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Leaves and Light

Science
by

L Aedo

on 4 February 2013

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Transcript of Leaves and Light

Leaves and Light Lucas Aedo BIBLIOGRAPHY PROCEDURE BACKGROUND RESEARCH HYPOTHESIS MATERIALS DATA ANALYSIS PURPOSE CONCLUSIONS RESULTS The purpose of this experiment is to see if some colors of light are more important than others during plant growth. There were slight changes in the appearance of the
leaves. The clear sleeves created no changes. The extra absorption of the color blue caused a darker green coloring in one leaf and a black spot on another. The green sleeved leaves all had a slightly darker green tip.
The leaves covered in the red and yellow sleeves formed
a few little dark spots near the tip of the leaves. And the leaves in the black sleeves did not appear to have much change, other than one leaf having a darker middle vein. clear transparency film
permanent markers: red, green, blue, and yellow
black construction paper
scotch tape
healthy, leafy green house plant
sunny window "Photosynthesis (biology)." Encyclopedia Britannica Online. Encyclopedia Britannica, n.d. Web. 11 Dec. 2012. <http://www.britannica.com/EBchecked/topic/458172/photosynthesis>. 1. Using the red, blue, green, and yellow permanent markers, color one sheet of transparency film completely with each color. Source 2 Lisa Willard 7th Grade How colors affect plant growth . How do plants absorb different wavelengths of light and what happens to the leaf if all of the light is missing? By finding out if certain colors help plants grow, that
knowledge can be used in the community to help local
famers grow their crops. If I add different colors onto leaves of a plant, then
that will show which wavelengths of light help the plant grow better. Plants make food in their leaves using energy from the sun. They use a molecule called chlorophyll that is present
in the leaves and makes them look green in color. Chlorophyll grabs energy from the sun by absorbing rays of light that travel in waves. 2. Cut the different colored sheets into six squares by cutting each sheet in half along the length and into thirds
along the width. Do this also with the black construction paper and a clear sheet of transparency film. 3. Make a sleeve by placing two rectangles of the same color together. Tape three sides together using the scotch tape. Making sure to leave one end open. 4. Carefully place the sleeves over the leaves one at a time,
trying to space the diferent colored sleeves around the plant. 5. Put the house plant in a sunny window for one week,
rotating the plant every day. 6. After one week, you will carefully remove the sleeves
from the plant one at a time, each time noting the color
of the sleeve and the apperance of the leaf in a data table. EXPERIMNTAL DESIGN Constant - type of plant used, volume and temperature of water to hydrate plant, soil, and amount of time exposed to light. Dependent Variable - leaves of house plant. Manipulated Variable - sleeves of different colored clear plastic and black construction paper applied to leaves. Control - leaves left alone to use as comparison to the ones put in colored sleeves. Sleeve Color Leaf #1 Leaf #2 Leaf #3 RED BLUE GREEN BLACK YELLOW CLEAR BACKGROUND RESEARCH Source 1 BACKGROUND RESEARCH Source 3 BACKGROUND RESEARCH Source 4 BACKGROUND RESEARCH Source 5 Eldridge, D., 2005. "The effect of light color and intensity on the rate of photosynthesis." Scotland: Science and Plants for Schools (SAPS). Web 11 Dec. 2012 http://www.saps.plantsci.com.ac.uk/articles/broad_light.htm Plant biomass is the food and fuel for all animals. Plants are the primary producers. They are capable of capturing the energy of sunlight and fixing it in the form of potential chemical energy in organic compounds. "Photosynthesis (biology)." Encyclopedia Britannica Online. Encyclopedia Britannica, n.d. Web. 11 Dec. 2012. <http://www.britannica.com/EBchecked/topic/458172/photosynthesis>. Photosynthesis is the process that green plants and certain other organisms transform light energy into chemical energy. Photosynthesis is very important in the maintenance of life on Earth. "How Does Different Color's of Light Affect Photosynthesis?" WikiAnswers. Answers, n.d. Web. 11 Dec. 2012. <http://wiki.answers.com/Q/How_does_different_color%27s_of_light_affect_photosynthesis>. Plants are green because they reflect green light more
than any other part of the color spectrum. During photosynthesis, plants use both ends of the light spectrum. "How Colored Light Affects Plant Growth." Yahoo! Contributor Network. N.p., n.d. Web. 12 Dec. 2012. <http://voices.yahoo.com/how-colored-light-affects-plant-growth-499379.html>. The color of light affects a plant's growth. The most effective kind of light for photosynthesis is certain red and blue wavelengths as they contain the right amount of energy to charge the chlorophyll electrons to a higher energy level. "PHOTOSYNTHESIS." PHOTOSYNTHESIS. N.p., n.d. Web. 13 Dec. 2012. <http://dwb.unl.edu/Teacher/NSF/C11/C11Links/gened.emc.maricopa.edu/bio/bio181/BIOBK/BioBookPS.html>. A pigment is any substance that absorbs light. If a pigment absorbs light energy, one of three things will occur. Energy is dissipated as heat. The energy may be emitted immediately as a longer wavelength, a phenomenon known as fluorescence. Energy may trigger a chemical reaction, as in photosynthesis. appears normal,
color unchanged leaf folded on one side,
about one 1" band of darker green
in middle of leaf to outer edge appears normal,
color unchanged appears normal,
color unchanged color unchanged, formed little
black spots on bottom of leaf one side folded in, leaf
color same, feels wet the tip of leaf is dark and feels
stronger dark green around
edges of leaf tip of leaf is dark green,
rest of leaf appears normal darker green coloring from
tip, till it gets to the middle back of leaf cuved in, formed some
little black spots under leaf
closer to tip back of leaf curved in
a lot, formed two black
spots at tip small, dark dot at tip of leaf raised little dark spots on
top and edge of leaf raised little dark spots on
edge of leaf darker green vein
down the middle of leaf,
the rest of leaf appears normal tip of leaf bent backwards,
color unchanged tip of leaf very dark Results are inconclusive. Unable to tell if some colors of light are more important than others during plant growth. A few leaves had some minor changes. The results were not enough to support my hypothesis that certain colors of the wavelength help plants grow better. I was hoping to see a stronger contrast between the different leaves used in the experiment. I believe that one week was not a long enough span of time to register marked changes. Although, during my research I did find that the colors blue and red are important colors of light used during photosynthesis. They also help the plant to be stonger.

Some minor errors that may have impacted my results was that every now and then the sleeves would fall off the leaves. I would improve on this experiment by taping the sleeves to the leaves next time. Also I would experiment on a variety of plants and for a longer duration. Eldridge, D., 2005. "The effect of light color and intensity on the rate of photosynthesis." Scotland: Science and Plants for Schools (SAPS). Web 11 Dec. 2012 http://www.saps.plantsci.com.ac.uk/articles/broad_light.htm "How Does Different Color's of Light Affect Photosynthesis?" WikiAnswers. Answers, n.d. Web. 11 Dec. 2012. <http://wiki.answers.com/Q/How_does_different_color%27s_of_light_affect_photosynthesis>. "How Colored Light Affects Plant Growth." Yahoo! Contributor Network. N.p., n.d. Web. 12 Dec. 2012. <http://voices.yahoo.com/how-colored-light-affects-plant-growth-499379.html>. "PHOTOSYNTHESIS." PHOTOSYNTHESIS. N.p., n.d. Web. 13 Dec. 2012. <http://dwb.unl.edu/Teacher/NSF/C11/C11Links/gened.emc.maricopa.edu/bio/bio181/BIOBK/BioBookPS.html>.
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