Ecology%20Worksheet - PowerPoint PPT Presentation

View by Category
About This Presentation
Title:

Ecology%20Worksheet

Description:

Ecology Worksheet Chapters 5 and 6 1 ... tens of thousands of years,the human population grew very ... of individuals per unit area. 3) What can affect population ... – PowerPoint PPT presentation

Number of Views:75
Avg rating:3.0/5.0
Slides: 19
Provided by: lradolins
Learn more at: http://www.cityschools.com
Category:

less

Write a Comment
User Comments (0)
Transcript and Presenter's Notes

Title: Ecology%20Worksheet


1
Ecology Worksheet
  • Chapters 5 and 6

2
1) Name the 3 important characteristics of a
population
  • Geographic distribution
  • Density
  • Growth rate

3
2)__________of the of individuals per unit area.
  • Population density

4
3) What can affect population density?
  • Species
  • ecosystem

5
4) What factors can affect population size?
  • Number of births
  • Number of deaths
  • Number of individuals that enter or leave a
    population

6
5) Compare immigration and emigration.
  • Immigration is the movement of individuals into
    an area and emigration is movement OUT OF an
    area. Immigration can cause a population to grow
    while emigration can cause a population to
    decrease .Searching for mates ,changes in
    resources and food can affect both.

7
6) What is exponential growth?
  • Occurs when the individuals in a population
    reproduce _at_ a constant rate._at_ first they
    increase slowly , but eventually they increase
    approaching an indefinitely large sizeThis is in
    the absence of predation and presence of
    unlimited resources

8
7)When will a population grow exponentially?
  • Under ideal conditions with unlimited resources

9
8)What is logistic growth and how does that
differ from exponential growth?
  • As resources become less available,the growth
    slows or stops.This generally is an s-shaped
    curve.and occurs following a time of exponential
    growth---Exponential growth occurs _at_ ideal
    conditions only.

10
9) Define carrying capacity.
  • The largest number of individuals that a given
    environment can support

11
10) What factors may cause carrying capacity to
change?
  • Natural disasters,resources limited..

12
11)Do analyzing data on p. 123
2) Logistic growth in fruit fly population and
exponential growth in rabbits .Limiting factors
must have affected fruit fly population, but not
rabbits. 3)The graph of fruit flies seems to have
reached carrying capacity _at_ 35 days,where 320
individuals are supported. 4)w/ predators
added,the rabbits would show logistic growth,and
population would slow or decrease
13
12. What are limiting factors and give examples.
  • Can cause a population growth to
    decrease----eg.-human disturbances,drought and
    other climate extremes,parasitism and
    disease,predation,competition

14
13)List 3 density dependent factors and 3
density-independent factors.
  • Density dependentcompetition,predation
    parasitism and disease(are dependent on
    population)
  • Density independent unusual weather,natural
    disasters,seasonal cycles,human activities

15
14) How do competition and population size relate?
  • When populations become larger and more
    crowded,organisms must compete w/one another for
    food,water,space,sunlight,and other essential
    resources.

16
15) If an entire fox population disappears ,what
is likely to happen to the rabbit population?
  • Explosive growth

16)Do 4 and 5 from 127
4prolonged drought-could cause death from crop
loss and emigration 5--- natural disasters could
decrease human and other organisms populations
17
17-Do 1 and 3 on p.132Do 1-5 on p.149
  • 1-over tens of thousands of years,the human
    population grew very slowly.Then , about 5oo
    years ago it began to grow exponentially and
    still increases.
  • 3-Demography scientific study of human
    populations
  • P.149
  • 1-renewable resource is able to regenerate and is
    replaceableexample water/nonrenewable cannot be
    replenished by regular processesfossil fuels,
    forests under the right context
  • 2-examplemining affecting land and air
  • 3-no one took responsibility for the resources,
    although it is used world wide
  • 4-air is breathed/wetlands filter pollutants from
    water
  • 5-example-selective cutting of trees

18
1-5 on p.156
  • 1-one of earths greatest natural resources
  • w/foods and medicines
  • 2-altering habitats, extinction and introducing
    foreign species can alter biodiversity
  • 3-protecting entire ecosystems and single species
  • 4-smaller the habitat size, the fewer the species
    living there
  • 5-each habitat is unique once destroyed or
    altered a habitat may be gone forever
About PowerShow.com