Levels of Organization in Living Things

Unit 2: Levels of Organization in Living Things

Multiple Choice

What is the smallest functional part of a living thing?

• An atom

• A molecule

• A cell

• An organ

​Every living thing is a system that performs all of the processes needed for survival.

• ​Unicellular organisms are a system of only one cell.

• ​Multicellular organisms are a made up of multiple subsystems that work together.

Multiple Choice

Which statement best describes a system?

• Many parts working together to perform a function

• Any job an organism has to perform to stay alive.

Multiple Choice

What would be an example of a "subsystem" within a larger system?

• A fish tank

• A large forest

• The engine in a car

• An airplane

​Cells

• ​All living things are made up of cells.

• ​The cells of unicellular organisms can do all of the things needed for survival because they have organelles that perform different jobs.

• ​Multicellular organisms have many different types of cells that perform different roles in the body.

Multiple Choice

What advantage do multicellular organisms have over unicellular organisms? 

• Multicellular organisms can survive better than unicellular organisms.

• Multicellular organisms can do more complex things than unicellular organisms. 

• Unicellular organisms can get larger then multicellular organisms.

• Multicellular organisms are more dangerous than unicellular organisms.

​Because they have more than one type of cell, multicelluar organisms have more than one level of organization.

Multiple Select

Why don't unicellular organisms have more than one type of cell? (Check all that apply)

• They are able to perform all of life's essential process in one single cell. 

• They don't have to perform all of life's essential processes. 

• They don't have to perform all of the same types of activities that multicellular organisms have to. 

• They just like living a simple carefree life.

​Tissues

• ​Specialized cells are grouped together to form tissues.

• ​A TISSUE is a group of similar cells that are organized to perform a specific function.

• ​For example, a plant's vascular tissue is made up of cells that are small and hollow. They connect to each other to form tubes that carry water and nutrients throughout a plant. You can see these tissues as the "strings" in celery. .

​Organs

• ​Different types of tissues work together to form an ORGAN.

• ​For example, the stem of a plant is made up of vascular tissue that transports nutrients and water, ground tissue that provides support, and epidermal tissue that protects the outside of the stem.

Multiple Choice

What is the function of ground tissue?

• To transport water and nutrients

• To absorbe nutrients from the soil

• To perform photosynthesis

• To provide structure and support to the plant

Multiple Choice

Where is epidermal tissue found on a plant?

• The outer surfaces

• Deep inside the plant

• Inside of the roots

• Plants don't have epidermal tissue

Multiple Choice

In animals, which structures would function in a similar way to the plant's vascular tissue?

• the skeleton

• veins and arteries

• the skin

• fur and feathers

• ​In animals, blood vessels are considered organs because they're made of more than one type of tissue.

  • ​Epithelial tissue helps control the passage of blood cells.

  • ​Smooth muscle tissue helps control the diameter of the blood vessel.

  • ​Connective tissue is very tough and protects the outside of the blood vessel.

Multiple Select

What would be another type of ORGAN in the human body? (check all that apply)

• Brain

• Fingernail

• Hair

• Eye

​The brain and eyes are other organs in animals' bodies. They're organs because they are made of many different tissues so that they can perform complex jobs.

​Organ Systems

• ​An ORGAN SYSTEM is a group of organs that work together to perform important body functions.

• ​The leaves, stems, and flowers of a plant are all organs that make up the shoot system of a plant.

• ​Roots make up a different system below ground.

Multiple Choice

Why is a leaf considered an ORGAN in a plant? 

• Because it has an important job to perform for the plant. 

• Because it can photosynthesize.

• Because it is made of more than one type of tissue.

• Because plants have a lot of them.

Open Ended

How can one organ within an organ system affect how the entire organ system functions? 

• ​The heart and blood vessels in animals are organs that form the circulatory system. 

• ​These organs work together to move blood throughout the body. 

• ​If one organ isn't working properly, the entire organ system may be affected.

  • ​People with a heart disorder may have low blood pressure.

Multiple Choice

The stomach is a tissue in the digestive system

• True

• False

• Y

Multiple Choice

Which statement best explains why the stomach is an ORGAN and not a tissue?

• The stomach is smaller than the liver.

• A stomach is necessary for digestion of food.

• The stomach is made of more than one type of tissue.

• The stomach is made of one type of cell.

An organism can have many organ systems that work together to perform all the functions the organism needs to survive. 

Open Ended

How can one organ system affect how another organ system functions?