Scientific Method

A possible explanation to a problem that has not yet been tested.

• data

• theory

• hypothesis

• fact

In a controlled experiment, how many independent variables can be worked with at a time?

• one

• none

• two or more

• how ever many makes sense.

When experimenting with the growth of a plant, a scientist uses three (of the same type of) plants, two different fertilizers, equal light, and equal water. What type of variable is the fertilizer?

• Dependent
• Independent
• Control
• Compound

An experiment is performed on plants to see how different liquids affect plant growth. Each plant in the experiment is given a different liquid; water, apple juice, or milk. Each plant has the same amount of soil, sunlight, and listens to the same music. In this investigation, what is the dependent variable?

• Type of plant
• Water, apple juice, milk
• Plant growth
• Color of the plant's leaves

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

Why do we want to test only one independent variable at a time?

• Because it is hard to setup a data table with more than one variable
• To better identify what is causing the changes
• It is what has always been done
• It's easier to perform the experiment

According to the diagram, which question is being tested?

• Do plants grow taller when watered with salt water?
• How much fertilizer do plants need?
• Does fertilizer make plants grow taller?
• What is the best fertilizer to use?

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

An experiment is performed on plants to see how different liquids affect plant growth. Each plant in the experiment is given a different liquid; water, apple juice, or milk. Each plant has the same amount of soil, sunlight, and listens to the same music. In this investigation, what is the independent variable?

• Type of plant
• Water, apple juice, milk
• Plant growth

Tags

NGSS.MS-LS2-1

Trainers normally uses praise as a reward to train his dog. They wants to know the best way to train his dog, so they sets up an experiment to find out if there is a better way to get the dog to respond to commands. What is the dependent variable?

• Type of reward
• Praise
• Type of dog
• Amount of time the dog follows commands

This group in an experiment does not change anything in the experimental group is the _______________.

• Independent variable
• Dependent variable
• Control group
• constant

Mario studied how far room temperature water would spurt out of a plastic milk carton when 3mm holes were punched at different heights from the bottom of the container. Identify the dependent variable

• 3 mm holes
• distance water traveled out of carton
• different heights of holes in container
• ice water from Iceland