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UV Light effect on plants

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zack marchildon

on 17 January 2013

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Transcript of UV Light effect on plants

Foundation Light Boxes: How UV Light effects plant growth Plant: UV Light effect on plant growth Methodology Light box building Getting starting Introduction My experiment was to find how Ultraviolet Light effects the growth of spider plants. The purpose of this experiment was to see if ultraviolet wavelengths change the growth of a spider plant.

It is hypothesized that the plants under ultraviolet light will not grow as effectively as the plants under white light.

Ultra violet light is the shortest wave length of light that there is. It is the type of light emitted by the sun that can be harmful to humans eye and skin cells. Every plant reacts differently to wave lengths of light. An article called "The Effect of black light on plats" says that black light being the closest to Ultraviolet causes mutations to the plant (N.A ,November 2012). Mutations can be harmful to the plant but also can be beneficial. Being under black light can change the ratios and quantities of their pigments like carotene, if a plant was given the opportunity to have more carotene it could grow more effectively. Also Chlorophyll an important pigment in plants absorbs longer wavelengths of light more effectively.

In the experiment a black light was used which is the closest type of light to UV. It is compared to white light which is the closest type of light to the suns. White light gives off the whole spectra of light, short wavelengths and long wavelengths. Both the white and black bulb were Eco energy saving bulbs so that both groups would get the same amount of light and also the bulbs gave off minimal heat which made it more safe to use in the cardboard light boxes. Purpose: The plant used in the experiment was the spider plant. The spider plant is native to South Africa and is one of the fastest growing house plants (J.V, November 2012).Its scientific name is Chlorophytum comosum Variegatum and comes from the Liliaceae family. Since i had only two months to do the experiment the spider plant was the perfect choice. The fast growing abilities gave the opportunity to see more changes in growth. Also the spider plant can handle different intensities of light and does not have to be watered often. This plant worked out to be a good choice in getting some observations. Light boxes are cardboard boxes with an inner layer of aluminum foil. Through the top of the boxes are the light bulb that shines the light on the plants. This not only produces a lot more light going to the plants but also acts like a shield blocking out any other light from the plants. This helped make sure that the plants were only getting the light assigned to them for the experiment. Clones: Firstly I cut clones off of mature spider plants and put them into a dish with wet paper towel. This allowed for the roots of the clones to to stay moist so the roots can sprout and the plant can start to grow. The baby clones sat in the dish for two weeks until getting put in a pot of soil. While the clones where in the dish i started to build the light boxes. First i got four cardboard boxes. I cut the bottoms of all of the and the tops of two off. Then i filled the inside of each box with a layer of tin foil with duck tape. Each box with a top was duck taped on top of the box with a top. This made two bigger boxes with an inner layer of tin foil. Then a hole was cut into each of the tops of the bigger boxes allowing for the light bulb to sit at the top which was also duck taped. I then labeled one box control group holding the white light and the other the impact group holding the black light. Both lights were plugged into a timer shutting and turning them on and off at the same times. Once the clones had sprouted roots each plant was given there own pot with the exact amount of soil in each. Based on size i evened out each group with three plants to make it as equal as possible. Plants one, two and three were apart of the control group which was under white light and plants four, five and six were apart of the impact group and were under black light. One Two Three Four Five Six Each group was placed under their light box. They were watered every ten days with 1/2 cup of tap water and observed every ten days as well. I also took pictures of each plant at these times. Observations Through the 2 months of this experiment I observed six physical characteristics of each plant. Height of plant, width of plant, length of average petiole, width of average petiole, number of petioles and color pigmentation. Every ten days I would check these characteristics and mark them down in a chart. This allowed me to create this graph. This graph shows that on average every ten days the plants from the control group had a greater growth then that of the impact group. The chart also showed that the impact groups color pigmentaion changed. Sources of Error -Throughout the experiment there were three biases that affected the results:
-Over watering the plants.
-Hot spots created by the tin foil inner layer.
-To much light each day. -In conclusion the hypothesis was supported. The Plants in the control group under the white light had much more success growing then the impact group under the black light.
- Other then plant one dieing plants two and three were very successful in growing in all aspects i observed. Plant one from the control group and all the plants from the impact group were not successful, they actually all died and showed no positive growth rates.
- Browning from the tips of the petioles as all the impact groups plants did can be a cause from the plants not reacting well with the light that they were given.
- Plant one from the control group died in a different manner then the plants in the impact group. The impact groups plants first started browning at the tips of the petioles and slowly each petiole would then turn fully brown till there was none left. Plant one in the control group started wrinkling and curling up until the petioles rotted out. This could mean that plant one being one of the smaller plants to start was only get over watered. Conclusion References
VanZile, Jon. "Spider Plants -- Growing Spider Plants." Houseplants and Indoor Gardening — All About Indoor Plant Care — Tropical Plants for Indoors. N.p., n.d. Web. 14 Nov. 2012.http://houseplants.about.com/od/foliageplants/p/SpiderPlant.htm

"Grow Chlorophytum comosum (Spider Plant) to purify the air! | John&Jacq~s Garden." John&Jacq~s Garden. N.p., n.d. Web. 21 Nov. 2012. <http://www.jaycjayc.com/chlorophytum-comosum-spiderplant/>.

The Effect of Black Light on Plants | eHow.com." eHow | How to Videos, Articles & More - Discover the expert in you. | eHow.com. N.p., n.d. Web. 21 Nov. 2012. <http://www.ehow.com/about_6540574_effect-black-light-plants.html>

"Quick Tips for Seed Starting: Aluminum Foil Light Boxes - Yahoo! Voices - voices.yahoo.com." Yahoo! Voices - voices.yahoo.com. N.p., n.d. Web. 21 Nov. 2012. <http://voices.yahoo.com/quick-tips-seed-starting-aluminum-foil-light-boxes-7474630.html?cat=32>.

Rajeev, L. (n.d.). Spider Plant Care. Buzzle. Retrieved January 17, 2013, from http://www.buzzle.com/articles/spider-plant-care.html - Some ways these errors can be fixed is first doing more research to see how to better take care of plant. How much water they need exactly, amounts of light per day, etc.
- For the hot spots using a white plastic instead of tin foil still causes light reflection but allows for no heat to build anywhere. This would be more efficient for this experiment. Ways to fix the problems
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