A chemical known as a fertex affects external fertilization of sea urchin eggs. An experiment was set up using three tanks to investigate the effect of fertex. Each tank had a different concentration of fertex: 1%, 2%, and 3%. Ten sea urchin eggs and 2mL of sea urchin sperm were added to each of the three tanks. A fourth tank was set up as a control.
State one example of the type of data that should be collected during the experiment.
Identify the independent variable in the experiment.
State one way to improve the validity of the experimental results.
Identify two factors that must be kept the same in all four tanks.
State one way the contents of the control tank would differ from the contents of the three experimental tanks.
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I'd be happy to help you understand the questions. Let's go through each one step by step:
1. State one example of the type of data that should be collected during the experiment.
To answer this question, think about what you would want to measure or observe in this experiment. Since the experiment is investigating the effect of the fertex chemical on external fertilization of sea urchin eggs, one example of data that should be collected could be the number of fertilized sea urchin eggs in each tank after a certain period of time.
2. Identify the independent variable in the experiment.
The independent variable is the factor that is intentionally changed or manipulated in an experiment. In this case, the independent variable is the concentration of fertex in each tank: 1%, 2%, and 3%.
3. State one way to improve the validity of the experimental results.
Validity refers to the extent to which an experiment measures what it intends to measure. To improve the validity of the experimental results, it is important to control extraneous variables. One way to do this is by keeping the tanks under the same environmental conditions (e.g., temperature, light exposure, pH levels, etc.) to ensure that these factors do not interfere with the observed effects of fertex on the sea urchin eggs.
4. Identify two factors that must be kept the same in all four tanks.
To ensure a fair comparison, certain factors should be kept consistent across all four tanks. Two important factors that must be the same in all four tanks are the initial number of sea urchin eggs (10 eggs) and the amount of sea urchin sperm added (2mL).
5. State one way the contents of the control tank would differ from the contents of the three experimental tanks.
The control tank serves as a baseline for comparison and does not have the independent variable applied to it. In this experiment, the control tank would not have any fertex added to it, while the three experimental tanks would each have a different concentration of fertex (1%, 2%, and 3%). The control tank is used to observe the natural or baseline conditions and allows for comparison to determine the effects of the different fertex concentrations.