1. How Energy Flows through Living Systems

2. . . . maybe even life or death
Sometimes.
Can be
LIFE
TOUGH
. . . maybe even life or death

3. 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?

4. Eat the cow and then eat the wheat.
Drink the cows milk, eat the cow, and
then eat the wheat.
Don’t 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.

5. 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.
Don’t 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.

6. Eat the cow and then eat the wheat.
Drink the cows milk, eat the cow,
and then eat the wheat.
Don’t 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.

7. 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?

8. There are two main points to consider.
Solution
There are two main points to consider.
If the cow is alive it is going through metabolism, converting organic molecules into waste products, ATP and heat. These energy conversions reduce the cows energy value to the people.
1st
Energy transfer from one trophic level to another to another is extremely inefficient. If the cow eats the wheat, then much of the energy from the wheat will be lost as heat and cow feces and will be unusable to the people
2nd

9. Solution
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.
Don’t 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.

10. Solution
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.
Don’t 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.

11. Solution 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 cow’s 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.
Don’t feed the cow, drink the cows milk, eat
the cow when milk production stops and then
eat the wheat.

12. Most life forms on earth get their energy from the sun
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.

13. . . . in other words Its All About Energy
Its about getting the energy from the sun and converting it into a form that we can use.

14. It’s All About Energy! AT P
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.

15. Read
About:
. . . and then answer the questions on the right side of the paper

16. Time
Solo
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.

17. Group
Time
Now lets take 5 minutes to compare your findings with your shoulder/table partners

18. Green Plants Some Protists 6 CO2 and 6 H2O C6H12O6 and 6 O2
Carbon dioxide & Water
C6H12O6 and O2
Glucose & Oxygen

19. Leaves
Chloroplasts
Autotrophs
Producers

20. The process cells use to break down glucose into ATP (energy) the cells can use.
C6H12O6 and O2
Glucose & Oxygen
6 CO and 6 H2O
Carbon dioxide & Water

21. ATP
Money
Mitochondria
It allows them to convert the glucose produced during photosynthesis into ATP (energy) the cells need.

22. When you break it down into its simplest form, Water energy and gas come in during photosynthesis
and are released
by cellular respiration

23. Photosynthesis Cellular Respiration
6CO2 + 6H2O  C6H12O6 + 6O2  6CO2 + 6H2O +
Photosynthesis
Cellular Respiration
AT P

24. Photosynthesis Cellular Respiration
If you stop to think about it, cellular respiration the exact opposite of photosynthesis.
Photosynthesis
Cellular Respiration

25. Use your understanding of Photosynthesis and Cellular Respiration to create a T-Chart comparing the two pathways
Photosynthesis
Cellular
Respiration

26. Photosynthesis
Cellular Respiration

28. Which cellular organelle is responsible for photosynthesis?

29. Which cellular organelle is responsible for cellular Respirations?

30. Photosynthesis takes place in _____.
A. Plants
B. Animals
C. Both

31. Cellular Respiration takes place in takes place in _____.
A. Plants
B. Animals
C. Both

32. 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

33. Which cellular organelle is responsible for photosynthesis?
Chloroplast

34. Which cellular organelle is responsible for cellular Respirations?
Mitochondria

35. Photosynthesis takes place in _____.
A. Plants
B. Animals
C. Both

36. Cellular Respiration takes place in takes place in _____.
A. Plants
B. Animals
C. Both

37. 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