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Procedure II – Respiration Rates – 0% Illumination Data Run

 

 

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Complete the tables below using your data and information found under the Background tab (see the Summary of Needed Formulas section)

2

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3

TableTop Science – All Rights Reserved

 

 

Leaf

Sample

Type

Illumination

Level

Oxygen

Concentration

Change Data (ppm)

Elapsed

Time

(s)

Oxygen

Change Rate

(ppm/s)

Sun-

Adapted

0% -12.97 40  
Shade-Adapted 0% -7.78 40  

 

 

Leaf

Sample

Type

Illumination

Level

Carbon Dioxide

Concentration

Change Data (ppm)

Elapsed

Time

(s)

Carbon Dioxide

Change Rate

(ppm/s)

Sun-

Adapted

0% 12.97 40  
Shade-Adapted 0% 7.78 40  

 

Observations and Questions

 

 

[10] Sample Calculation: Show your oxygen change rate calculation for the Sun-Adapted data run.

 

 

 

[11] Sample Calculation: Show your carbon dioxide change rate calculation for the Shade-Adapted data run.

 

 

 

[12] What would be the photosynthesis rate if you measured it at 0% illumination in Procedure II? Explain your answer. Cite your results from Procedure I to assist with your explanation.

 

 

 

 

[13] Cite your results for the change in carbon dioxide concentration in Procedure II as a reference and compare the rates of cellular respiration for sun-adapted and shade-adapted leaves. Explain the biological principles/bases underlying this comparison.

 

 

 

 

Procedure III – Low-Light Net Photosynthesis Rates – 15% Illumination

 

Complete the table below using your data and information found under the Background tab (see the Summary of Needed Formulas section)

 

 

Leaf

Sample

Type

Illumination

Level

Oxygen

Concentration

Change Data (ppm)

Elapsed

Time

(s)

Oxygen

Change Rate

(ppm/s)

Sun-

Adapted

15% 4.42 40  
Shade-Adapted 15% 7.59 40  

 

 

4

TableTop Science – All Rights Reserved

 

5

TableTop Science – All Rights Reserved

 

Observations and Questions

 

[14] Sample Calculation: Show your oxygen change rate calculation for the Sun-Adapted data run.

 

 

 

 

[15] Based on the data you collected in Procedures I (100% illumination) and III (15% illumination), which system of leaves produces the most oxygen: Sun-adapted or shade-adapted? Explain how your results support your answer.

 

 

 

[16] Are your results from Procedure II and Procedure III consistent with research findings that there are differences in chlorophyll production and enzyme activity between shade-adapted leaves and sun-adapted leaves? Explain your reasoning. Cite your results from Procedure II and Procedure III to support your explanation.

 

 

Procedure I – 100% Illumination

 

Procedure II – 0% Illumination

 

 

 

Procedure III – 15% Illumination

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