PHYS150 Technical Physics I

Part 1: How the color of lights affects the growth of a plant?

Introduction

The relationship between plant growth and light can be demonstrated by setting up an experiment of exposing the plant to different colors of light. Light is essential to plant growth as it supplies energy used during photosynthesis. The light spectrum utilized by leaves is categorized into three colors such as red, blue, and yellow.

The dependent variable in the experiment is Plant height. The constant variable is the soil quality and the amount of water. The control group is the amount of sunshine.

Question

What color of light is responsible for the plant to grow taller?

Hypothesis

The plant under the blue light grows taller.

Question 4

The student experimental results refute the data. It refutes the hypothesis that plants grow taller in blue light compared to natural yellow light.

How the experiment is validated?

The chosen colors include natural yellow and blue lights. The pots to the plants will be covered using a different colors of filters.

The same material of the filter with two different colors will be used to ensure an accurate and reliable change of the independent variable. All the plants will be placed in the growth chamber. In addition, all plants to be watered equally. The average height on each pot will increase

Experiment three times to increase the accuracy of results.

Results

The results support the data because as per the hypothesis the plants with the blue color of light grow taller compared to natural yellow light, but the results show otherwise.

Plant acquires their energy from light. Different types of light have different energy levels. Blue light supplies high energy levels thus facilitating the faster growth of the plant compared to plants under the natural yellow light.

Part 2

1. Reasons for conducting peer review (except)

Analyzing experimental design

2. The same experiment must be done severally to validate the results.
3. Effects of addition of protein formula to spinach growth

Proteins are large complex molecules that play an important role in facilitating the growth of plants.

Hypothesis

The addition of protein formula facilitates the rapid growth of spinach plants.

The dependent variable in the experiment is plant growth. The constant variable is the amount of water and phosphorous. The control group is the fertilizer used.

The independent variable is the amount of protein formula

In the experimental group, the normal experimental procedure is performed but in the control group, the plant growth is monitored with the addition of a different amount of protein formula.

The data collected supports the hypothesis

The researcher can validate the experiments by experimenting severally to obtain accurate results.

Part 3 

Question 2

1. Hypothesis

Thyroid hormones increase metabolic activity.

2. Experimental group will be tested using experimental procure while the control group will be tested with the independent variable which includes the amount of thyroxin administered.
3. The results support the data. The presence of thyroxin stimulates the metabolic activities in most of the animal tissues thus increasing the metabolism rate.
4. weight and age
5. The experiment supports the hypothesis. Thyroid hormones secrete thyroxin which increases the metabolic activities in rats.
6. By experimenting with different species of rats.

Exit ticket

1. Using different species of the rat

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