This quiz works best with JavaScript enabled. Home > Cbse > Class 12 > Science > Biology > Class 12 Biology Chapter 13 Organisms And Populations – Quiz 2 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 13 Organisms And Populations Quiz 2 (51 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Which of the following describes an interaction between a biotic factor and an abiotic factor? A) A vulture eats the remains of a wild pig. B) A black bear uses a cave for a winter home. C) A squirrel gathers nuts to store for winter. D) A pair of birds build a nest in a tree. Show Answer Correct Answer: B) A black bear uses a cave for a winter home. 2. In which of the following interactions both partners are adversely affected? A) Competition. B) Parasitism. C) Predation. D) Amensalism. Show Answer Correct Answer: A) Competition. 3. Nonliving elements in an ecosystem are called ..... A) Limiting factors. B) Abiotic factors. C) Fear factors. D) Biotic factors. Show Answer Correct Answer: B) Abiotic factors. 4. Animals from two different species utilize the same source of nutrition in one area. It is most accurate to say that the animals ..... A) Will learn to get along. B) Will compete for food. C) Will die because there will not be enough food for both of them. D) Will learn to eat different foods. Show Answer Correct Answer: B) Will compete for food. 5. A group of organisms that are similar to one another and can mate to produce offspring A) Competition. B) Species. C) Ecosystem. D) Limited resources. Show Answer Correct Answer: B) Species. 6. Which would be the impact on producers and consumers if the decomposers in an ecosystem suddenly disappeared? A) There will be less nutrients available. B) There will be a decreased amount of oxygen. C) There will be an excess amount of energy available. D) There will be an increase in atmospheric carbon. Show Answer Correct Answer: A) There will be less nutrients available. 7. Temperature, light, air, water, and climate are all ..... factors of the environment. A) Biotic. B) Abiotic. C) All the above. D) None of the above. Show Answer Correct Answer: B) Abiotic. 8. Which of the following would be an abiotic limiting factor for oysters living in the Chesapeake Bay? A) The amount of sediment in the water. B) The number of humans collecting them. C) The amount of algae in the water. D) The number of parasites. Show Answer Correct Answer: A) The amount of sediment in the water. 9. Basic unit of ecological hierarchy is- A) Individual. B) Ecosystem. C) Population. D) Community. Show Answer Correct Answer: A) Individual. 10. Source or supply from which benefit is produced A) Resources. B) Population. C) Ecosystem. D) Competition. Show Answer Correct Answer: A) Resources. 11. Which of the following countries has the highest biodiversity? A) Russia. B) India. C) South Africa. D) Brazil. Show Answer Correct Answer: D) Brazil. 12. In a given area, if the population of predators increases, the population of prey will ..... A) Remain about the same. B) Go extinct. C) Decrease. D) Increase. Show Answer Correct Answer: C) Decrease. 13. Major biomes of India include- A) Tropical rain forest. B) Deciduous forest. C) Desert and sea coast. D) All. Show Answer Correct Answer: D) All. 14. What does a population consist of? A) Only one organism. B) Many different abiotic factors. C) More than one of the same organism. D) Many different biotic factors. Show Answer Correct Answer: C) More than one of the same organism. 15. If a population of 50 paramecium present in a pool increases to 150 after an hour, then what would be the growth rate of population ..... A) 50 per hour. B) 100 per hour. C) 200 per hour. D) 5 per hour. Show Answer Correct Answer: B) 100 per hour. 16. Which is an example of a BIOTIC factor in the environment? A) Amount of helium gas in the air. B) Flow of water in a river. C) Carnivores that consume other animals. D) The climate in the region. Show Answer Correct Answer: C) Carnivores that consume other animals. 17. The active chemical drug reserpine is obtained from A) Papaver. B) Datura. C) Rauwolfia. D) Atropa. Show Answer Correct Answer: C) Rauwolfia. 18. Which of the following is not a biotic factor? A) Mushroom. B) Coyote. C) Air. D) Elephant. Show Answer Correct Answer: C) Air. 19. If a population grows larger than the carrying capacity: A) Birthrate may rise. B) Birthrate must fall. C) Birth and death rates remain the same. D) Death rate must fall. Show Answer Correct Answer: B) Birthrate must fall. 20. What is a abiotic factor? A) Anything that is living, or once living. B) Things that are not living, and never were living. C) None of the above. D) All of the above. Show Answer Correct Answer: B) Things that are not living, and never were living. 21. Sunlight is an example of an A) Ecosystem. B) Organism. C) Abiotic factor. D) Biotic factor. Show Answer Correct Answer: C) Abiotic factor. 22. Which of the following correctly lists the levels of organization from least complex to most complex? A) Community, Organism, Population, Ecosystem. B) Population, Community, Ecosystem, Organism. C) Organism, Population, Community, Ecosystem. D) Ecosystem, Population, Organism, Community. Show Answer Correct Answer: C) Organism, Population, Community, Ecosystem. 23. Autecology is study of ecology of A) Individual. B) Population. C) Species. D) Both (b) and (c). Show Answer Correct Answer: D) Both (b) and (c). 24. Which one is the famous plant ecologist of India? A) Charles Darwin. B) Ramdeva Misra. C) Birbal Sahani. D) Jagdish Chandra Bose. Show Answer Correct Answer: B) Ramdeva Misra. 25. Ecology (=oekologie) was coined by A) Odum / Lamarck. B) Harvey. C) Linnaeus. D) Haeckel. Show Answer Correct Answer: D) Haeckel. 26. A regional ecological unit having a specific climate is- A) Biome. B) Landscape. C) Ecosystem. D) Biotic community. Show Answer Correct Answer: A) Biome. 