BIOL1406 Plant Photosynthesis 162536 PDF

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Download BIOL1406 Plant Photosynthesis 162536 PDF

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BIOL 1406 Plant Photosynthesis Final Report Lesson

Plant Photosynthesis

Institution

Temple College

Session

Spring 2021 (Session II)

Course

BIOL 1406

Instructor

Eduardo Salazar

Exercise 1 1. What was the purpose of creating a sodium bicarbonate solution? What was the purpose of adding soap to the solution? The purpose of creating a sodium bicarbonate solution is to provide carbon which is useful in the photosynthesis process. Adding soap to the solution aided in the movement of the sodium bicarbonate into the leaf disks by cutting down the spinach leaves waxy cuticle.

2. Why does a floating leaf indicate that photosynthesis is occurring? The oxygen that is produced is what is making the leaf float. O2 is the result of the photosynthesis process.

3. Is it possible that photosynthesis is occurring in a leaf that is not floating? Explain this and support your answer with your data. The Sodium Carbonate solution changes the density of the leaf which is what is allowing it to float. If the leaf is not floating, there is no production of O2 so photosynthesis is not occurring

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4. Would spinach leaves have a greater rate of photosynthesis in the bicarbonate solution you created or in atmospheric air? Support your answer. Because the sodium bicarbonate solution provides more carbon, the leaves would have a greater the rate in the solution than in atmospheric air.

5. Does the light‐independent pathway of photosynthesis continue to occur when the leaf disks are placed in the dark environment? No, taking away the light-independent pathway drastically slows down the process. In the dark environment, the disks began to sink.

6. Write a short discussion describing trends in the data: compare the control cups (distilled water) versus the experimental cups (bicarbonate solution) and compare the light versus dark environments. The control cups of Distilled water, light and dark provided us with the expected results. We are able to compare the results of the control cups to the experimental cups with the sodium bicarbonate solution. The leaves in the sodium bicarbonate light cup rose as expected and the leaves in the sodium bicarbonate dark cup did not. In the control cups of distilled water, the leaves remained at the bottom.

7. Was your hypothesis supported or refuted? Write a one‐to‐two sentence conclusion to summarize your experimental findings. The results of the experiment supported my hypothesis. The only leaf disks that rose to the top of the surface were the disks that were in the sodium bicarbonate solution under the light.

Data Table 1: Testing Photosynthesis in the Light and Dark Environments

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Hypothesis:

If leaf disks are placed in a sodium bicarbonate solution under direct light, then they will float to the top of the surface.

Time (min)

Distilled water, light: # of floating disks

0

0

2

0

4

0

6

0

8

0

10

0

12

0

14

0

16

0

18

0

20

0

Hypothesis:

Time (min)

Sodium bicarbonate, light: # of floating disks

0

0

2

0

4

1

6

1

8

2

10

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3 12

4

14

6

16

8

18

8

20

8

Hypothesis:

Time (min)

Distilled water, dark: # of floating disks

0

0

2

0

4

0

6

0

8

0

10

0

12

0

14

0

16

0

18

0

20

0

Hypothesis:

Time (min)

Sodium bicarbonate, dark: # of floating disks

0

0

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2

0

4

0

6

0

8

0

10

0

12

0

14

0

16

0

18

0

20

0

Data Table 2: Testing the Dark Environment

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Time (min)

Distilled water, light: # of floating disks

Sodium bicarbonate, light: # of floating disks

0

0

8

2

0

8

4

0

6

6

0

6

8

0

5

10

0

4

12

0

4

14

0

2

16

0

2

18

0

1

20

0

0

Graph 1: Time and Number of Floating Disks

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Exercise 2 1. Report your data. Upload images of any graphs or tables you have created in Graph 2.

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2. Write a short discussion that describes your experimental findings: describe in words the trends in the data that you recorded. My experimental findings were that by increasing the sodium bicarbonate solution, the rate of photosynthesis increased. The disks began to float almost immediately once they were placed under the light. There was no change in the disks in the sodium bicarbonate solution that was in the dark

3. Was your hypothesis supported or refuted? Write a short one‐to‐two sentence conclusion that summarizes your findings. My hypothesis was supported, the rate increased with a higher concentrate of sodium bicarbonate

Data Table 3: Photosynthesis Investigation Question:

Does the concentration of Sodium bicarbonate affect the rate of photosynthesis?

Hypothesis:

If a solution has a higher concentration of sodium bicarbonate, then it will increase the rate of photosynthesis.

Experimental Design:

Repeat exercise 1 increasing the amount of sodium bicarbonate from .4 to .8. Place one cup under a lamp and the other in a dark box or cabinet.

Graph 2: Data, Graphs, or Tables

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Copyright 2021 - Science Interactive | https://scienceinteractive.com...