The Effects of Light Intensity and Wavelength on the Rate ...



The Effects of Light Intensity and Wavelength on the Rate of Photosynthesis

Overview of Reaction

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In this simulation, you will be manipulating two variables: light intensity and light wavelength. The amount of ATP produced will change depending upon the set parameters. Go to "Johnson Explorations: Photosynthesis" located at . Look over the diagram before clicking on "skip intro" so you have a fair idea what is going on, the above diagram will also help.

Procedure: Your task is to use the simulation to determine how wavelength and intensity affect the rate of photosynthesis (and the production of ATP). Keep in mind you are dealing with two variables, so in order to determine absolutely how each factor affects photosynthesis, you must keep one variable constant while manipulating the other variable.

Lab Report must contain the following sections. Due Friday 20 October

1. Introduction: Describe briefly the light dependent reactions and propose a hypothesis to answer the experimental question.

2. Variables: What did you control and what variable you changed

3. Data: Include data tables for the simulation. The tables must show clearly trends resulting from changes of intensity and changes of wavelength.

4. Graph: Showing how the percentage of ATP changed (Y axis) as a result of changes in wavelength and intensity (X axis). Two graphs would be best here on graph paper.

5. Conclusion: Use your data to answer the experimental question. Answer clearly how light wavelength affects the reaction, and how light intensity affects the reactions. Offer an explanation of the results, taking into account the principles of photosynthesis and the light reaction.

Grading Rubric:

| |Poor (1 pts) |Satisfactory (2 pts) |Good ( 3 pts) |

|Introduction |Explanation of light dependent|Offers explanation of the reaction, |Offers good explanation of the light dependent |

| |reaction lacking and/or |some parts vague or incorrect. |reaction, includes how light is used to produce ATP |

| |Hypothesis missing. |Hypothesis unclear or does not answer |and NADPH. Proposes hypothesis to answer experimental|

| | |experimental question fully. |question. |

|Data |Variables not separated, data |Organized, though trends are not |Well organized into tables, variables separated, data|

| |disorganized, trends not |obvious from the layout. Hard to read,|clearly shows trends |

| |apparent. |taking some time to figure out. | |

| |Not enough data was taken to |A fair amount of data was taken, |Enough data was taken to clearly show trends |

| |test variables |enough to show trends | |

| |Graphs poorly labeled, |Graphs missing some labels or |Graphs all labeled correctly, easy to read |

| |difficult to read. |incorrectly set up | |

|Conclusion |Does not answer experimental |Answers experimental question, data |Answers experimental question, follows data, |

| |question. Erroneous |used to support argument unclear, or |conclusions are not erred. |

| |conclusion. |partially incorrect analysis | |

| |Explanation attempted, but |Explanation is reasonable, but does |Explanation for results is reasonable and takes into |

| |fails to explain data trends |not take into account important |account principles of photosynthesis |

| | |aspects of photosynthesis | |

|Format & |Not Neat and/or on time |Not Neat but on time |Total: ______ out of 20 |

|Timely | | | |

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