Question

directions: base your answers to the questions on the information below and your knowledge of biology. a genus of flies, drosophila, is used to test the effect of temperature on heart rate. 100 drosophila are obtained to perfect the experiment. 1. identify the independent variable. wrong answer: drosophila the independent variable is what is changed or manipulated during the experiment. -what is wrong with this answer? -what is a more correct answer? 2. identify the dependent variable. wrong answer: the temperature the dependent variable is the results of the experiment. -why is this wrong? -what is more correct? 3. state a potential hypothesis. wrong answer: the temperature will change the heart rate. hypothesis needs to have an if/then statement that makes a specific prediction. -how can we create a more accurate hypothesis? 4. describe how the control group will be treated differently than the experimental group. wrong answer: the control group is different. the control group has to get the normal or usual condition for comparison. -how can this be made more correct? 5. identify one factor that should remain constant in all groups. wrong answer: the temperature or heart rate constant factors remain the same in both groups. -what are factors that need to remain constant?

Explanation:

Step1: Analyze independent variable

Drosophila is the subject, not the variable being manipulated. The independent variable is temperature as it is what is changed in the experiment.

Step2: Analyze dependent variable

The dependent variable is the result that depends on the independent variable. So the heart - rate of drosophila is the dependent variable as it is affected by temperature.

Step3: Analyze hypothesis

A more accurate hypothesis could be: If the temperature increases, then the heart - rate of drosophila will increase.

Step4: Analyze control group

The control group of drosophila should be kept at a normal or room temperature (a specific, constant temperature), while the experimental group is exposed to different temperatures.

Step5: Analyze constant factors

Factors like the type of food given to drosophila, the humidity of the environment, the age of drosophila should remain constant. For example, all drosophila should be given the same type of food.

Answer:

1. What's wrong: Drosophila is the subject, not the variable being changed. More correct answer: Temperature.
2. Why it's wrong: Temperature is the independent variable, not the dependent one. More correct answer: The heart - rate of drosophila.
3. More accurate hypothesis: If the temperature increases, then the heart - rate of drosophila will increase.
4. More correct description: The control group of drosophila should be kept at a normal or room temperature (a specific, constant temperature), while the experimental group is exposed to different temperatures.
5. Factors that need to remain constant: The type of food given to drosophila, the humidity of the environment, the age of drosophila (one example could be the type of food).