Tigers Essay Research Paper Let There Be

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Tigers Essay, Research Paper Let There Be Light ? Introduction When we look at the sun, what do we see? Other than to squint our eyes and put your sunglasses on, you can see that the light is very bright and white-yellow in color. However, looking at light through a prism relates a different story. If Light is put up against a prism it is refracted or bent into a rainbow which contains the primary colors of light in which red light bends the least and violet bends the most ( Jude, 1999). The primary colors of light consist of red, orange, yellow, green, blue, and violet . Light is a wave that consists of oscillation in electric and magnetic fields that can travel through space. Plants absorb light in a process called photosynthesis( Gammon, 1999). Photosynthesis is defined as

the process by which green plants and certain other organisms use the energy of light to convert carbon dioxide and water into the simple sugar glucose. Photosynthesis provides the basic energy source for virtually all organisms. An important byproduct of photosynthesis is oxygen, on which most organisms depend. Plant photosynthesis occurs in leaves and green stems within specialized cell structures called chloroplasts. One plant leaf is composed of tens of thousands of cells, and each cell contains 40 to 50 chloroplasts. The chloroplast, an oval-shaped structure, is divided by membranes into numerous disk-shaped compartments. These disklike compartments, called thylakoids, are arranged vertically in the chloroplast like a stack of plates or pancakes. A stack of thylakoids is

called a granum (plural, grana); the grana lie suspended in a fluid known as stroma. Embedded in the membranes of the thylakoids are hundreds of molecules of chlorophyll, a light-trapping pigment required for photosynthesis. Additional light-trapping pigments, enzymes (organic substances that speed up chemical reactions), and other molecules needed for photosynthesis are also located within the thylakoid membranes. The pigments and enzymes are arranged in two types of units, Photosystem I and Photosystem II. Because a chloroplast may have dozens of thylakoids, and each thylakoid may contain thousands of photosystems, each chloroplast will contain millions of pigment molecules. ( Jude, 1999). This light converting into energy occurs in all plants. Photosynthesis is responsible for

plant growth and development due to light energy from the sun. This experiment asked the question, Which type of light do plants favor the most? A total of eighteen plants were subjected to two different types of light, nine were subjected to red light and nine were subjected to green light. In carrying out the experiment I devised a null hypothesis and an alternate hypothesis, Ho – There is no difference between growth rates in plants subjected to green light verses plant growth in plants subjected to red light. Ha – There is a difference between growth rates in plants subjected to green light verses plant growth in plants subjected to red light. METHOD The procedure in conducting this experiment was very basic. The materials used in this experiment included; twenty pea

seeds with radicle showing, 1 – 2 gallons of water, two planting trays with 3 X 4 planting containers, so a total of twelve of which only 10 were used, potting soil, a small shovel, red and green bulb lamps. Note: This experiment was carried out under no other exposure of light other that the ones being tested ( red & green ). To limit the amount of ?undesired? light and prevent an overlap of light between the two colors, cardboard boxes were put around and in between the two plant trays. Attempt to find a room that is dark as possible with the least amount of visible light to setup this experiment, place potting soil in the 3 X 4 tray containers until half-full. Place pea seed in potting soil, pushing down slowly until the pea seed was half under the soil and a green