Phototropism: A Battle For Light

Abstract

In our experiment, we want to observe how the plants grow when they are being covered, uncovered, and have a hole so we can research the tilt of the growth of the lima beans. To accomplish this, we will first prepare the cartons by using the permanent marker, label the sides of the milk cartons with the numbers 1–5, and prepare the cartons according to the amount of light exposure the plant will have in each. Afterward, we will observe the plant's growth and tilt and record its progress three times. The plant in carton 1 grew towards an angle of 85° up by day 9 as expected since it was exposed to perfect sunlight. The plant in carton 2 started to grow at an angle of 89° up by day 9 and started wilting exhibiting yellowish color and a weak stem. The plant in carton 3 grew towards an angle of around 67° tilting towards the side with light exposure by day 9 and showed some signs of wilting. The plant in carton 4 grew towards an angle of 59° by day 9, similar to the plant in carton 3, which also shows signs of wilting. The plant in carton 5 grew to an angle of 59° towards the side with light exposure by day 9 and showed minimal to no signs of wilting. In the one trial performed, all plant growth patterns shown in carton plants 1 through 5 showed predicted outcomes.