Levels of Organization Intro

Sage drew a diagram to describe the levels of structural organization of an animal’s body. Sage will list

the cell at the bottom of the pyramid as both the least specialized and the most numerous.

Which of these should Sage list in Level 1 of the diagram?

• organ

• tissue

• organism

• organ system

Tags

NGSS.MS-LS1-1

Examine the model representing levels of organization in living things.

Which of these best represents the next level of the model?

• 
• 
• 
• 

Tags

NGSS.MS-LS1-1

NGSS.MS-LS1-2

NGSS.MS-LS1-3

Examine the two main parts of the human body’s central nervous system.

According to the diagram, which term BEST describes the brain?

• cell

• organ

• tissue

• organ system

The illustration shows an example of the levels of structural organization in living things.

Which of these BEST completes the diagram?

• blood

• intestines

• a human body

• the circulatory system

Tags

NGSS.MS-LS1-3

​ ​ ​ ​ ​

There are four basic levels of structural organization in a plant. The smallest, most numerous structures

are _​ (a)   _. They can be considered the first level. These group together to form _​ (b)   _

which carry out certain functions. The third organizational level is a grouping of structures in the second

level into _ (c)   _ to perform a specific task. The final and most complex level, which

incorporates the structures of the three previous levels to perform a series of tasks, is _​ (d)   _.

• cells
• tissues
• organs
• organ systems
• leaves
• roots

Tags

NGSS.MS-LS1-1

NGSS.MS-LS1-2

Lisa and Ben used a diagram to show some

structures of a plant.

Develop a model of the organization levels of

the plant structures. Write the letter of ONE

correct answer in each box.

a

b

c

d

e

f

Root System

Dermal Tissue

Leaf

Shoot System

Epidermal Cells

Stem

Structures of the human body are organized for different functions. What are some effects of structures working together?

Write the letter of ONE phrase in each box to BEST complete the sentences.

a

b

c

d

to cool a body during exercise.

when muscle tissue moves an arm.

when brain sends and receives messages

when digestive system breaks down food

Tags

NGSS.MS-LS1-2

NGSS.MS-LS1-3