax Community. D) Primary Succession. Show Answer Correct Answer: A) Secondary Succession. 31. A community is concerned about the water quality of a nearby lake. Increased sedimentation in the lake is endangering the native habitat. The increased sedimentation is most likely caused by which of the following? A) Trees planted along the shore of the lake. B) Construction of homes along the lake. C) The amount of fish in the lake. D) The amount of sunlight on the lake. Show Answer Correct Answer: B) Construction of homes along the lake. 32. A decomposer does not have a mouth and ..... A) Eats meat/animals/heterotrophs only to get its energy. B) Eats dead or living tissues by using chemicals. C) Eats both plants/autotrophs and meat/animals/heterotrophs to get its energy. D) Eats dead/decaying organisms only to get its energy. Show Answer Correct Answer: B) Eats dead or living tissues by using chemicals. 33. These conditions enable organisms to find enough energy and nutrients to maintain homeostasis, to grow and reproduce A) Microclimate. B) Tolerance. C) Optimum Range. D) Adaptation. Show Answer Correct Answer: C) Optimum Range. 34. When an area is colonized by the largest most mature plants it can support, it is called: A) Pioneer Species. B) Climax Community. C) Primary Succession. D) Secondary Succession. Show Answer Correct Answer: B) Climax Community. 35. Which of the following muscle cell get tired easily? A) Smooth. B) Cardiac. C) Skeletal. D) Cardiac and smooth. Show Answer Correct Answer: C) Skeletal. 36. What is used to describe a competition between two different species? A) Interspecific. B) Secondary consumer. C) Tertiary consumer. D) Intraspecific. Show Answer Correct Answer: A) Interspecific. 37. All the organisms of one kind in a certain area. A) Community. B) Population. C) Organism. D) Species. Show Answer Correct Answer: B) Population. 38. Which of the following is Not living? A) Virus. B) Bacteria. C) Mushroom. D) Fungus. Show Answer Correct Answer: A) Virus. 39. Where an organism lives and what it does for a living, including how they interact with biotic and abiotic factors is a species A) Niche. B) Habitat. C) Ecosystem. D) Community. Show Answer Correct Answer: A) Niche. 40. Which of the following describes the leaves in a coniferous forest? A) Circular-shaped. B) Square-shaped. C) Pointy with needles. D) None of the above. Show Answer Correct Answer: C) Pointy with needles. 41. Which two plant species are most associated with sclerophyll in Australia? A) Eucalyptus and Acacias. B) Mountain Devils and Macadamias. C) Grevilleas and Hakeas. D) Banksias and Waratahs. Show Answer Correct Answer: A) Eucalyptus and Acacias. 42. What are the smallest of all living things? A) Viruses. B) Molecules. C) Cells. D) Atoms. Show Answer Correct Answer: C) Cells. 43. What is the role of abiotic factors in an ecosystem? A) They determine the types of organisms that can survive. B) They have no role in an ecosystem. C) They only affect the non-living components of an ecosystem. D) They are responsible for the genetic diversity within species. Show Answer Correct Answer: A) They determine the types of organisms that can survive. 44. Nitrogen is released to the abiotic parts of the of the biosphere from the processes of death and ..... A) Decay by bacteria. B) Infiltration of the groundwater. C) Runoff. D) Lightning in the storm and clouds. Show Answer Correct Answer: A) Decay by bacteria. 45. A symbiotic relationship where one species benefits and the other is harmed. A) Symbiosis. B) Mutualism. C) Commensalism. D) Parasitism. Show Answer Correct Answer: D) Parasitism. 46. All living things need ..... and ..... factors to survive. A) Food and plants. B) Biotic and abiotic. C) Sunlight and good weather. D) Cans of tuna and water. Show Answer Correct Answer: B) Biotic and abiotic. 47. Choose the correct order of taxa from LARGEST to SMALLEST A) Phylum, Order, Species, Family, Genus, Kingdom. B) Kingdom, Phylum, Class, Order, Family, Genus, Species. C) Family, Kingdom, Order, Phylum, Class, Order, Species, Genus. D) Species, Genus, Family, Order, Class, Phylum, Kingdom. Show Answer Correct Answer: B) Kingdom, Phylum, Class, Order, Family, Genus, Species. 48. Primary consumers get energy from A) Eating producers. B) Consuming dead or decaying matter. C) Converting light energy from the sun to chemical energy. D) Eating other consumers. Show Answer Correct Answer: A) Eating producers. 49. Which of the following is a BIOTIC factor in an ecosystem? A) Trees. B) Rocks. C) Water. D) Air. Show Answer Correct Answer: A) Trees. 50. What is the main source of energy in a food chain? A) Plants. B) The sun. C) Animals. D) The soil. Show Answer Correct Answer: B) The sun. 51. Which of the following sets includes only abiotic factors? A) Light, water, pH, parasites. B) Soil, wind, shade, temperature. C) Rocks, competition, humidity, UV radiation. D) Pollution, decomposers, rainfall, drought. Show Answer Correct Answer: B) Soil, wind, shade, temperature. 52. The part of the environlent that keeps a population's size at a level below its full potential A) Limiting factor. B) Stopping factor. C) Carrying factor. D) None of the above. Show Answer Correct Answer: A) Limiting factor. 53. Where are most coral reefs found? A) Warm, shallow areas of the neritic zone. B) Deepest, dark areas of the benthic zone. C) Deep water of the open ocean. D) None of the above. Show Answer Correct Answer: A) Warm, shallow areas of the neritic zone. 54. Where does the energy in a food chain come from? A) Sun. B) Predators. C) Prey. D) Scavengers. Show Answer Correct Answer: A) Sun. 55. The plants and animals that live together in a habitat form a ..... A) Habitat. B) Community. C) Ecosystem. D) Population. Show Answer Correct Answer: B) Community. 56. Which of the following is NOT a characteristic that all organisms share? A) All organisms must use resources for energy. B) All organisms must produce food. C) All organisms respond to stimuli. D) All organisms reproduce. Show Answer Correct Answer: B) All organisms must produce food. 57. Which of the following is the characteristics of smooth muscle? A) Spindle shaped, has single central nucleus, work out of consciousness. B) Long cylindrical, has single central nucleus, work under consciousness. C) Spindle shaped, has many nucleus on the edge, work under consciousness. D) Long cylindrical, has single central nucleus, work out of consciousness. Show Answer Correct Answer: A) Spindle shaped, has single central nucleus, work out of consciousness. 58. The role an organism plays in its Ecosystem is its: A) Niche. B) Community. C) Competition. D) Biodiversity. Show Answer Correct Answer: A) Niche. 59. What is the term used to describe the process by which green plants and other organisms convert sunlight into chemical energy? A) Photosynthesis. B) Decomposition. C) Respiration. D) Dessication. Show Answer Correct Answer: A) Photosynthesis. 60. How does pH affect enzyme activity? A) Enzymes are only active at neutral pH. B) Enzymes are not affected by pH. C) Enzymes work best at any pH level. D) Extreme pH levels can denature enzymes, reducing their activity. Show Answer Correct Answer: D) Extreme pH levels can denature enzymes, reducing their activity. ← 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 5Class 12 Biology Chapter 14 Ecosystem Quiz 6Class 12 Biology Chapter 14 Ecosystem Quiz 8Class 12 Biology Chapter 14 Ecosystem Quiz 9 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books