Tigers Essay Research Paper Let There Be

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 radicle could be seen. Place red and green lamp around the trays making sure

there is no overlap of light. Surround the area with cardboard. Water each individual

container. Note: Take all measurements in Centimeters. Record all measurements in

notebook. Describe the plants and how they are growing, e.g. withered, fallen down,

weak, etc.

Results

My findings showed me that green light plants grow at a faster rate than red light

plants do. This was confirmed by the provided graphs on the preceding pages. The

statistical tests of the significance of the difference between two groups or the t-test is

also shown in the preceding pages. I started recording data after leafs had shown. On first

day of recording data, the green light plants seemed very alive With tiny leafs at the

upper part of plant, the red light plants seemed withered and not much growth observed.

The second day, one could determine that the green light was better for the plants. Th

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