Scientific Investigation

Crabs eat snails, and snails eat algae. Jane wants to determine whether the presence of a crab affects how much algae the snails will eat. She places algae and snails in 6 buckets, then adds a large crab to 3 of them. After 2 weeks, she measures the remaining weight of algae in each bucket. What is the dependent variable in Jane’s experiment?

• presence of crab

• amount of food

• size of crab

• amount of snails

Crabs eat snails, and snails eat algae. Jane wants to determine whether the presence of a crab affects how much algae the snails will eat. She places algae and snails in 6 buckets, then adds a large crab to 3 of them. After 2 weeks, she measures the remaining weight of algae in each bucket. What is the control in Jane’s experiment?

• Buckets with crab

• Buckets without crab

• size of crab

• amount of snails

Crabs eat snails, and snails eat algae. Jane wants to determine whether the presence of a crab affects how much algae the snails will eat. She places algae and snails in 6 buckets, then adds a large crab to 3 of them. After 2 weeks, she measures the remaining weight of algae in each bucket. What is the dependent variable?

• size of crab

• weight of algae

• weight of snails

• amount of snails

A student conducted an experiment to test the movement of a marble through four different liquid substances. Looking at the figure designed by the student, what is an error in his experiment?

• The amount of liquid substances used is not consistent.

• The type of marble used is not consistent.

• The type of liquid substances are not labeled correctly.

• The marbles are not dropped from the same distance.

Researchers are able to have strict control of variables in a _______________ experiment.

• field

• natural

• laboratory

• university

What is a logical prediction about what will happen and why during the experiment? This comes before the experiment.

• Hypothesis

• Theory

• Investigation

• Dependent variable

People during the Scientific Revolution started to make conclusions based on?

• Traditional ideas

• Experimentation and Observation

Francis Bacon argued that the truth could not be known at the beginning of a question, but only at the end after a long process of?

• investigation

• waiting

• conspiring

• formulating

What is the first step in the scientific method that involves identifying a problem or question?

• Observation

• Hypothesis

• Experimentation

• Conclusion

Which of the following is a systematic approach to solving a problem or answering a question in science?

• Scientific Method

• Trial and Error

• Guesswork

• Speculation