Transcript Population Change notes

Bell ringer 9/17/14
Write the question, answer,
and justify!
Bell ringer 9/17/14
Objectives
State Performance Indicators:
• SPI 0807.5.2 - Analyze structural, behavioral, and physiological adaptations to predict which
populations are likely to survive in a particular environment
• SPI 0807.5.3 - Analyze data on levels of variation within a population to make predictions about
survival under particular environmental conditions.
• SPI 0807.5.4- Analyze data on levels of variation within a population to make predictions about
survival under particular environmental conditions.
TOC:
# 27 : Changes over Time (Environment and Adaptations)
# 28: Adaptations Gallery Walk
Environments always change over time
 They change seasonally and sometimes for other reasons
 So organisms must also change in order to survive
 One reason that environments change is due to the movement
of tectonic plates
Example: Antarctica is very cold and
icy today since it is at the south pole.
Yet millions of years ago Antarctica was
further north and had a warm climate.
It moved south riding on a tectonic plate.
As it moved the environment became colder.
As the environment became colder, the
plants and animals there had to adapt or die.
Notice that it is
moving southward
Antarctica
Antarctica
Environments always change over time
 Another reason that environments change is due to the way the
Earth orbits (revolves) the sun
Example: In reoccurring cycles lasting thousands to millions of years, the Earth
wanders either a bit further away or a bit closer to the sun as it orbits the sun.
When Earth orbits closer to the sun, the entire planet is warmer. When Earth orbits
farther away from the sun, the entire planet gets colder.
As the planet becomes hotter or colder, plants and animals must adapt or die.
Earth
As the distance increases or
decreases between the Earth
and the Sun, Earth becomes
colder or hotter.
Sun
Environments always change over time
 Another reason for this change is due to catastrophic events
like volcanoes and/or objects striking the planet from space.
Example: Volcanic eruptions can throw tons and tons of rock dust and smoke into the
atmosphere creating gigantic clouds that block sunlight making the Earth colder.
Example: When large asteroids strike the Earth, rock is pulverized and similar to
volcanic eruptions, tons of rock dust is thrown up into the atmosphere. These dust
clouds block sunlight causing our planet to become colder
Environments always change over time
 So organisms, both plants and animals, must also change
 Changing is called adapting (also called adaptation)
 If an organism can not adapt to environmental changes they die
 If too many of the organisms die, then the entire species will
go extinct
Three types of adaptations that organisms must make in order
to survive :
(1) Behavioral- (what an organism does)
(2) Structural- (what an organism is…shape & form of the body)
(3) Physiological-(adaptations that deal with the internal body make-up that aid
in body functions to help in survival. )
Elbow partners:
Decide whether each scenario at your group is
behavioral, structural, or physiological
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Adaptations: Structural (c), Behavioral (B), or Physiological (P)
S 1. Insects have a very light external covering, called an
exoskeleton, to support and protect their body.
P 2. Some mammals have special light receptive cells that can see
in color.
S 3. Cows have five stomachs to hold the grass longer to aid in
digestion of the grass.
P 4. Plants have green chlorophyll, a chemical that is used in
photosynthesis.
B 5. Limpets can move on the underside of the rocks at low tide.
B 7. Deer can run fast.
S 8. Plants have leaves that are thin, flat structures to absorb light.
P 9. Seaweeds have a brown chemical that helps absorb light from
underwater.
S 10. Polar bear’s blubber allow it to stay warm in frigid
temperatures.
S 11. Snake scales aid in the heat and dryness of the desert which
keeps water from escaping through its skin.
B 12. Opossums play dead when in danger.
TOC # 28 : Adaptations
Gallery Walk
• You will need to write your answers on a piece of loose leaf
notebook paper.
• You are going to complete a Gallery Walk to review
adaptations. You need to number your paper #1-8 skipping 2
lines between each number.
• You will go from table to table. You cannot get out of order.
Make sure to put your answer by the corresponding number
where you are.
• This is an individual activity to assess yourself. Please do not
talk to your team mates at your groups.
• You will ONLY have 1 minute per question. Please move when
the buzzer sounds.
• You MUST JUSTIFY each answer!
#1
#2
#3
#4
#5
#6
#7
#8
EXIT TICKET
• Write down a question
you still have about
adaptations and survival
or something you
learned today,