This quiz works best with JavaScript enabled. Home > Cbse > Class 12 > Science > Biology > Class 12 Biology Chapter 13 Organisms And Populations – Quiz 1 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 13 Organisms And Populations Quiz 1 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The study of inter-relationship between living organisms and their environment is called A) Ecosystem. B) Phytosociology. C) Phytogeography. D) Ecology. Show Answer Correct Answer: D) Ecology. 2. A protozoan reproduces by binary fission. What will be the number of protozoans in its population after six generations? A) 128. B) 64. C) 24. D) 32. Show Answer Correct Answer: B) 64. 3. The interaction found between Balanus and chathamalus is A) Competition. B) Parasitism. C) Commensalism. D) Predation. Show Answer Correct Answer: A) Competition. 4. What are the key elements that lead to so much variation in the physical and chemical conditions of different habitats? A) Temperature and light. B) Soil and water. C) Only soil. D) Temperature, light, soil and water. Show Answer Correct Answer: D) Temperature, light, soil and water. 5. Among the ecosystem mentioned below, where can you find the maximum biodiversity? A) Alpine meadows. B) Mangroves. C) Coral reefs. D) Desert. Show Answer Correct Answer: C) Coral reefs. 6. A group of different species that live together and interact in an environment are called a/an ..... A) Population. B) Community. C) Habitat. D) Ecosystem. Show Answer Correct Answer: B) Community. 7. According to Allens rule, the mammals from colder climates have A) Shorter ears and longer limbs. B) Longer ears and shorter limbs. C) Longer ears and longer limbs. D) Shorter ears and shorter limbs. Show Answer Correct Answer: D) Shorter ears and shorter limbs. 8. Formation of tropical forests needs mean annual temperature and mean annual precipitation as: A) 18-25$^\circ$C and 150-400 cm. B) 5-15$^\circ$C and 50-100 cm. C) 30-50$^\circ$C and 100-150 cm. D) 5-15$^\circ$C and 100-200 cm. Show Answer Correct Answer: A) 18-25$^\circ$C and 150-400 cm. 9. Which of the following is the most ecologically relevant environmental factor? A) Temperature. B) Water. C) Light. D) Soil. Show Answer Correct Answer: A) Temperature. 10. False statement is- A) Habitat includes both biotic and abiotic factors. B) Ecology at the organismic level is essential physiological ecology. C) Abiotic and biotic components interact constantly with each other. D) None of the above. Show Answer Correct Answer: D) None of the above. 11. Gause's principle of competitive exclusion states that: ..... A) More abundant species will exclude the less abundant species through competition. B) Competition for the same resources excludes species having different food preferences. C) No two species can occupy the same niche indefinitely for the same limiting resources. D) Larger organisms exclude smaller ones through competition. Show Answer Correct Answer: C) No two species can occupy the same niche indefinitely for the same limiting resources. 12. Community is the level of organization which is best described as all- A) Members of a certain species in a given area. B) Members of a species regardless of where they live. C) Living things, regardless of species, in an area. D) Living and non-living components of an area. Show Answer Correct Answer: C) Living things, regardless of species, in an area. 13. "Bio" is a prefix that means ..... A) Not. B) Science. C) Book. D) Life. Show Answer Correct Answer: D) Life. 14. The maximum amount of organisms of a species that can be supported by an environment is: A) Carrying capacity. B) Logistic growth. C) Exponential growth. D) Population growth. Show Answer Correct Answer: A) Carrying capacity. 15. If '+' sign is assigned to beneficial interaction '-' sign to detrimental and '0' sign to neutral interaction, then the population interaction represented by '+' '-' refers to: ..... A) Mutualism. B) Amensalism. C) Parasitism. D) Commensalism. Show Answer Correct Answer: C) Parasitism. 16. Immediately after a forest fire, the primary consumers in the area will compete most for which biotic factor? A) Oxygen. B) Sunlight. C) Space. D) Food. Show Answer Correct Answer: D) Food. 17. Not living, or produced by living things A) Limited resources. B) Biotic. C) Organism. D) Abiotic. Show Answer Correct Answer: D) Abiotic. 18. At what level of organization in an ecosystem is an individual plant or animal? A) Population. B) Organism. C) Ecosystem. D) Community. Show Answer Correct Answer: B) Organism. 19. Plants interact with living and nonliving components in their environment. Which is an interaction with a nonliving element? A) Small insects eating the stems of the plants. B) Humans breathing oxygen released by plants. C) Bees gathering pollen from flowers of plants. D) Sandy soil holding the roots of the plants. Show Answer Correct Answer: D) Sandy soil holding the roots of the plants. 20. Individuals of a species which occur in a particular area constitute A) Flora. B) Fauna. C) Population. D) Flora and fauna. Show Answer Correct Answer: C) Population. 21. What parameters are used for tiger census in our country's national parks and sanctuaries? A) Pug marks only. B) Pug marks and faecal pellets. C) Faecal pellets only. D) Actual head counts. Show Answer Correct Answer: B) Pug marks and faecal pellets. 