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# Population Dynamics Q And A

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• 1. Characteristics of Population--Population Size
• The number of individuals in the population is the population’s size.
• If a population is small and made up of organisms that do not move, the size can be determined by counting the individuals .
• Usually individuals are too widespread or move around too much to be counted. The population size then is estimated.
• 2.
• The size of human population is increasing each year.
• The size of a population is always changing. The rate of change in population size varies from population to population.
• 3. Population Density
• The number of individuals in a population that occupy a definite area is called population density .
• When more individuals live in a given amount of space the population is more dense.
• 4. Population Spacing
• Another characteristic of populations is spacing, or how the organisms are arranged in a given area.
• They can be evenly spaced, randomly spaced, or clumped together.
• 5. Limiting Factors
• All ecosystems have a limited amount of food, water, living space, mates, nesting sites, and other resources.
• A limiting factor is any biotic or abiotic factor that limits the number of individuals in a population.
• 6. Limiting Factors
• Competition is the struggle among organisms to obtain the same resources needed to survive and reproduce.
• As population density increases, so does competition among individuals for the resources in their environment.
• 7. Carrying Capacity
• Carrying capacity is the largest number of individuals of a species that an environment can support and maintain for a long period of time.
• If a population gets bigger than the carrying capacity of the environment, some individuals are left without adequate resources.
• 8. Biotic Potential
• The maximum rate at which a population increases when plenty of food and water are available, the weather is ideal, and no diseases or enemies exist, is its biotic potential.
• Most populations never reach their biotic potential, or they do so for only a short period of time.
• Eventually, the carrying capacity of the environment is reached and the population stops increasing.
• 9. Symbiosis and Other Interactions
• Symbiosis (sihm bee OH sus) is any close interaction between two or more different species.
• Mutualism is a symbiotic relationship in which two different species of organisms cooperate and both benefit.
• 10. Symbiosis and Other Interactions
• Commensalism is a form of symbiosis that benefits one organism without affecting the other organism.
• Parasitism is a symbiotic relationship between two species in which one species benefits and the other species is harmed.
• 11. Predation
• Predation is the act of one organism hunting, killing, and feeding on another organism.
• Owls are predators of mice.
• Mice are their prey.
• 12. Predation
• Predators are biotic factors that limit the size of the prey population.
• Availability of prey is a biotic factor that can limit the size of the predator population.
• 13. Habitats and Niches
• The role, or job, of an organism in the ecosystem is called its niche (NICH).
• What a species eats, how it gets its food, and how it interacts with other organisms are all parts of its niche.
• The place where an organism lives is called its habitat .
• 14. True or False Change to Make True 1. Predators are abiotic factors that limit the size of prey populations 3. An ecosystem is a large region with plant and animal groups well adapted to the soil and climate of the region 4. The number of individuals living in a definite area is called population spacing F biotic 2. Groups of populations that interact with each other in s given area form a community True F biome F density
• 15. Completion 5. Environmental factors that include soil, sunlight, air ______ 6. Made of overlapping food chains ___________ food web population 7. Number of one species in an area _________ 8. Sometimes environmental factors reach a carrying ___________ capacity abiotic
• 16. Completion 9. A relationship in which one species benefits at the expense of another ________ 10. Role of an organism in an ecosystem niche parasitism
• 17. Completion select best choice 11. Groups of populations that interact with each other in a given area form a__________ community , niche 12. The struggle among organisms to obtain resources for reproduction and survival is called ___________ competition , capacity
• 18. Completion select best choice 13. A symbiotic relationship that benefits both species is called __________ commensalism, mutualism 14. The physical location where an organism lives is its ______ habitat ,population
• 19. Matching A. Living things grow and develop A B. Living things respond C. Living things maintain homeostasis D. Living things use energy E. Living things are organized F. Living things reproduce F 15. __ The fish in the classroom aquarium have baby fish 16. __ Your neighbor’s puppy has grown into a large dog 17. __ Your friend has 2 brothers and a sister F
• 20. Match each item with the correct statement A. Ecology B. Limiting factor C. Carrying capacity Producers E. Nitrogen fixation F. Energy G. Biotic factors Predation I. Air J. Abiotic factors K. Mutualism L. Water 18. ___ symbiotic relationship that benefits both species 19. ___ living organisms 20. ___ limits the number of organisms in an environment D. H. D. D. D. K G B
• 21. Match each item with the correct statement A. Ecology B. Limiting factor C. Carrying capacity Producers E. Nitrogen fixation F. Energy G. Biotic factors Predation I. Air J. Abiotic factors K. Mutualism L. Water 21. ___ The 1 st level of the food chain 22. ___ One organism kills and feeds on another organism. 23. ___ the largest number of organisms that an environment can support and maintain D. H D. D. D C
• 22. Match each item with the correct statement A. Ecology B. Limiting factor C. Carrying capacity D. Biotic factors E Predation 24.___number of individuals in a population 25.___number of individuals that occupy a definite area population 28 ___ arrangement of organisms in an area E C A 26.___maximum rate of population increase 27.___reduces the number in the population D B