7th Grade Unit 2 Review

Abigail read a newspaper article about a new scientific discovery. Which foundational concept of science would best help solve the problem described in the article?

• Science should be a blend of logic and innovation.

• Scientific ideas are durable yet must be subject to change as new data are collected.

• Scientists should believe that the natural world is understandable.

• Scientists should engage in peer review.

Which of the following best illustrates the evolving nature of scientific understanding?

• Scientific theories change when new evidence emerges.

• Only experimental data should be considered in scientific research.

• Scientific laws are permanent and unchangeable.

• Mathematical proof is the only way to validate scientific ideas.

Tags

NGSS.HS-LS4-1

What is the term for the statement: "An object in motion will remain in motion unless acted upon by an external force."

• Hypothesis

• Law

• Theory

• Experiment

Which term matches the example statement: "If a heavier bowling ball is used then it will hit more bowling pins than a light-weight ball of the same size."

• Hypothesis

• Law

• Theory

• Experiment

Tags

NGSS.HS-PS2-1

The Cell Theory is a theory because it—

• Explains natural phenomenon, is based upon a multitude of evidence, and is unlikely to change.

• Explains mathematically how nature will behave under certain specific conditions.

• Is not scientifically provable, and may or may not be correct.

• Is an educated guess that can be used to conduct a fair test called an experiment.

Which statements are true of the cell theory? Select all that apply.

• Cells are the fundamental unit of structure and function in all living organisms.

• All cells come from existing cells through cell division.

• All organisms are made up of one or more cells.

• Cells can perform photosynthesis to produce energy.

• Cells are visible only under a microscope.

Tags

NGSS.MS-LS1-1

What tool helped scientists prove that living things do not just appear randomly, challenging the old idea of spontaneous generation?

• The telescope

• The microscope

• The refrigerator

• Antibiotics

In a science classroom, students swab their cheeks to look at animal cells under a microscope. They then use onion skin to look at plant cells under a microscope. They discovered that while plant and animal cells have many similar structures, there are some differences. How does this classroom experiment connect to the greater body of scientific knowledge?

• The investigation shows how different tools provide different types of data that can be used to prove or disprove theories.

• The investigation confirms a mathematical law.

• The investigation helps confirm existing scientific knowledge about plant and animal cells.

• The experiment disproves previous studies about animal and plant cells.

Tags

NGSS.MS-LS1-1

This scientist most likely created this computer model of a cell —

• because his microscope was broken

• because E. coli bacteria are too small to be seen even with the aid of technology

• to make predictions about interactions between the cell and other systems

• to show that microscopes are no longer needed to study how cells work

Tags

NGSS.HS-ETS1-4

Using this model will likely—

• raise new questions and prompt further studies

• provide evidence that Cell Theory has been disproven

• demonstrate the difference between bacterial and human cells

• prove that cells are a part of all living organisms

Tags

NGSS.MS-LS1-1

NGSS.MS-LS1-2