Chapter 5 Biology

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What are the 3 most important characteristics of a population?

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1

What are the 3 most important characteristics of a population?

  • geographic distribution

  • population density

  • growth rate

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2

Geographic distribution-

amount in an area

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3

Population Density-

number of individuals per unit area

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4

Growth Rate-

number of individuals either increasing or decreasing

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5

What are the three factors that can affect population size?

  • Number of Births

  • Number of Deaths

  • Movement

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6

What is the difference between Immigration and Emigration?

I- moving in E- moving out

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7

Exponential Growth

Increasing at a constant rate

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8

Logistic Growth

follows S shaped line

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9

Carrying Capacity

largest # of individuals it can hold

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10

Limiting Factor-

causes population growth to decrease

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11

What is the difference between Density Dependent and Independent

  • give one example for each

DD- depends on population size EX: Competion DI- doesn´t depend on population size EX: Weather

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12

competition

fighting for resources

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13

Predation

predator - pray relationship

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14

parasitism

parasite attacking host

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15

Disease

out of homeostasis

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16

What went wrong with DDT?

harming eagles eggs

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17

What happened with the Asian Beetles?

made ladybugs endangered

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18

biosphere

where all life exists

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19

Demography

scientific study of human populations

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20

TRUE OR FALSE: Birthrates, death rates, and the age structure of a population help predict why some countries have high growth rates while others don´t

TRUE

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21

Demographic transition

change in births and deaths

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22

TRUE OR FALSE: Current projections suggest that by 2050 our population will reach 40 billion

FALSE (projections at 10 billion)

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23

TRUE OR FALSE: Human behaviors have affected the biosphere

TRUE

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24

What has hunting and gathering caused

mass extinctions

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25

What are mass extinctions

many animals are killed at one time

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26

What is farming

growing organism for food or profit

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27

What did agriculture lead to

government, laws, and writing

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28

What is monoculture

planted with same crop year after year

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29

Green Revolution

using resources which great;ly increase the world´s food supply

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30

What does the increase in the food supply that increases pests lead to?

pollution

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31

what are fossil fuels

coal, oil, natural gas

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32

Renewable resources

can get back in lifetime

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33

Nonrenewable resources

can´t get back in our lifetime

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34

Sustainable Development

way of using natural resources without depleting them

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35

Erosion

moving sediment

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36

Weathering

breaking down rocks and soils

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37

Desertification

turning productive areas into less productive areas

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38

Deforestation

loss of trees

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39

Aquaculture

raising aquatic animals for food

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40

Smog

mixture of chemicals haze in atmosphere

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41

Pollutant

harmful material

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42

What are the wetland factors

  • habitat

  • filters water

  • control water volume

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43

biodiversity

amount of species in an area

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44

Species defintion

group of organisms that can reproduce

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45

Extinction

species disappears from all or part of its range

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46

endangered

risk of extinction

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47

Biological Magnification

pollutant gets worse at higher tropic level

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48

Invasive species

new species that takes over

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49

conservation

trying to save

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50

Ozone layer

layer of O3 in atmosphere

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51

What is something good about the ozone layer

absorbs UV radiation

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52

What is the difference between global warming and greenhouse gases

Global warming- humans greenhouse gases- natural

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