I can…explain the experiments that prove “Life comes from Life” Get out your homework to be...
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![Page 1: I can…explain the experiments that prove “Life comes from Life” Get out your homework to be checked. Write down tonight’s homework. Warm Up: What are the.](https://reader036.fdocuments.net/reader036/viewer/2022062518/56649e905503460f94b94888/html5/thumbnails/1.jpg)
I can…explain the experiments that prove “Life comes from Life”
Get out your homework to be checked.Write down tonight’s homework.
Warm Up:What are the 6 characteristics of life?
![Page 2: I can…explain the experiments that prove “Life comes from Life” Get out your homework to be checked. Write down tonight’s homework. Warm Up: What are the.](https://reader036.fdocuments.net/reader036/viewer/2022062518/56649e905503460f94b94888/html5/thumbnails/2.jpg)
Life Comes from life• Living things arise from living things through
reproduction
• ….But, four hundred years ago people believed that life could appear from nonliving things… CRAZY!?!?!
• They called this… SPONTANEOUS GENERATION***the mistake idea that living things can arise from nonliving sources
http://www.youtube.com/watch?v=WNByRghR6sw
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Redi’s Experiment
• Francesco Redi – Italian doctor (1600’s)
• He designed a CONTROLLED EXPERIMENT to show flies do not arise from decaying meat
• Who remembers what a controlled experiment is???• A scientist carries out 2 tests that are identical in
every respect except for one factor
![Page 4: I can…explain the experiments that prove “Life comes from Life” Get out your homework to be checked. Write down tonight’s homework. Warm Up: What are the.](https://reader036.fdocuments.net/reader036/viewer/2022062518/56649e905503460f94b94888/html5/thumbnails/4.jpg)
Redi’s Experiment
• Left jar = UNCOVERED• Right jar = COVERED
• Manipulated Variable?• Whether or not the jar Was covered
![Page 5: I can…explain the experiments that prove “Life comes from Life” Get out your homework to be checked. Write down tonight’s homework. Warm Up: What are the.](https://reader036.fdocuments.net/reader036/viewer/2022062518/56649e905503460f94b94888/html5/thumbnails/5.jpg)
Pasteur’s experiment• Louis Pasteur--- French chemist (mid-1800s)
• Some people still did not believe Redi… so Pasteur came up with a new experiment
• His experiment… demonstrated that new bacteria appeared in broth only when they were produced by existing bacteria
• Both experiments convinced people that LIVING THINGS DO NOT ARISE FROM NONLIVING MATERIAL
![Page 6: I can…explain the experiments that prove “Life comes from Life” Get out your homework to be checked. Write down tonight’s homework. Warm Up: What are the.](https://reader036.fdocuments.net/reader036/viewer/2022062518/56649e905503460f94b94888/html5/thumbnails/6.jpg)
Pasteur’s experiment
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Chapter 2: Living ThingsSection 1, Part 2
![Page 8: I can…explain the experiments that prove “Life comes from Life” Get out your homework to be checked. Write down tonight’s homework. Warm Up: What are the.](https://reader036.fdocuments.net/reader036/viewer/2022062518/56649e905503460f94b94888/html5/thumbnails/8.jpg)
The needs of living things
• All living things need -----
•Water• Food• Living space• Stable internal conditions
![Page 9: I can…explain the experiments that prove “Life comes from Life” Get out your homework to be checked. Write down tonight’s homework. Warm Up: What are the.](https://reader036.fdocuments.net/reader036/viewer/2022062518/56649e905503460f94b94888/html5/thumbnails/9.jpg)
water
• All living things NEED WATER TO SURVIVE.
• WHY? Organisms need water to…• Obtain chemicals from their
surroundings• Break down food• Move substances within their bodies• Reproduce
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Food• Organisms use FOOD AS THEIR ENERGY SOURCE.• Plants: Capture the sun’s energy and use it for food• Organisms that make their own food are called
AUTOTROPHS• Examples: grass, moss, algae, trees,
flowers…• Organisms that CANNOT make their own food are
called HETEROTROPHS• Examples: animals, mushrooms,
and slime molds…
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Living space
• All organisms need a place to live• Its surroundings MUST PROVIDE WHAT IT NEEDS
TO SURVIVE• How do trees compete for space?
• Top of the trees for SUNLIGHT• Below the ground for WATER AND
NUTRIENTS
•Come up with an example on your own!
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Stable internal conditions• Organisms must be able to keep conditions
inside their bodies STABLE, EVEN WHEN CONDITIONS IN THEIR SURROUNDINGS CHANGE SIGNIFICANTLY.
•This is called….. HOMEOSTASIS
• Example: Your body temperature stays steady even when there are changes in air temperature.