1) What defines a population? a) Same species, area b) Different species, area c) Same species, different areas 2) What is population growth? a) Decrease in size b) An increase in population size when more individuals are added than removed. c) Stable size 3) What causes population decrease? a) Equal added and removed individuals b) More added individuals than removed c) when more individuals are removed than added. 4) What is immigration? a) The movement of individuals out of a population. b) The movement of individuals into a population. c) Within a population 5) What is emigration? a) The movement of individuals out of a population. b) The movement of individuals into a population. c) Within a population 6) What does birth rate indicate? a) The number of individuals that die in a population. b) The number of new individuals born in a population. c) Individuals that leave 7) What does death rate indicate? a) Individuals that leave b) The number of new individuals born in a population. c) The number of individuals that die in a population. 8) What is carrying capacity? a) The maximum number of individuals an environment can support. b) Min individuals supported in an environment  c) Average individuals supported 9) What is a population crash? a) The number of individuals that die in a population b) A sudden decrease in population size due to disasters, harsh weather, or new predators. c) Stable population 10) What is a limiting factor? a) Decreases min size b) Increases population to max size c) Anything that keeps a population below its maximum size. 11) What are abiotic factors? a) Non-living parts of the environment such as water, sunlight, temperature, soil, nutrients, and space. b) Living interactions c) Both living and non-living 12) What are biotic factors? a) Non-living parts of the environment such as water, sunlight, temperature, soil, nutrients, and space. b) Living interactions between organisms, such as competition and cooperation. c) Both living and non-living 13) What is competition? a) When organisms try to use the same limited resources. b) When organisms work together  c) Avoid resources 14) What is cooperation? a) Avoid resources b) Use same resources c) When individuals work together to survive and get resources. 15) A population grows when: a) A. More individuals die than are born b) B. Individuals leave the population c) C. More individuals are added than removed d) D. Resources decrease 16) Which process adds individuals to a population? a) A. Emigration b) B. Death c) C. Immigration d) D. Competition 17) A population gets smaller when: a) A. Birth rate is higher than death rate b) B. Death rate is higher than birth rate c) C. Resources increase d) D. Cooperation increases 18) Immigration means: a) A. Leaving a population b) B. Joining a population c) C. Death of organisms 19) When a bird leaves Population A and joins Population B, the bird is: a) A. Immigrating to A b) B. Emigrating from B c) C. Emigrating from A and immigrating to B 20) The size of a population depends mainly on: a) A. Minimum population size b) B. Maximum population an environment can support c) C. Number of predators 21) After a rainy season, plant growth increases. What may happen to herbivores? a) A. Population decreases b) B. Population stays the same c) C. Population grows 22) A limiting factor: a) Helps population grow faster b) Has no effect on population c) Keeps population size below its full potential 23) Which is an abiotic factor? a) A. Predators b) B. Plants c) C. Water 24) Which is a biotic factor? a) A. Sunlight b) B. Temperature c) C. Soil d) D. Competition 25) Competition occurs when: a) A. Organisms cooperate b) B. Resources are unlimited c) C. Organisms use the same limited resource 26) Competition can happen: a) A. Only between different species b) B. Only within a population c) C. Within and between populations 27) Cooperation helps populations because it: a) A. Reduces resources b) B. Helps individuals survive and get resources c) C. Causes population crashes 28) A population crash may occur due to: a) A. Increased cooperation b) B. Natural disasters c) C. Increased food supply 29) How can we determine if a population is increasing or decreasing? a) A. By counting the number of predators b) B. By comparing the number of births to the number of deaths c) C. By measuring the size of the habitat 30) Compare immigration and emigration: how can each affect population size? a) A. Immigration decreases population; emigration increases population b) B. Immigration and emigration have no effect on population size c) C. Immigration adds individuals; emigration removes individuals 31) What would happen to the carrying capacity of a population during a natural disaster? a) A. It would increase b) B. It would stay the same c) C. It would suddenly decrease 32) Which is an example of cooperation between individuals in a population? a) A. Animals fighting over food b) B. Animals hunting together in groups c) C. Animals competing for shelter 33) A population has a high birth rate, but its size does not increase. What is the MOST likely reason? a) A. Immigration is high b) B. Death rate is also high c) C. Carrying capacity increased 34) If a new predator enters an ecosystem, what will MOST LIKELY happen to the prey population first? a) A. Immediate population growth b) B. Increase in immigration c) C. Decrease in population size 35) Which situation best shows emigration causing a population decrease? a) A. Many babies are born in a population b) B. Animals leave an area due to lack of water c) C. New animals join a habitat 36) Two different species living in the same habitat use the same food source. This is an example of: a) A. Cooperation b) B. Abiotic limitation c) C. Interspecific competition 37) A population suddenly drops far below its carrying capacity. Which event MOST likely caused this? a) A. Long rainy season b) B. Increase in food resources c) C. Natural disaster 38) Which factor would MOST likely increase a population’s carrying capacity? a) A. Drought b) B. Loss of habitat c) C. Increase in food and water 39) A population remains the same size over time. Which situation BEST explains this? a) A. Birth rate equals death rate b) B. Immigration is greater than emigration c) C. Resources are unlimited 40) Which of the following is NOT a limiting factor? a) A. Space b) B. Water c) C. Sunlight d) D. Cooperation 41) What happens when a population reaches its carrying capacity? a) A. Population grows rapidly b) B. Resources become unlimited c) C. Growth rate slows or stops 42) Which situation BEST shows cooperation helping population growth? a) A. Animals competing for food b) B. Birds migrating to a new area c) C. Wolves hunting together in a pack 43) Which change would MOST likely cause a population crash? a) A. Mild weather b) B. New food source c) C. Sudden habitat destruction 44) If emigration increases while immigration stays the same, the population will: a) A. Increase b) B. Decrease c) C. Stay constant 45) The population stays at about the same size if the number of individuals that are added is ............ the number of individuals that are removed. a) close to  b) less than c) More than 46) Which of the following consists of all the individuals of a species that live together in one place at one time? a) Population b) Culture 47) The number of individuals in a specific population is called which of the following? a) Population model  b) Population density c) Population growth d) Population size 48) The number of people that live in a given area is called which of the following? a) Population growth b) Population density c) Population model 49) How can we determine whether a population is increasing or decreasing? a) A. By measuring the habitat size b) B. By comparing birth rate and death rate c) C. By counting the number of predators 50) What is MOST likely to happen to a population after a rainy season? a) A. Carrying capacity decreases due to flooding b) B. Resources increase, allowing population growth c) C. Population crashes immediately 51) Which of the following is an example of cooperation within a population? a) A. Animals competing for food b) B. Animals migrating due to drought c) C. Animals hunting together in groups 52) What is meant by a population crash? a) A. A slow increase in population size b) B. A sudden decrease in population due to environmental changes c) C. A population reaching carrying capacity 53) Which statement BEST explains why the carrying capacity of an environment CAN change? a) A. Carrying capacity depends only on population size b) B. Carrying capacity increases permanently over time c) C. Environmental changes affect available resources 54) A population crash occurs when the carrying capacity for a population suddenly increases. a) f b) t 55) A part of the environment that keeps a population’s size at a level below its full potential is called the determining factor. a) F b) T 56) The carrying capacity of a herbivore population will grow after a rainy season. a) F b) T 57) Limiting factors can be living or nonliving things in an environment. a) F b) T

Population Dynamics Quiz W3 GRADE 6

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