Design an experiment to determine the effects of amount of light on the growth o

Question

Design an experiment to determine the effects of amount of light on the growth of tomato plants. Hypothesis: (Use if...then...statement) Identify: - Independent variable ? - Dependent variable ? Any pertinent information about the population. Procedure: Describe set up. List steps. What is the control? Why is a control needed? List 3 controlled variables. Expected Results: Is your experiment qualitative or quantitative? Explain Design an experiment to determine the effects of amount of light on the growth of tomato plants. Hypothesis: (Use if...then...statement) Identify: - Independent variable ? - Dependent variable ? Any pertinent information about the population. Procedure: Describe set up. List steps. What is the control? Why is a control needed? List 3 controlled variables. Expected Results: Is your experiment qualitative or quantitative? Explain

Explanation / Answer

Hypothesis: If tomato plants are exposed to more light, they will grow larger than tomato plants that are exposed to less light. Independent variable: Light exposure Dependant variable: The growth of the tomato plant *The independent variable causes the change in the dependant variable Steps: 1. Acquire, from the same source, nine tomato plant seeds. 2. Separate the nine seeds into groups of 3, and label group A, B, and C. 3. Water the seeds at the same time every day. The amount of you water per seed/ per group must be recorded. 4. Keep in mind to control the environment, therefore each group must be kept in the same environmental conditions. 5. Designate light control: Group A no sunlight, Group B 12 hours of light, and Group C 24 hours of light. 6. Place the plants under a direct light source. Have the light source on a time controlled switch. The time control will designate how long the light will shine directly onto the plants based upon the designated timed light exposure for each group. 7. After each week of growth record the length of the tomato plants. 8. Assess whether light exposure had any effect on the tomato plants growth rates. The control group is the group A. The reason why A is the control group is because group A was not exposed to a light source through the experiment. The experimental groups are group B and C, because both groups B and C were exposed to light. The control is needed to be a reference of comparison for the experiment of both groups B and C. The controlled variables: 1. The amount of light exposure 2. The source of the seeds 3. The environment The expected results: The expected results would indicate that exposure to a light source does indeed enhance a tomato plants growth rate. The experiment is quantitative because you are measuring the size of the plants growth. I hope this is close to what you are looking for! Sources: B.S. in Animal Science Minor in Biology http://answers.yahoo.com/question/index?qid=20080113091609AAorlAZ

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