27. Two species of fish live in the same pond. Which of the following would increase competition between these two species of fish? A) Number of food plants the fish eat increases. B) Water level in the pond decreases. C) Population of birds that eat the fish increases. D) Habitat temperature increases. Show Answer Correct Answer: B) Water level in the pond decreases. 28. The highest level of ecological hierarchy is A) Ecosystem. B) Biosphere. C) Biome. D) Landscape. Show Answer Correct Answer: B) Biosphere. 29. A sedentary sea anemone gets attached to the shell lining of hermit crab. The association is ..... A) Symbiosis. B) Commensalism. C) Ectoparasitism. D) Amensalism. Show Answer Correct Answer: A) Symbiosis. 30. Temperature is an example of what kind of factor? A) Living. B) Biotic. C) Dead. D) Abiotic. Show Answer Correct Answer: D) Abiotic. 31. A population is a: A) Group of organisms of more than one species that live in a given area. B) Group of organisms of a single species that lives in a given area. C) Group of biotic and abiotic factors in an ecosystem. D) A group of biomes. Show Answer Correct Answer: B) Group of organisms of a single species that lives in a given area. 32. If an invasive species is introduced to an ecosystem that eats that same plants as the rabbits in the ecosystem, what will happen to the rabbit population? A) The rabbit population will likely increase. B) The rabbit population will likely decrease. C) The rabbit population will stay the same. D) None of the above. Show Answer Correct Answer: B) The rabbit population will likely decrease. 33. Most animals are tree dwellers in a: ..... A) Tropical Rain forest. B) Temperate deciduous forest. C) Thorn wood land. D) Coniferous forest. Show Answer Correct Answer: A) Tropical Rain forest. 34. Which abiotic factor is phytoplankton most likely to compete for in a marine environment? A) Sunlight. B) Fish. C) Rocks. D) None of the above. Show Answer Correct Answer: A) Sunlight. 35. An organism that gets its energy by feeding on producers in the food chain A) Competition. B) Primary consumer. C) Producer. D) Secondary consumer. Show Answer Correct Answer: B) Primary consumer. 36. An example of a population is A) All trees in a forest. B) All maple trees in a forest. C) All plants in a forest. D) All animals in a forest. Show Answer Correct Answer: B) All maple trees in a forest. 37. An animal that eats other animals that eat plants A) Resources. B) Abiotic. C) Secondary consumer. D) Ecosystem. Show Answer Correct Answer: C) Secondary consumer. 38. Living and nonliving things interacting in an environment is called: A) Organism. B) Ecosystem. C) Producer. D) Consumer. Show Answer Correct Answer: B) Ecosystem. 39. A population's ..... determines whether the population size increases, decreases, or stays the same. A) Death rate. B) Logistic curve. C) Birth rate. D) Growth rate. Show Answer Correct Answer: D) Growth rate. 40. Under ideal conditions with unlimited resources, a population will grow ..... A) Negatively. B) Slowly. C) Logistically. D) Exponentially. Show Answer Correct Answer: D) Exponentially. 41. Which of the following is a partial root parasite? A) Sandal wood. B) Orobanche. C) Cuscuta. D) Viscum. Show Answer Correct Answer: A) Sandal wood. 42. When two or more individuals or populations attempt to obtain a single resource A) Abiotic. B) Population. C) Organism. D) Competitive interaction. Show Answer Correct Answer: D) Competitive interaction. 43. In a pond there were 40 lotus plants. after a year, the number rose to 56. Calculate the birth rate of a lotus plant. A) 0.5. B) 0.4. C) 0.2. D) 0.6. Show Answer Correct Answer: B) 0.4. 44. Which is an example of an ABIOTIC factor in a pond environment? A) The water. B) A grasshopper. C) A snake. D) A frog. Show Answer Correct Answer: A) The water. 45. Amensalism is an association between two species where: A) One species is harmed and other is benefitted. B) One species is harmed and other is unaffected. C) One species is benefitted and other is unaffected. D) Both the species are harmed. Show Answer Correct Answer: B) One species is harmed and other is unaffected. 46. Which of the following is an abioitic factor that could affect biotic factors? A) Number of herbivores. B) Presence of harmful bacteria. C) Length of daylight. D) Population of rabbits. Show Answer Correct Answer: C) Length of daylight. 47. What is a biotic factor? A) Anything that is living, or once living. B) Anything that is not alive. C) Something that you see in a store. D) None of the above. Show Answer Correct Answer: A) Anything that is living, or once living. 48. When an organism depends on a factor for survival A) Dependent interaction. B) Biotic. C) Competition. D) Ecosystem. Show Answer Correct Answer: A) Dependent interaction. 49. What is the second least complex section of the levels of organization? A) Comunnity. B) Ecosystem. C) Organism. D) Population. Show Answer Correct Answer: D) Population. 50. The factors that can affect population size are A) Birth rate. B) Death rate. C) Rate at which individuals enter or leave the population. D) All answers are correct. Show Answer Correct Answer: D) All answers are correct. 51. A population can ..... when its birth rate is higher than its death rate. A) Shrink. B) Stay constant. C) Grow. D) None of the above. Show Answer Correct Answer: C) Grow. ← PreviousRelated QuizzesScience QuizzesClass 12 QuizzesClass 12 Biology Chapter 13 Organisms And Populations Quiz 1Class 12 Biology Chapter 1 Reproduction In Organisms QuizClass 12 Biology Chapter 10 Microbes In Human Welfare QuizClass 12 Biology Chapter 11 Biotechnology Principles And Processes QuizClass 12 Biology Chapter 12 Biotechnology And Its Applications QuizClass 12 Biology Chapter 14 Ecosystem QuizClass 12 Biology Chapter 15 Biodiversity And Conservation QuizClass 12 Biology Chapter 16 Environmental Issues Quiz 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books