How Green Light Affect The Growth Of Plants Lab Report

Title: How Different Colored Lights Affect the Growth of Plants

Introduction:

This experiment had multiple objectives. The first objective was to establish what colors of the light spectrum photosynthesis uses. The second objective was to determine which colors in the light spectrum help a plant to grow faster, and which slow the growth of a plant down.

In photosynthesis, light energy from the sun is absorbed and reflected. When a plant has green leaves, the leaves appear green because the pigments inside the plant reflect the green light into our eyes and absorb the other colors in the light spectrum. The energy absorbed goes into Photosystem II and begins photosynthesis in the plant. The pigments inside of the cell are responsible

There were two predictions for this lab. The first prediction was if the red light is used, then the plant will grow faster. The second prediction was if the green light is used, then the plant will grow slowly. There were also two hypotheses used in this lab. The first hypothesis was that plants will grow faster when a red light is shined on it during synthesis. The second hypothesis is that a plant will grow slowly when a green light is shined on it during photosynthesis. The control variable in this lab was the amount of time the plants grew, the independent variable was the light filters, and the dependent variable was the plant’s

The first hypothesis of this lab was proved false. The first hypothesis of the red light making plants grow the fastest was wrong because the blue light filter made it grow an inch to an inch and a half taller than the red. In the experiment with lettuce, the plants under the red light grew to be 11 centimeters, while the plants under the blue light grew to be 12 centimeters. In the second experiment, plants under the blue light grew to become 14.5 centimeters, while the plants under the red light grew to be 13 centimeters. The second hypothesis, which said that the green filter would make plants grow the slowest, was both correct and incorrect. It was wrong because, in the first experiment, the green filter made the plants grow to 10 centimeters, while the orange filter made the plant grow to be 6.5 centimeters. In the second experiment, the plant under the green filter grew to 1.2 centimeters, which is 6.8 centimeters less than the second smallest plant under the orange