Scientific methods and Microscopes

An explanation for a broad range of observations, facts, and tested hypotheses is called a........

• theory

• hypothesis

• law

• conclusion

Which of the following is a rule for handling animals used in research?

• a. Squeeze and play with the animals.

• b. Bring animals from the wild into your classroom.

• c. Pick up the animals the way your teacher tells you to.

• d. Only handle animals that are dead.

Before starting a science activity you should always

• a.read all the instructions very carefully.

• b.put on an apron.

• c.ask your friend what to do.

• d.get ready to do first aid.

Which of the following is NOT a step you should take after an accident?

• a.Secure the area.

• b.Assist your teacher.

• c.Keep quiet about the accident.

• d.Remain calm.

What is the first step in a scientific investigation?

• a.asking questions

• b.making observations

• c.drawing a conclusion

• d.doing research

Why do scientists communicate their results in written reports?

• a.so other scientists will argue

• b.because they like to write

• c.to make scientific models

• d.so other scientists can repeat their experiments

Q7. Which is a step of scientific methods?

• a.analyzing results

• b.stating a theory

• c.using technology

• d.building a microscope

Q8. What is the only difference between the control group and the experimental groups in a controlled experiment?

• a.the test

• b.the prediction

• c.the independent variable

• d.the hypothesis

Q9. Which describes a compound light microscope?

• a.It passes electrons through something to make a 3-D image.

• b.It passes electrons through something to make a flat image.

• c.It sends electromagnetic waves through the body to make images.

• d.It uses lenses to magnify small objects so they can be seen.

Use the information in the graph to answer the following questions

What question did the scientists who collected this data want to answer?

• a.Are there more earthworms in the soil in the spring or in the fall?

• b.What is the effect of plowing soil on the number of earthworms?

• c.How is the size of earthworms affected by the seasons?

• d.Does plowing soil affect how fast earthworms grow?