Identifying Variables in Scientific Experiments

The video tutorial explains the concept of variables in scientific experiments, focusing on independent, dependent, and controlled variables. It provides examples to illustrate how these variables are identified and manipulated in experiments, such as plant and fish growth studies. The importance of controlling variables to ensure valid and fair tests is emphasized.

What is a variable in the context of an experiment?

• A hypothesis that needs to be tested

• A tool used to measure results

• A factor that can affect the outcome of an experiment

• A constant factor that does not change

Which type of variable is chosen to be manipulated in an experiment?

• Random variable

• Controlled variable

• Dependent variable

• Independent variable

In the example of heating water, what is the dependent variable?

• Final temperature of water

• Amount of water

• Initial temperature of water

• Time spent heating

Why are controlled variables important in an experiment?

• To ensure the experiment is valid and fair

• To increase the number of variables

• To make the experiment more complex

• To change the outcome of the experiment

Which of the following is an example of a controlled variable?

• Time spent heating

• Growth rate of a plant

• Type of soil used

• Final temperature of water

In the plant growth experiment, what is the independent variable?

• Type of soil

• Amount of sunlight

• Temperature

• Volume of water

What is the dependent variable in the plant growth experiment?

• Type of plant

• Type of soil

• Maximum height of the plant after one month

• Amount of water

In the fish growth experiment, what is initially chosen as the independent variable?

• Type of fish feed

• Temperature of water

• Type of water

• Frequency of feeding

What is the dependent variable in the fish growth experiment?

• Length of the fish after one month

• Temperature of water

• Type of fish feed

• Frequency of water change

If the temperature of water is chosen as the independent variable in the fish growth experiment, what becomes a controlled variable?

• Length of the fish

• Type of fish feed

• Water temperature

• Type of fish