22. What will happen to a well growing herbaceous plant in the forest if it is transplanted outside the forest in a park? A) It will grow normally. B) It will grow well because it is planted in the same locality. C) It may not survive because of change in its micro climate. D) It grows very well because the plant gets more sunlight. Show Answer Correct Answer: C) It may not survive because of change in its micro climate. 23. More than one individual or population in an ecosystem relies upon the same limited resources A) Interaction. B) Population. C) Ecosystem. D) Competition. Show Answer Correct Answer: D) Competition. 24. Which is an example of a seasonal change to a BIOTIC factor? A) Temperatures get cooler in the fall. B) Hours of sunlight increase the summer. C) Birds fly south for the winter. D) Rainfall increases in the spring. Show Answer Correct Answer: C) Birds fly south for the winter. 25. A biologist studied the population of rats in a barn. He found that the average natality was 250, average mortality 240, immigration 20 and emigration 30. The net increase in population is ..... A) 0. B) 05. C) 10. D) 15. Show Answer Correct Answer: A) 0. 26. Ecological niche is: A) The surface area of the ocean. B) An ecologically adapted zone. C) The physical position and functional role of a species within the community. D) Formed of all plants and animals living at the bottom of a lake. Show Answer Correct Answer: C) The physical position and functional role of a species within the community. 27. A system comprising all the biotic and abiotic factors in an area and all the interactions among them A) Ecosystem. B) Population. C) Solar system. D) Competition. Show Answer Correct Answer: A) Ecosystem. 28. A group of interacting individuals of the same species located in the same area A) Competition. B) Limited resources. C) Population. D) Ecosystem. Show Answer Correct Answer: C) Population. 29. Mycorrhizae are the example of ..... A) Mutualism. B) Parasitism. C) Amensalism. D) Commensalism. Show Answer Correct Answer: A) Mutualism. 30. What is the lowest level of organization of the biosphere, or the one that has the fewest members? A) Ecosystem. B) Population. C) Organism. D) Community. Show Answer Correct Answer: C) Organism. 31. Something that is needed by organisms and is not infinite in its abundance in the environment; if it is exhausted, then the organisms that need it cannot survive A) Competition. B) Ecosystem. C) Population. D) Limited resources. Show Answer Correct Answer: D) Limited resources. 32. Ecology takes into account only A) Environmental factors. B) Plant adaptations. C) Effect of environment on plants. D) All of the above. Show Answer Correct Answer: D) All of the above. 33. A few organisms can tolerate and thrive a wide range of temperature. Such animals are called ..... A vast majority of animals are restricted to a narrow range of temperature. Such animals are called ..... A) Stenothermal, eurythermal. B) Thermophobic, thermophilic. C) Thermoscopic, Unthermoscopic. D) Eurythermal, stenothermal. Show Answer Correct Answer: D) Eurythermal, stenothermal. 34. What is the difference between the biotic and abiotic factors? A) Biotic factors are living things and abiotic factors are nonliving things. B) Biotic factors are nonliving things and abiotic factors are living things. C) All the above. D) None of the above. Show Answer Correct Answer: A) Biotic factors are living things and abiotic factors are nonliving things. 35. To fully understand a plant or animal population, researchers need to know the population's ..... the number of males and females of each age a population contains. A) Density and distribution. B) Survivorship curve. C) Birth rate. D) Age structure. Show Answer Correct Answer: D) Age structure. 36. Which of the following best describes a population? A) All the organisms of a certain species in a given area. B) All the organisms in a habitat that compete for resources. C) One individual and all the organisms on which it depends. D) All of the living organisms which can be found in an area. Show Answer Correct Answer: A) All the organisms of a certain species in a given area. 37. All of the following are examples of living things interacting with each other EXCEPT- A) Birds preying on insects living in the grass. B) Squirrels spreading the seeds of trees by burying them. C) Frogs sleeping in the mud at the bottom of the pond. D) Fish eating plants and other smaller fish. Show Answer Correct Answer: C) Frogs sleeping in the mud at the bottom of the pond. 38. Siblings trying to seek the attention of their parents or grandparents is an example of A) Dependent interaction. B) Competitive interaction. C) Organism. D) None of the above. Show Answer Correct Answer: B) Competitive interaction. 39. Lizards and cacti are BIOTIC factors in a desert ecosystem. Which ABIOTIC factors do they depend on? A) Insects and sun. B) Water and insects. C) Snakes and temperature. D) Water and soil. Show Answer Correct Answer: D) Water and soil. 40. Ever since the Industrial Revolution, human population has generally: A) Remained the same. B) Increased. C) Decreased. D) Ecology. Show Answer Correct Answer: B) Increased. 