Levels of Organization in Biology

What is the smallest unit of life in the body?

• Tissue

• Cell

• Organ

• Organ system

Which of the following is an example of a tissue?

• Heart

• Skin

• Red blood cell

• Nervous system

Which level of organization is made up of a group of similar cells performing a specific function?

• Organ

• Tissue

• Organ system

• Organism

Which level of organization includes organs working together?

• Cell

• Tissue

• Organ system

• Organism

What level of organization is represented by the human body as a whole?

• Organ system

• Tissue

• Organism

• Cell

Which of the following is an example of an organ system?

• Heart

• Digestive system

• Muscle

• Skin

The stomach is an example of which level of organization?

• Organ

• Cell

• Tissue

• Organ system

Which term describes a group of organs that work together to perform complex functions?

• Tissue

• Organ system

• Cell

• Organ

What level of organization is the brain classified under?

• Organ

• Tissue

• Cell

• Organ system

Which of the following is the correct order of levels of organization from simplest to most complex?

• Cell, organ, tissue, organism, organ system

• Cell, tissue, organ, organ system, organism

• Organism, organ system, organ, tissue, cell

• Tissue, cell, organ, organism, organ system