How Energy Flows through Living Systems

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How Energy Flows through Living Systems
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Sometimes.
Can be
LIFE
TOUGH
. . . maybe even life or death
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Scenerio
A small group of people are stranded on
a barren desert island.
They have 500 bushels of wheat and one cow. What
should they do to survive the greatest length of
time?
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• Eat the cow and then eat the wheat.
• Drink the cows milk, eat the cow, and
• then eat the wheat.
• Dont feed the cow, drink the cows
• milk, eat the cow when milk production
• stops and then eat the wheat.
• D. Feed the wheat to the cow and drink
• the milk
• E. Feed the wheat to the cow, drink the
• milk, and then eat the cow.
• F. Eat the wheat and then eat the cow.

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Think about the question yourself.
Which answers do you think are the best ones?
Which ones make the most sense?
Why?

• Eat the cow and then eat the wheat.
• Drink the cows milk, eat the cow,
• and then eat the wheat.
• Dont feed the cow, drink the cows
• milk, eat the cow when milk
• production stops and then eat the
• wheat.
• D. Feed the wheat to the cow and drink
• the milk
• Feed the wheat to the cow, drink
• the milk, and then eat the cow.
• F. Eat the wheat and then eat the cow.

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• Eat the cow and then eat the wheat.
• Drink the cows milk, eat the cow,
• and then eat the wheat.
• Dont feed the cow, drink the cows milk, eat the
  cow when milk
• production stops and then eat the
• wheat.
• D. Feed the wheat to the cow and drink the milk
• Feed the wheat to the cow, drink
• the milk, and then eat the cow.
• F. Eat the wheat and then eat the cow.

Now that you have had the opportunity to come up
with your own hypothesis, get together with the
people at your table and come up with a table
group consensus on how to survive for the longest
time.
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Table groups, now is your time to debate your
conclusion with the other table groups.
Is there a class consensus?
If so What is it?
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There are two main points to consider.
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Choices D E are not good because of the
inefficiency of energy transfer between trophic
levels

• Eat the cow and then eat the wheat.
• Drink the cows milk, eat the cow, and then eat
• the wheat.
• Dont feed the cow, drink the cows milk, eat
• the cow when milk production stops and then
• eat the wheat.
• D. Feed the wheat to the cow and drink the milk.
• E. Feed the wheat to the cow, drink the milk, and
  
• then eat the cow.
• F. Eat the wheat and then eat the cow.

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Choice F is not a good choice because it keeps
the cow alive burning off calories.

• Eat the cow and then eat the wheat.
• Drink the cows milk, eat the cow, and then eat
• the wheat.
• Dont feed the cow, drink the cows milk, eat
• the cow when milk production stops and then
• eat the wheat.
• D. Feed the wheat to the cow and drink the milk.
• E. Feed the wheat to the cow, drink the milk, and
  
• then eat the cow.
• F. Eat the wheat and then eat the cow.

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The best choices are A B.
Choice A allows for the
consumption of the cows energy
before much of it is wasted by
the cows metabolism. Choice B is similar, but it
allows for the harvesting of the energy in the
cows milk. It may be a better choice than A if
the cow is milked right away. But if the cow
continues to produce milk over time (Choice C) it
will waste energy in the process.

• Eat the cow and then eat the wheat.
• Drink the cows milk, eat the cow, and then eat
• the wheat.
• Dont feed the cow, drink the cows milk, eat
• the cow when milk production stops and then
• eat the wheat.

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Most life forms on earth get their energy from
the sun. Plants use photosynthesis to capture
sunlight, and herbivores eat those plants to
obtain energy. Carnivores eat the herbivores, and
decomposers digest plant and animal matter.
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Its All About Energy
. . . in other words
Its about getting the energy from the sun and
converting it into a form that we can use.
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Its All About Energy!
or adenosine (uh DEHN uh seen) triphosphate, is a
single nucleotide specialized for storing-energy.
When food molecules are broken down inside cells,
the energy in the molecules is stored in ATP.
Cells need a steady supply of ATP to function.
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Read
About
. . . and then answer the questions on the
right side of the paper
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take 10 minutes to use the information in the
left column of your handout (and your
understanding of biology) to answer the questions
on the right.
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Group Time
Now lets take 5 minutes to compare your findings
with your shoulder/table partners
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Green Plants
Some Protists
6 CO2 and 6 H2O Carbon dioxide
Water
C6H12O6 and 6 O2 Glucose
Oxygen
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Leaves
Chloroplasts
Autotrophs
Producers
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The process cells use to break down glucose into
ATP (energy) the cells can use.
C6H12O6 and 6 O2 Glucose
Oxygen
6 CO2 and 6 H2O Carbon dioxide
Water
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ATP
Money
Mitochondria
It allows them to convert the
glucose produced during photosynthesis into ATP
(energy) the cells need.
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When you break it down into its simplest form,
Water energy and gas come in during
photosynthesis
and are released by
cellular respiration
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If you stop to think about it, cellular
respiration the exact opposite of photosynthesis.
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Use your understanding of Photosynthesis and
Cellular Respiration to create a T-Chart
comparing the two pathways
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Which cellular organelle is responsible for
photosynthesis?
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Which cellular organelle is responsible for
cellular Respirations?
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Photosynthesis takes place in _____. A.
Plants B. Animals C. Both
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Cellular Respiration takes place in takes place
in _____. A. Plants B. Animals C.
Both
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• Which of the following best describes the part of
  the bioenergetics pathway shown below.
• C6H12O6 6O2
• It represents the reactants of photosynthesis
• B. It represents the reactants
• of cellular respiration.
• C. Both

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Which cellular organelle is responsible for
photosynthesis?
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Which cellular organelle is responsible for
cellular Respirations?
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Photosynthesis takes place in _____. A.
Plants B. Animals C. Both
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Cellular Respiration takes place in takes place
in _____. A. Plants B. Animals C.
Both
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• Which of the following best describes the part of
  the bioenergetics pathway shown below.
• C6H12O6 6O2
• It represents the reactants of photosynthesis
• B. It represents the reactants
• of cellular respiration.
• C. Both