Science Experiment Validity Quiz

When new evidence from experiments is presented, how do other scientists make sure that it is correct?

• Other scientists accept the experiment if it fits in with the theory

• Other scientists accept the evidence if the evidence is good and has been proven only once

• Other scientists try to replicate the experiment and try to get the same results

• Other scientists accept the evidence if the experiment was performed only 10 times by 1 person

Ryan thinks salt will dissolve faster than sugar in water regardless of the temperature. Ryan decides to test this. He fills 8 beakers up with water. One beaker is kept at room temperature, one beaker is warm, one beaker is boiling on a hot plate, and the last beaker is cold water. Ryan adds the same amount of sugar and salt in each of the beakers with different temperatures, stirs them the same amount of times, and then filters out the sugar and salt to see which was dissolved faster. What would help Ryan improve the validity of the results?

• Adding a control group

• Repeating the experiment more than once

• Add another variable

• Create a hypothesis

Which statement explains the difference between a theory and a law?

• Theories can become laws but laws cannot become theories

• Laws change as new technologies are developed

• A theory is an explanation of something in the natural world and a law is a description

• A theory is a description of something in the natural world and a law is an explanation

A theory and a law can share the same definitions.

• True

• False

What level of body organization does copying of DNA take place?

• Organ

• Organ system

• Tissue

• Cell

The heart is the main organ of what system: ______________________

If Planaria is cut in half, after 2 weeks each section will grow into a complete planarian. Which of the following represents the order the sections will grow back in?

• Organism > cells > tissue > organs

• Tissues > cells > organisms > organs

• Organs > tissue > cells > organisms

• Cells > tissues > organs > organism

Write the level of organization from simple to most complex (starting with cell):

When you exercise, your heart rate and respiration rate increases. Which level of organization does this occur?

• At the tissue level

• At the organ level

• At the system level

• At the cellular level

A key process common to all organisms is the ability to reproduce. Where do all cells come from?

• From thin air

• From rocks

• From outer space

• From pre-existing cells