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Which of the following is the best definition of a hypothesis in science?
An educated guess that is measurable and testable
Write a hypothesis using the correct format: (Scenario: You are testing whether the type of liquid—water, soda, or juice—affects how tall bean plants grow in 3 weeks.)
If a plant is given water, soda or juice, the plant will grow the tallest in water.
You want to test if the amount of sunlight affects the number of tomatoes a plant produces. What is the independent variable?
The amount of sunlight
You want to test if the amount of sunlight affects the number of tomatoes a plant produces. What is the dependent variable?
Number of tomatoes a plant produces
You want to test if the amount of sunlight affects the number of tomatoes a plant produces. What should be kept constant?
Type of plant, amount of soil and water
A student tests whether temperature affects how quickly sugar dissolves in water. What is the independent variable?
temperature
A student tests whether temperature affects how quickly sugar dissolves in water. What is the dependent variable?
Time it takes to dissolve
Why are constant variables important in an experiment?
They keep the experiment results reliable.
You are creating a graph for an experiment testing whether the amount of water (20 ml, 40 ml, 60 ml ) affects plant height (cm). What would be a good title for the graph?
Does the amount of water given to a plant affect its growth?
You are creating a graph for an experiment testing whether the amount of water (20 ml, 40 ml, 60 ml ) affects plant height (cm). What should go on the x-axis (horizontal)?
Amount of water
You are creating a graph for an experiment testing whether the amount of water (20 ml, 40 ml, 60 ml ) affects plant height (cm). What should go on the y axis (vertical)
Plant growth in centimeters
You are testing how different types of paper airplanes (construction paper, notebook paper, cardboard) affect how far they fly. What is the independent variable?
Type of material
You are testing how different types of paper airplanes (construction paper, notebook paper, cardboard) affect how far they fly. What is the dependent variable?
Distance the plane travels
You are testing how different types of paper airplanes (construction paper, notebook paper, cardboard) affect how far they fly. What in one constant in the experiment?
The way the plane is constructed
True/False - Your experiment is reliable if you change more than one thing. Explain your reasoning.
False
Write a hypothesis using the information provided. Independent variable: the amount of water given to a plant (15 ml, 20 ml, 25 ml) Dependent variable: the plant's growth in cm
If a plant is given 15ml, 20 ml and 25 ml, the the plant will grow the tallest in 25 ml of water because plants need water to grow.
