Biology chapter 4 Persuasive Essay – Flashcards
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if bacteria divide at the rate they do, why dont they take over the worl
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beacuse of the limiting factors- water, food, nutrients, and space
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whats is a population
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a group of organsims all the same species that interbreed and live in the same place at the same time
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what is population growth
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the increase in size of the population over time
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what is one method of studying population changes
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intoduicng organisms to a controlled enviorment with abundent resources and watching how they react
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what is required to study larger populations
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ratio moniters
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what are the two types of life history patterns
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slow and rapid
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what are 3 characteristics of slow life history
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reproduce slowly, few offspring, long gestation period, mature slowly, long lives, maintain population, population size at or near carry capacity
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name 3 characteristics of rapid life history
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reproduce early and rapidly, many offspring at once, small body size, mature rapidly, short life span, populations increase rapildy, then decline when enviormentqal conditions change and become unsitable for life such as insects or bacteria
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what are the three types od dispersal patterns
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random, inoform, and clumping
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what are examples of the three types of dispersals
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flowers/random trees/uniform musgrooms/clumping
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what are the 2 limiting fctors of dispersal
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1. density dependent 2. density independent
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what is population density
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refers to the number of individuals in an area
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what are some examples of density dependent
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disease, competition, predators, parasites, food
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what are some examples of density independent
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volcanic eruptions, temperature, natural disaters, chemical pesticides. and major habitat destruction
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what are the 3 limiting factors of population size
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predation, crowding, competiton
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what are 4 negative effects on an organism due to crowding
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decreased fertility, decreased parental care, aggresion, and descreased resistance to disease
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why dont populations of organisms grow indefinatly
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limiting factors
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what is carrying capacity
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the number of organisms of one species that an enviorment can support
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if the number of organisms in a population is _______ the enviorments carrying capacity, births _______ deaths and the population ______
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under, exceeds, grows
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if the number of organisms rises ________ the carrying capacity of the enviorment,_______ will exceed _______
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above, deaths, births
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the most important factor that determines population growth is the organisms
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reproductive pattern
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organisms that follow a rapid life history pattern have short life spans, small bodies, and reproduce early
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true
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what is a limiting factor that has an increasing effect as population size increases is
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competition
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what symptoms can cause a decrease in a population
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aggression, decrease in parental care, decreased fertiltiy, decreased resistance to disease, overcrowding
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what is life expectancy
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how long an average person is expected to live
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what is fertility rate
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the rate at which fertility occurs
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what is migration
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instinctive seasonal movements of animals from place to place
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what is immagration
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movements of individials
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what is emigration
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movement of a population
