Getting To Know Photo!! Photosynthesis That Is.. By now you should have a pretty good understanding as to what plants are doing during the process of.

Getting To Know Photo!!

Photosynthesis That Is.

By now you should have a pretty good understanding as to what plants are doing during the process of photosynthesis. If you are still a little confused, simply break the word down into its components….

Photo=Photo=

Synthesis=Synthesis=

Let’s Review the PHOTOPHOTO part of

PhotosynthesisPhotosynthesis

Based on the graph below, what color is this object:

0%

4%

0%

96% 1. Red and blue/green

2. Orange and yellow

3. Yellow and blue

4. Blue and violet

Based on the results below, which of the following pigments is most likely the smallest molecule:

0%

87%

13%

0%

Chlorophyll B

Chlorophyll A

Xanthophyll

Carotene

1. Chlorophyll a

2. Chlorophyll b

3. Carotene

4. Xanthophyll

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

21 22 23 24 25 26 27

How Do You Know?????

Based on the graph, what colors are best absorbed by this plant:

0%

0%

100%

0% 1. Green and orange

2. Red and violets

3. Violet and green

4. Green and reds

Based on the graph below, which color light is best absorbed by plants for

photosynthesis

74%

0%

17%

0%

9% 1. Red

2. Yellow

3. Green

4. Orange

5. Violet

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

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During our last class, we looked at the relationship between pH and the rate of photosynthesis. Before we could discuss this we needed to review the ph scale. Do you remember???

The pH range for acids???The pH range for acids???

The pH range for a base???The pH range for a base???

Carbon DioxideCarbon Dioxide + + WaterWater + + Light energyLight energy OxygenOxygen + + GlucoseGlucose CO2CO2 H2OH2O photonsphotons OO (C,H source)(C,H source)

The equation for photosynthesis is as follows….

As you can see, carbon dioxide is needed by plants for photosynthesis to take place.

That’s right. Plants need carbon dioxide in order to

make sugar!!!

Where do they get the carbon dioxide they

need???

YOU!

Remember, Bromothymol blue is blue when the pH is high

(8-14 range)

If the pH is high, BTB is blue like the sky!!

When carbon dioxide is added to water or BTB, the pH of that water/BTB:

68%

5%

27%

0%

CO2 pH

1. Increases and becomes more acidic

2. Decreases and becomes more basic

3. Increases and becomes more basic

4. Decreases and becomes more acidic

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

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If carbon dioxide was added to BLUE bromothymol blue, this blue solution

would…..

84%

11%

5%

21%

5% 1. Become more acidic

2. Turn Yellow

3. Support photosynthesis if elodea were added

4. Have a ph range lower than 7 and be considered an acid

5. All of the above1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

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Remember, if the pH is low (1-6) the BTB turns yellow like the snow.

What can you conclude about the levels of carbon dioxide in the

solution?

NOW,This yellow solution of BTB is loaded with

carbon dioxide and ready for a plant in order to conduct photosynthesis.

When the plant is added to this yellow BTB solution, this solution

will…

95%

5% 1. Remain yellow

2. Turn blue

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

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WHY??

Which of the following graphs represents what will happen to the pH of water high in

CO2 if photosynthesis is occurring:

0%

19%

81%

Time

PH

Time

PH

A

B1

14

1

14

1. A

2. B

3. None of the graphs

WHY?WHERE IS THIS CARBON

DIOXIDE “GOING?”

Now that we seem to understand the...

•Reactants and products needed for photosynthesis

•What plants are doing during photosynthesis

•The relationship between pH and rate of photosynthesis

Let’s look at cellular respiration in greater detail.

I think you will see these processes go together like peas

and carrots.