Name______Date ______Period______

PHOTOSYNTHESIS REVIEW

Label and define the following leaf structures:

Cuticle-waxy covering on top of leaves

Epidermis-outermost cells

Mesophyll- area where photosynthesis occurs

Stoma (Stomata)-openings for CO2+ and O2 transfer

Vein (includes xylem and phloem)-carry nutrients and water to and from the leaves

Guard cells-allow stomata to open and close

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

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

A. ADP

B. water

C. glucose

D. adenine

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

A. phosphates

B. foods like glucose

C. organelles

D. ADP

What is it called? / DESCRIPTION / GIVE 2 EXAMPLES
autotroph / Organisms that can make their own food / Plants, algae
heterotroph / Organisms that obtain energy from the food they eat / Animals, fungi

What is the ultimate source of energy autotrophs use produce their own food? ____Sun____

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

___heterotroph______autotroph______heterotroph_____

Hint: What color are mushrooms?

NAME THE CHEMICAL COMPOUND SHOWN BELOW THAT CELLS USE TO STORE ENERGY. ATP__

LABEL THE PARTS THAT MAKE UP THIS MOLECULE:

A= ______adenine______

B= ______ribose______

C=______phosphates______

WHAT DOES ATP STAND FOR?

A__denosine______T____riphosphate______

HOW MANY PHOSPHATES ARE IN ONE MOLECULE OF ADP? ___2____

HOW IS ATP MADE FROM ADP?


Add one phosphate to ADP, ______

USE the words: ENERGY STORING and ENERGY RELEASING to label what is happening in the reactions shown below:

______releasing______storing______

Describe what Jan van Helmont discovered with his 5 year experiment.

He discovered that plants absorb water and need the water to grow

What did Priestly discover about photosynthesis?

Plants give off O2

Jan Ingenhousz showed the effects of Priestly’s experiment only happens when the plants are exposed to _light______.

Where in a plant cell does photosynthesis take place?

A.  Mitochondria

B.  Lysosome

C.  Nucleus

D.  Chloroplast

USE THE LETTERS IN THE CHLOROPLAST DIAGRAM TO IDENTIFY:

_A___ stroma

__C__ thylakoid

__B__ granum (grana)

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

A. thylakoids

B. pigments

C. chloroplasts

D. glucose

Use the absorption spectrum of chlorophyll below to answer the following questions.

According to the graph above, which of the following wavelengths is most reflected by chlorophyll a?

a. 465 nm b. 490 nm

c. 625 nm d. 665 nm

According to the graph, which of the following colors whould be best to shine on a plant to maximize photosynthesis?

a. green b. yellow

c. orange d. red

Write the colors of the 3 accessory pigments:

Carotenoids-yellow and orange

Anthocyanin-blue and red

Xanthophyll- yellow

How does the energy compare of waves in the EM spectrum that have longer vs. shorter wavelengths?

Shorter wavelengths have more energy

How can you remember the colors of the rainbow? Which color has the most energy and the least?

ROYGBIV, violet most and red least

Plants appear green to us because they ___reflect__ green wavelengths and _absorb_____all of the other colors of wavelengths.

What environmental factor is the cause for leaves to start to change color?

Shorter days

Why is it that we see reds, yellows, and oranges on the leaves in the fall?

The chlorophyll is pulled into the trunk of the tree for the winter months and the remaining pigments are able to be seen until they break down.

Write the complete overall chemical equation for photosynthesis using CHEMICAL SYMBOLS:

____sun______

___6CO2____ + ___6H2O___ → ____6O2____ + __C6H12O6___

Write the complete overall chemical equation for photosynthesis using WORDS:

__sun___

__Carbon dioxide___ + __water___ → ____oxygen____ + ____glucose___

In this Diagram of photosynthesis, label light, water, oxygen, CO2, sugars, NADP+, ADP, NADPH, ATP, light dependent reaction, Calvin cycle, granum, stroma

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

1 2 3 6 12

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

B. water vapor

C. carbon dioxide

D. oxygen

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

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

A. ATP

B. H2O

C. NADP+

D. CO2

The Calvin cycle is another name for ______

A. photosynthesis

B. the electron transport chain

C. light-dependent reactions

D. light-independent reactions

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

1. ___amount of sunlight___

2. __temperature____

3. ___amount of water______

4. ____amount of CO2______

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.

T F Increasing light intensity decreases the rate of photosynthesis. ______

T F Carbon dioxide molecules enter the light-dependent reactions from the atmosphere.

______

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

T F The light-dependent reaction produces ATP, NADPH, and carbon dioxide. ______

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

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 / grana / stroma
REACTANTS / H2O / CO2
PRODUCTS / O2 / Sugar (glucose)
LIGHT? / Needs light / Does not need light

THINK ABOUT IT

Which of these graphs represents the effect of temperature on the rate of photosynthesis? ______

(Hint: Many molecules that help with photosynthesis are enzymes)

EXPLAIN YOUR ANSWER. _____C, the enzymes denature is the temp gets too high ______

______

Which of these graphs represents the effect of light intensity on the rate of photosynthesis? ______

EXPLAIN YOUR ANSWER. ______A, rate will increase to a point and then plateau ______

______

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