Question

4 what are the two controlled variables in her experiment?

1. list any other factors that might affect strawberry production that should be controlled in her experiment.
2. what is meant by fair test?

challenge problem: anabelles story says that if she has never given her strawberry plants food before she should not start giving them any during her experiment why do you think this is?

Explanation:

1. Controlled variables are factors kept the same in an experiment. Without details of her experiment, examples could be soil type and amount of sunlight.
2. Other factors could include temperature, watering frequency, presence of pests, and type of fertilizer (if applicable).
3. A fair test means only one variable is changed at a time while all other factors are kept constant to accurately determine the effect of the changed variable.

For the challenge problem, starting to give food during the experiment would introduce a new variable. This could confound results as it's unclear if any changes in strawberry production are due to the variable being tested or the new - introduced food.

Answer:

1. Examples: Soil type, amount of sunlight.
2. Temperature, watering frequency, presence of pests, type of fertilizer.
3. Only one variable is changed while others are constant.

Challenge Problem: Introducing food as a new variable could confound results.