The Affect of Diffrent Colored Light on Plant Growth

Topics: Photosynthesis, Color, Light Pages: 5 (1071 words) Published: December 12, 2012
The Affect of Different Colored Light on Plant Growth

Puprose: Just as we are happier and healthier when we receive adequate sunlight, so are the plants and vegetation that we grow. Sunlight, or other means of artificial lighting is essential to help a plant grow into maturity. It is also necessary in aiding the plant to get the nutrients it requires to mature into a strong healthy plant. The process of the sun or other light helping to feed the plant is called photosynthesis. The light acts as an energy source to help the plant separate carbohydrates from carbon dioxide. Moisture mixes with this and turns into a glucose and feeds the plant. The plant in turn releases oxygen into the air to make the air we breathe cleaner. In our plant lab, we use the different colors of light to help our plant grow. We used red, blue, normal classroom lighting and no lighting for lab. The purpose of this lab whether or not light had an effect on plant growth and which color. Hypothesis: My hypothesis is that the light colors red and blue’s plans will grow the most. I think that they will grow the most because they are the main to light colors that are absorbed by chlorophyll which therefore is a factor of plant growth. I also hypothesize that normal light will grow second most and that the no light plant will die. Materials: 4 pieces the materials we will need are:

4 pots
4 parsley plants
Colored Transparencies: red and blue
2 lamps
Methods: There are 11 steps you must follow in our lab.
1.Place 3 lamps on a table
2.Place the red and blue transparencies on the table
3.Cut 2 square pieces one red and one blue transparencies that would fit over the lamp. 4.Tape the transparencies on the lamp
5.Place lamps in three different cabinets and Plug the lamps in 6.Place 4 pots on the table and label them 1 to 4.
7.Put 1 parsley plant in each pot
8.Put 50mL of soil in each pot
9.9our 150mL of water in each pot.
10.Place 1 plant in the cabinet with the red light, one with the blue light, one in an empty cabinet and the last is to be left out on the table. Observations:
Plant 1: (Red lamp)
Day 1:
Didn’t grow at all
Soil was wet & rich
Grew a leaf
Day 2:
Grew about 2cm
Soil was wet & rich
Day 3:
Grew about 1.5cm
Soil was wet & rich
Grew about 1.5cm
Grew about wet & rich
Grew another leaf
Day 5:
Plant beginning to whither
Change of color in plant
Plant 2: (Blue lamp)
Day 1:
Plant didn’t grow
Soil was wet & rich
Day 2:
Plant grew 1.5 cm
Plant grew leaf
Day 3:
Plant grew 1.7cm
Plant grew another leaf
Plant 3: (Normal light)
Day 1
Plant grew about .5 cm
Soil was wet & rich
Day 2
Plant grew 1 cm
Soil was becoming dry
Plants color beginning to fade
Day 3:
Plant died
Plant 4: ( No light)
Day 1:
Grew about .2 cm
Soil was damp
Day 2:
Plant color sort of brown
Leaf withered
Plant dead
Day 1:
Grew about .4 cm
Soil was damp
Day 2
Plant color sortof brown
Withered leaves
Dead plant

Generally, you can say that what should’ve happened was that the red and blue plants were supposed to grow the most. This is because red and blue are the primary colors absorbed by the chloroplast. Blue and red light, which plants absorb, have the greatest effect on plant growth. Blue light is responsible primarily for vegetative (leaf) growth. Red light encourages flowering. It is even said that red should’ve grown the most, then second to that is blue. The next plant that should’ve grown third to red and blue is the plant with normal light. It has a source of light which allows it to photosynthesize, the right amount of soil and water as well. And lastly the plant with no light. Inevitably, this plant is the plant that was supposed to die first. Since this plant was in the dark most of the time, and was always wet, it could not photosynthesize, and as a result should’ve...
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