Judy took some dead grass and soaked it in water for a few days.

Then, she looked at it under a microscope.

She saw some tiny things moving around under the microscope.

How could Judy tell whether what she was looking at were living things?

Select two of the following that could be used to decide whether the things Judy saw were living.

• They were too small to see without a microscope.

• The number of tiny things increased.

• They consumed smaller things floating in the water.

• 
  The things were too tiny to be living.

Tags

NGSS.MS-LS1-1

Which of these could be caused by a single-celled organism?

• Joe mixed baking soda and vinegar, and it started to bubble.

• Mikayla left the milk out overnight, and it smelled sour the next day.

• Jenny put sugar into some iced tea and stirred it until she could not see the sugar anymore.

Ana wanted to know what happens to blood cells in the water when a shark attacks an animal in the ocean. She put red blood cells in salt water, since the water in the ocean is saltier than the fluid inside the cells. Afterward, she used a microscope to observe that the red blood cells had shrunk. Which part of the cell was most directly responsible for the shrunken appearance of the cell?

• cell membrane

• mitochondria

• nucleus

Tags

NGSS.MS-LS1-2

Select all the things that are true for both single-celled organisms and cells that are part of a multi-celled organism.

• grow

• reproduce

• use energy

• produce waste

Tags

NGSS.MS-LS1-1

Which of the following activities requires you to use energy?

• sleeping

• running to catch the bus

• watching the television

Tags

NGSS.MS-PS3-5

If a person could not digest food anymore, what would most likely happen to that person?  Why?

• The person would gain weight because the undigested food would sit in the person's body.

• The person would not lose or gain weight, but it would take longer for the body to use the food that was eaten.

• The person would lose weight because most of the molecules from food could not be used for building proteins.

Tags

NGSS.MS-LS1-7

What is the connection between oxygen and food?

• Oxygen is needed for survival just like food.

• Oxygen is not used to help break food down into smaller particles.

• Oxygen is used in the chemical reaction that releases energy from food.

Tags

NGSS.MS-LS1-7

When does diffusion occur while you are digesting food?

• when food is broken down inside the stomach

• when food breaks down into smaller pieces inside your mouth

• when food molecules go into cells

Tags

NGSS.MS-LS1-7

When someone is exercising, which is most likely a function of both the circulatory and respiratory systems?

• to help the body sweat

• 
  to make the muscles work

• to provide oxygen to the body

One day, Talia started monitoring her pulse rate and breathing. She noticed her pulse and breathing increased during her dance practice. After practice, she stretched, drank lots of water, and relaxed. She noticed that her pulse and breathing returned to what it was before class. Why did this happen?

• Stretching helped her muscles relax and her breathing to calm down.

• Her body returned to its normal pulse rate and breathing rate after her energy needs decreased.