Question

scientific method some students grew sunflower plants in their schools biology laboratory. the following table and graph show the conditions and results of the experiment after three weeks. use this information to answer the following questions. 1. was this a controlled experiment? explain your answer. (2 points) 2. formulate a possible hypothesis for this experiment. 3. independent variable: 4. dependent variable: 5. experimental group: 6. control group: 7. analyze the data. describe the results. 8. what conclusions can you draw from the experiment?

Explanation:

1. A controlled experiment has one variable changed while others are kept constant. Here, temperature, humidity, water, and light - duration are constant, and only light - color varies, so it is a controlled experiment.
2. A hypothesis could be that plants grow better under violet light than other colors because different light wavelengths may affect photosynthesis differently.
3. The independent variable is the factor that is deliberately changed, which is the color of light.
4. The dependent variable is what is measured as a result of the change in the independent variable, which is plant growth.
5. The experimental groups are the plants exposed to different colored lights (violet, green, white).
6. The control group is the plant under normal white light for comparison.
7. The data shows that the plant under violet light grew the most, followed by the plant under green light, and the plant under normal white light grew the least.
8. The conclusion is that violet light may be more beneficial for sun - flower plant growth compared to green and normal white light within the conditions of this experiment.

Answer:

1. Yes, it is a controlled experiment because only the color of light is changed while temperature, humidity, water amount, and light - duration are kept constant.
2. Plants will grow better under violet light than under green and normal white light because different light wavelengths affect photosynthesis differently.
3. Color of light
4. Plant growth
5. Plants A (violet light), B (green light), C (white light)
6. Plant C (white light)
7. The plant under violet light grew the most, the plant under green light grew second - most, and the plant under normal white light grew the least.
8. Violet light may be more beneficial for sun - flower plant growth compared to green and normal white light under the conditions of this experiment.