Which of the following is the basic building block of living organisms?

• cell 
• organelle
• nucleus
• organ system

Tags

NGSS.MS-LS1-1

NGSS.MS-LS1-2

A student wants to study the organelles in a plant leaf. How can she see the organelles?

• Use special glasses. 
• Use only her eyes. 
• Use a hand lens
• Use a microscope. 

Jenee claims that students cannot see all of the parts of animals without a special tool. Is she correct? What evidence supports the claim?

• Jenee is wrong. All parts of animals can be seen with the unaided eye. 
• Jenee is wrong. You can see all the parts of animals without a tool. 
• Jenee is correct. When you look at an animal under a microscope, you can see smaller parts called cells.
• Jenee is correct. When you look at an animal under a microscope, you can see smaller parts called particles

Tags

NGSS.MS-LS1-1

NGSS.MS-LS1-2

Look at the cell model. Which of the following is correct? 

• The model is an animal cell because it has a cell membrane, but no cell wall.
• The model is an animal cell because it has a nucleus.
• The model is a plant cell because it has a nucleus.
• The model is a plant cell because it has a cell membrane, but no cell wall.

Tags

NGSS.MS-LS1-2

Which structure is most likely represented by the grape?

• cell wall
• nucleus
• cytoplasm
• cell membrane

Tags

NGSS.MS-LS1-1

NGSS.MS-LS1-2

A student is making a model of a plant cell and an animal cell. Which of the following should only be included in the plant cell?

• nucleus
• chloroplast
• mitochondrion
• cell membrane

Tags

NGSS.MS-LS1-2

Mack claims that this cell must have come from a plant, but his friend Luna claims that it is definitely an animal cell. Who is correct?

• Mack is correct because he is the one looking at the cell.
• Mack is correct because the cell does not have a cell membrane. 
• Luna is correct because the cell has a nucleus. 
• Luna is correct because the cell does not have a cell wall. 

Tags

NGSS.MS-LS1-2

Which of the following observations would provide the best evidence that microorganisms are beneficial to the ecosystem of a pond?

• The number of microorganisms that live in a pond habitat can change over time
• Microorganisms live on the roots of some plants or inside the gut of some animals
• Microorganisms are found in many kinds of pond habitats with different temperatures and levels of rainfall.
• More plants and animals live and thrive in a pond with a higher concentration of microorganisms. 

Tags

NGSS.MS-LS2-2

NGSS.MS-LS2-4

A student claims that microorganisms are helpful to the surrounding ecosystems. Which evidence supports the student's claim?

• Millions of microorganisms can often be found in soil.
• Microorganisms are too small to be seen without special equipment. 
• Like all living things, microorganisms need water and energy. 
• Microorganisms break down dead plants and animals, making nutrients available

Which evidence supports the claim that a certain microorganism can be harmful to a pond ecosystem? 

•  Microorganisms are too small to be seen without special equipment.
• The number of plants and animals in the pond decreased when the microorganism was introduced.
• The number of plants and animals in the pond increased when the microorganism was introduced.
• Microorganisms are found in many kinds of pond habitats with different temperatures. 

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4