Name______Date ______Period______

PHOTOSYNTHESIS STARTS WITH

1. Molecules that collect light energy are called _P______.

2. Chlorophyll a and b absorb _B______-_V______and _R_ __ __ wavelengths of light best.

5. _C______is the main light absorbing pigment found in green plants.

3. Plants “look” green because chlorophyll _R______green light.

4. Organisms, like green plants, that can make their own food using energy from the sun are called
_A______.

5. The gel-filled space inside the chloroplast surrounding the thylakoid stacks is called the

_S______.

6. The enzymes for the light dependent reactions are found in the _T______
_M______, while the Calvin cycle happens in the _S______.

7. The stacks of thylakoids found inside chloroplasts are called _G______.

8. The light independent reactions are also called the _C______C______.

9. Carbon and oxygen from _C______D______end up as part of a

_G______molecule following the Calvin cycle.

10. _A_ __ __ and _N______are made during the _L______dependent reactions and
carry energy and high energy electrons that are used during the Calvin cycle to produce
_S______, like glucose.

11. The O in H2O is given off as_O______gas to the atmosphere when water is split during
the light dependent reactions.

12. Proteins in living things that help chemical reactions happen are called _E______.

13. Electrons are transferred along the membrane from Photosystem II to Photosystem I using the

_E______T______S______.

14. Orange and yellow colored pigments called _C______absorb different wavelengths of light and help chlorophyll use more of the sun’s energy.

15. _T______, amount of _W______, and _L______intensity are all factors that affect the rate of photosynthesis.

ENERGY AND LIFE

MULTIPLE CHOICE: CIRCLE ALL THE STATEMENTS THAT ARE TRUE. THERE MAY BE MORE THAN ONE CORRECT ANSWER.

16. Which molecule stores more than 90 times the energy in an ATP molecule?

A. ADPC. glucose

B. waterD. adenine

17. All organisms get the ENERGY they need to regenerate ATP from ______

A. phosphatesC. organelles

B. foods like glucoseD. ADP

18. Which of the following are TRUE about ATP?

A. ATP consists of ribose sugar, adenine, and 3 phosphate groups

B. ADP forms when ATP loses a phosphate and releases energy.

C. Used ATP is discarded by the cell as waste.

D. ATP provides energy for active transport in cells.

19.What is it called? / DESCRIPTION / GIVE 2 EXAMPLES
Organisms that can make their own food
Organisms that obtain energy from the food they eat

20. What is the ultimate source of energy autotrophs use produce their own food? ______

21. On the line below each picture, classify the organism as either an AUTOTROPH or a HETEROTROPH.

______

Hint: What color are mushrooms?

22. NAME THE CHEMICAL COMPOUND THAT CELLS USE TO STORE ENERGY. ______

23. LABEL THE PARTS THAT MAKE UP THIS MOLECULE:

A= ______

B= ______

C=______

24. WHAT DOES ATP STAND FOR? A______T______

25. HOW MANY PHOSPHATES ARE IN ONE MOLECULE OF ADP? ______

26. HOW IS ATP MADE FROM ADP?______

27. USE the words: ENERGY STORING and ENERGY RELEASING to label what is

happening in the reactions shown below:

______

Name 3 cellular activities that use the energy stored in ATP:

28. ______

PHOTOSYNTHESIS: An Overview

29. Plants gather the sun’s energy with light-absorbing MOLECULES called ______.

A. thylakoidsC. chloroplasts

B. pigmentsD. glucose

30. Chlorophyll absorbs light very well in the ______regions of the visible spectrum.
(Circle all that are true)

A. blue-violetC. red

B. greenD. yellow

31. Most plants appear green because chlorophyll ______.

A. reflects green lightB. absorbs green light

32. A student conducts an experiment by collecting the gas given off by a green plant in bright sunlight at room temperature. The gas being collected is probably ______.

A. ATP C. carbon dioxide

B. water vapor D. oxygen

33. Write the complete overall chemical equation for photosynthesis using chemical symbols: ______

______+ ______→______+______

34. How many molecules of carbon dioxide (CO2) are used to make 1 molecule of glucose (C6H12O6) ?

123612

35. In addition to water and carbon dioxide, what two things are required for photosynthesis to happen?

______and ______

REACTIONS OF PHOTOSYNTHESIS

MULTIPLE CHOICE: Circle the letter of the answer that best answers the question.

36. The Calvin cycle is another name for ______

A. photosynthesis C.light-dependent reactions

B. the electron transport chain D. light-independent reactions

37. Which molecule acts as a carrier for high energy electrons during photosynthesis?

A. ATPC. NADP+

B. H2OD. CO2

38. How is the Calvin cycle different from the light-dependent reactions?

A. It takes place in chloroplasts.C. It requires light.

B. It takes place in the stroma.D. It takes place in the thylakoid membrane

39. Oxygen produced during the light-dependent reaction is ______.

A. used in the Calvin cycle to make sugar

B. joined with the NADPH to make water

C. is released into the atmosphere

D. None of these, oxygen is NOT produced by the light-dependent reaction

40. Name 4 factors that affect the rate at which photosynthesis occurs.

1. ______3. ______

2. ______4. ______

41. Identify which graph show the effect of which factor. Rate of photosynthesis is on the Y axis.

MODIFIED TRUE or FALSE

Circle T if the statement is TRUE.

Circle F if the statement is FALSE and use the blank provided to correct the underlined word/phrase.

42. TFIncreasing light intensity decreases the rate of photosynthesis. ______

43. TFCarbon dioxide molecules enter the light-dependent reactionsfrom the atmosphere.

______

44. TFPhotosynthesis uses energy from ATP and high energy electrons from NADPH produced in the light-dependent reactions to make glucose in the Calvin cycle. ______

45. TFThe light-dependent reaction produces ATP, NADPH, and carbon dioxide. ______

46. TFATP synthase spins like a turbine as H+ ions pass through it to generate ATP. ______

47. TFElectrons are energized twice during photosynthesis. ______

48.USETHE LETTERS IN THE DIAGRAM AT THE LEFT TO

IDENTIFY:

______stroma

______thylakoid

______granum

49. Describe 3 ways the structure of the leaf facilitates

the processes of photosynthesis:

50. Where does ATP formation happen? Stroma inner thylakoid space

51. Add an equation to the diagram in the correct location

that shows the formation of ATP from ADP.

52. USE WORDS FROM THE WORD BANK TO FILL IN THE CHART COMPARING AND CONTRASTING THE LIGHT-DEPENDENT REACTIONS AND THE CALVIN CYCLE: (You can use them more than once!)

in stroma in thylakoid membrane O2 ATP CO2 H2O NADPH

Requires light Doesn’t require light SUGARS (glucose)

LIGHT-DEPENDENT REACTIONS / CALVIN CYCLE
LOCATION
REACTANTS
PRODUCTS
LIGHT?

53. Label the diagram below to summarize the two stages of photosynthesis. Use the word bank

below the diagram to fill in the blanks.

thylakoidlight-independent reactionsCO2

granumlightNADPH

stromaH2OATP

light-dependent reactionssugarO2

54. Explain how photosynthesis and global warming due to carbon dioxide increases in

the atmosphere are related. What is one source of the steep increase in carbon

dioxide?

1