science 2.2 9/30/08 Flash Cards

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Title: science 2.2 9/30/08
Description: pearson
Number of Cards: 15
Save Count: 0
Author: lnrand11
Created: 2008-09-30
Tags: pearson success
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    • Question
    • Answer
    • Side 3
    • direct observation
    • to count all of its members
    • indirect observation
    • to observe signs of organisms rather than the organisms themselves
    • sampling
    • to count the number of organisms in a small area, and then multiply to find the number in a larger area
    • mark-and-recapture
    • to mark a number of organisms within the species, then later come back and see how many are marked and how many are not
    • How can population size change?
    • when new members immigrate or born or emigrate or death
    • immigrate
    • to move to another population
    • birthrate
    • the number of briths within a population per year
    • emigrate
    • to leave a population
    • deathrate
    • the number of deaths within a population per year
    • birthrate is greater than deathrate=
    • population increases
    • deathrate is greater than birthrate=
    • population decreases
    • population density
    • the number of individuals in a specific area
    • limiting factor
    • an environmental factor that causes a population to decrease
    • What are some limiting factors?
    • food and water, space, and weather conditions
    • carrying capacity
    • The largest population that an area can support