1. Describe photosynthesis in terms of how it transforms energy.
Autotrophs use energy from their environment to fuel the assembly of carbohydrates. Then, they combine and recombine these molecules to produce living tissue, such as cellulose.
Light Energy
Chemical Energy ?

2. Explain why light alone is not enough to make a glucose molecule.
Light is not made from atoms
Autotrophs use energy from their environment to fuel the assembly of carbohydrates. Then, they combine and recombine these molecules to produce living tissue, such as cellulose.

3. Explain how autotrophs obtain the carbon atoms needed to make glucose.
CO2 gas
Autotrophs use energy from their environment to fuel the assembly of carbohydrates. Then, they combine and recombine these molecules to produce living tissue, such as cellulose.

4. Explain how autotrophs obtain the hydrogen and oxygen atoms needed to make glucose.
Autotrophs use energy from their environment to fuel the assembly of carbohydrates. Then, they combine and recombine these molecules to produce living tissue, such as cellulose.

5. Explain how CO2 gas gets inside an autotroph. Leaf stomata
Autotrophs use energy from their environment to fuel the assembly of carbohydrates. Then, they combine and recombine these molecules to produce living tissue, such as cellulose.

6. Explain how H2O gets inside an autotroph. Roots
Autotrophs use energy from their environment to fuel the assembly of carbohydrates. Then, they combine and recombine these molecules to produce living tissue, such as cellulose.

7. In addition to glucose, what else does photosynthesis produce? O2 gas
Byproduct
Autotrophs use energy from their environment to fuel the assembly of carbohydrates. Then, they combine and recombine these molecules to produce living tissue, such as cellulose.

8. Explain how the O2 byproduct gets out of an autotroph. Leaf stomata
Autotrophs use energy from their environment to fuel the assembly of carbohydrates. Then, they combine and recombine these molecules to produce living tissue, such as cellulose.

9. How many CO2 molecules does an autotroph need to make 1 molecule of glucose?6 + +

10. + + Explain why 6 molecules of CO2 are needed to make glucose.
Glucose = C6H12O6 + +

11. How many H2O molecules does an autotroph need to make 1 molecule of glucose?6 + +

12. + + Explain why 6 molecules of H2O are needed to make glucose.
Glucose = C6H12O6 + +

13. + + Explain why photosynthesis produces 6 molecules of O2.
Too much oxygen is taken in
Extra oxygen is released as a byproduct + +

14. Explain why this is called the photosynthesis “equation.”
# of atoms on reactant side = # of atoms on product side
Atoms change, but are not destroyed
Energy absorbed
Autotrophs use energy from their environment to fuel the assembly of carbohydrates. Then, they combine and recombine these molecules to produce living tissue, such as cellulose.

15. Identify the location of photosynthesis in a eukaryotic cell.
Chloroplast

16. Identify structure A in the diagram below. Chloroplast

17. Identify structure B in the diagram below. Thylakoid

18. Identify structure C in the diagram below.
Granum (stack of thylakoids) D A E C B

19. Identify the molecules labeled D in the diagram below. Chlorophyll

20. Identify E in the diagram below. Stroma (clear liquid)

21. What are chlorophyll molecules able to do?
Absorb light energy

22. What is light?
Energy traveling in wave form

23. Why are there different colors of light?
Different wavelengths

24. White light from the Sun is actually a mixture of all the
of light.
wavelengths

25. Chlorophyll absorbs nearly 100% of and light.
purple
blue

26. Predict what would happen if you tried to grow a plant under pure blue light.
Chlorophyll absorbs blue light very well
The plant would grow

27. Chlorophyll absorbs about 80% of light.
red

28. Predict what would happen if you tried to grow a plant under pure red light.
Chlorophyll absorbs red light well
The plant would grow

29. Chlorophyll only absorbs about 10% of light.
yellow

30. Predict what would happen if you tried to grow a plant under pure yellow light.
Chlorophyll only absorbs a 10% of yellow light
The plant would only grow a little bit

31. Chlorophyll absorbs 0% of light. Instead, it
green light.
green
reflects

32. Predict what would happen if you tried to grow a plant under pure green light.
Chlorophyll does NOT absorb green light
The plant would not grow
The plant could die

33. Chlorophyll reflects green light
Explain why all autotrophs are green.
Autotrophs contain chlorophyll
Chlorophyll reflects green light