Understanding Controlled Experiments

What is the main purpose of conducting a controlled experiment?

• To test multiple variables at once

• To prove a theory without any data

• To observe natural phenomena without interference

• To confirm a hypothesis by controlling all variables except one

In the plant experiment, what is the independent variable?

• The size of the pots

• The fertilizer applied

• The type of plant used

• The amount of sunlight

Why is it important to keep all conditions the same except for the independent variable in a controlled experiment?

• To ensure the experiment is quick

• To isolate the effect of the independent variable

• To make the experiment more complex

• To reduce the cost of the experiment

How can you determine if the fertilizer was effective in the experiment?

• By checking the soil quality

• By observing the color of the plants

• By measuring the growth of both plants over time

• By counting the number of leaves

What is the dependent variable in the plant growth experiment?

• The type of fertilizer

• The growth of the plants

• The amount of water

• The temperature of the environment