41. Ecology is basically concerned with four levels of biology organizations. These levels are- A) Organisms, populations, communities and biomes. B) Organisms and communities, species and population. C) Species, populations, biomes and organisms. D) Organisms, populations, biomes and species. Show Answer Correct Answer: A) Organisms, populations, communities and biomes. 42. Which of the following shows an ABIOTIC factor interacting with a BIOTIC factor in the environment? A) Gypsy moth caterpillars eat the leaves of apple trees. B) Water temperature affects its oxygen level. C) Lamprey eels survive by attaching themselves to trout. D) Low light intensity affects the growth of forest pine trees. Show Answer Correct Answer: D) Low light intensity affects the growth of forest pine trees. 43. A self-contained living thing A) Competition. B) Population. C) Organism. D) Ecosystem. Show Answer Correct Answer: C) Organism. 44. Scenario:Rabbits eat plants.Rabbits (organism) and plants (factor) have what type of relationship? A) Competitive. B) Dependent. C) Ecosystem. D) None of the above. Show Answer Correct Answer: B) Dependent. 45. Which of the following accounts for the formation of major biomes? A) Annual variations in intensity of temperature. B) Annual variations in intensity and duration of temperature. C) Annual variation in precipitation. D) B and c. Show Answer Correct Answer: D) B and c. 46. A dog is an example of a(n) A) Ecosystem. B) Abiotic factor. C) Dependent interaction. D) Biotic factor. Show Answer Correct Answer: D) Biotic factor. 47. An organism's place in the biotic environment and its role in an ecosystem is A) Niche. B) Habitat. C) Epitope. D) Habit. Show Answer Correct Answer: A) Niche. 48. The interaction found between sea anemone and clown fish is A) Predation. B) Mutualism. C) Commensalism. D) Competition. Show Answer Correct Answer: C) Commensalism. 49. What does an ecosystem consist of? A) All of the biotic organisms. B) All of the abiotic organisms. C) All of the biotic and abiotic things. D) Only biotic organisms. Show Answer Correct Answer: C) All of the biotic and abiotic things. 50. Synecology is study of inter-relationship between an environment and A) A community. B) Individual plant. C) A population. D) Individual animal. Show Answer Correct Answer: A) A community. 51. Which of the following is an ABIOTIC factor that could affect BIOTIC factors? A) Number of herbivores. B) Population of rabbits. C) Length of daylight. D) Presence of harmful bacteria. Show Answer Correct Answer: C) Length of daylight. 52. An organisms in an environment is a ..... A) Abiotic factor. B) Biotic factor. C) All the above. D) None of the above. Show Answer Correct Answer: B) Biotic factor. 53. A population has more young individuals compared to the older individuals. What would be the status of the population after some years? A) It will decline. B) It will srabilize. C) It will increase. D) It will first decline and then stabilise. Show Answer Correct Answer: C) It will increase. 54. The growth rate of a local population is dependent on the birth rate minus the death rate and ..... A) The ratio of males to females in the population. B) The lifespan of females beyond the reproductive age. C) The amount of genetic variation that exists in the pop. D) The immigration and emigration of the population. Show Answer Correct Answer: D) The immigration and emigration of the population. 55. Fish dying when the temperature goes too high is an example of ..... A) An abiotic factor limiting a biotic factor. B) A biotic factor limiting a biotic factor. C) A biotic factor limiting an abiotic factor. D) An abiotic factor limiting an abiotic factor. Show Answer Correct Answer: A) An abiotic factor limiting a biotic factor. 56. What will happen if a factor that a species is dependent on decreases? A) The species will also decrease. B) The species will increase. C) Nothing. D) None of the above. Show Answer Correct Answer: A) The species will also decrease. 57. Vertical distribution of different species occupying different levels in a biotic community is known as: A) Zonation. B) Divergence. C) Pyramid. D) Stratification. Show Answer Correct Answer: D) Stratification. 58. Black walnut trees produce a nontoxic chemical that becomes highly toxic when it is exposed to air or soil. How does this chemical help black walnut trees compete with plants growing nearby? A) By attracting herbivores to the other plants. B) By limiting the amount of water available to the other plants. C) By increasing the photosynthesis rates in the other plants. D) By suppressing the growth of the other plants. Show Answer Correct Answer: D) By suppressing the growth of the other plants. 59. Which of these is an example of one living thing depending on another living thing? A) Cat walking on the sand. B) Bird building a nest in a tree. C) Dog warming in the sunlight. D) Squirrel drinking water. Show Answer Correct Answer: B) Bird building a nest in a tree. 60. Living, or produced by living things A) Population. B) Competition. C) Abiotic. D) Biotic. Show Answer Correct Answer: D) Biotic. Next →Related QuizzesScience QuizzesClass 12 QuizzesClass 12 Biology Chapter 13 Organisms And Populations Quiz 2Class 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