Unit 1 Science Test All

An experiment is being done to determine how light affects the growth of small zinnia plants. One plant is placed in full sunlight, the second in a shaded area, the third in an unlit closet. What is the independent variable in the experiment?

• the amount of light
• the type of plants
• the type of soil
• the length of the experiment

Mr. S. sets up an experiment to see how the mass of a ball affects the distance it rolls off a ramp.  Identify the independent variable.

• distance traveled by the ball
• height of the ramp
• mass of the ball
• weight of the ball

• the independent variable is distance
• the independent variable is d=25 t
• the dependent variable is time
• the dependent variable is distance

On a graph, which axis shows the dependent variable?

• x-axis
• y-axis
• neither
• it changes

During a controlled experiment, a scientist isolates and tests...

• a conclusion.
• a mass of information.
• a control group.
• a single variable.

A scientific hypothesis...

• can be based on personal beliefs or opinions.
• can be tested by experiments or observations.
• does not have to be tested to be accepted as correct.
• is a proven fact with much evidence to support it.

Based on your observations, you suggest that the presence of water could accelerate the growth of bread mold. This is...

• a conclusion.
• a hypothesis.
• an experiment.
• an analysis.

Information gathered from observing a plant grow 3 cm over a two-week period is called...

• inferences.
• variables.
• hypotheses.
• data.

16. Four students were working on an experiment with baking soda. Over three trials, the students were required to take the mass of the baking soda. What is the average amount of baking soda used during trial 3?

• 0.4475 g
• 0.440 g
• 1.79 g
• 0.460 g

14. A student sets up an experiment with two plants that are each exactly five inches tall. One is given fertilizer and the other is not. After 4 weeks their height is measured again. What is wrong with this experiment?

• Plants naturally grow at different rates. More trials need to be done.
• Plants grow slowly. The time frame is too short.
• There is no control for this experiment.
• The plants need to be taller to get accurate measurements.