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PROBLEM

Do plants need light to maintain their color?

 


 
HYPOTHESIS #1 (75% of the class)

 

A leaf will not maintain its color when denied light.

 

 

HYPOTHESIS # 2 (25% of the class)

 

A leaf will maintain its color when denied light.


MATERIALS

Per Group

*      Plant with broad leaves (Hawaiian Pothos)

*      Potting Soil

*      Large plastic measuring cup

*      Black construction paper

*      Transparent material (plastic bags)

*      Scissors

*      Scotch tape

*      Crayons or colored pencils

*      Data/Observation Sheets



PROCEDURE

 

1.           Each trial group located a pair of leaves that were similar in appearance.
 

2.           One of the leaves in the pair was covered with black construction paper and the edges were taped to block light from reaching the leaf.

3.           The other leaf was covered in transparent plastic material and taped at the edges.

4.           Steps 1 through 3 were repeated until each trial group had covered a total of ten leaves.

5.           As each pair of leaves was covered, each trial group numbered the leaf pairs in order from 1 to 5.

6.           Each day, for five consecutive school days, the black construction paper and the transparent plastic was removed from a set of leaves.

7.           Trial groups recorded their observations of the similarities and differences for both types of leaf covers.

8.           Observations were made in both written form and by illustrating what the leaves looked like.

 


RESULTS

Trial 1:  Based on our results, we noticed a difference in the color on our black paper covered leaves.

 

Trial 2:  Based on our results, we noticed there was a change in the color of the black paper covered leaves.

 

Trial 3: Based on our results, we noticed that the black paper covered leaves had a change in color.



CONCLUSION

After reviewing the data from all three trials, we conclude that plants need light to maintain their color.

 


PICTURES





                          



     




EXTENSION
  1. Instead of collecting data over consecutive days, it might be better to collect data on a weekly basis. This would allow more time for possible change to occur in the color of the leaves.

  2. Prior to starting the experiment, it might be better to take pictures of the leaf pairs before wrapping them. This would help when making observations of the changes in the leaves.

  3. Instead of using a Hawaiian Pothos, it would probably be better to choose a plant that is a solid green, rather than having a combination of yellow, white, and green.  This would make it simpler to observe changes in the leaves.

  4. It might be better to have fewer people in the Trial Groups so personalities donít conflict with each other.

  5. Instead of using black construction paper, it might be better to wrap leaves with aluminum foil. This would probably block the light out better and be easier to remove for the observation.


Last Updated: 7/5/05
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