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Grade 6 Science · Organisms and Body Systems

Grade 6 Organisms and Body Systems Practice Test

Build Grade 6 Science skills with five 10-question practice tests on levels of organization, body systems, circulation, respiration, digestion, the nervous system, movement, immunity, and homeostasis.

Organisms and Body Systems Practice Tests

These Grade 6 Science practice tests help students understand how cells, tissues, organs, organ systems, and organisms are organized. Students practice the functions and interactions of the circulatory, respiratory, digestive, nervous, skeletal, muscular, urinary, and immune systems.

Skills covered

  • Explaining levels of organization in multicellular organisms
  • Connecting organs and systems with their functions
  • Describing circulation, respiration, digestion, and waste removal
  • Understanding nervous system responses and body movement
  • Explaining immune defenses and homeostasis
  • Analyzing how body systems depend on one another

How to use these practice tests

For each question, identify the function first and then match it to the organ or system that performs it. Study body systems as connected networks: oxygen and nutrients move through the circulatory system, signals coordinate responses, and several systems work together to maintain homeostasis.

For more Grade 6 Science practice, return to the Grade 6 Science category.

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Grade 6 Organisms and Body Systems Practice Tests

A 10-question Grade 6 Science practice test on levels of organization, body systems, circulation, respiration, digestion, the nervous system, movement, immunity, and homeostasis.

Identify the system responsible for each function, connect organs with their roles, and explain how body systems interact to maintain life and balance.

10 Questions
0/10 Questions0 %
Correct 0
Incorrect 0
Unanswered 10
1. QuestionMultiple choice

What is the main function of the circulatory system?

Please select an answer first.

Correct answer: A

The correct answer is To transport blood, oxygen, nutrients, and wastes through the body.

  1. Identify the body system: Determine which organ or system performs the function described in the question.
  2. Connect structure and function: The circulatory system moves materials between body parts through the heart, blood, and blood vessels.
  3. Check the interaction: Consider how the system works with other systems to keep the organism alive and balanced.

The circulatory system moves materials between body parts through the heart, blood, and blood vessels.

2. QuestionMultiple choice

Which organ pumps blood through the body?

Please select an answer first.

Correct answer: B

The correct answer is The heart.

  1. Identify the body system: Determine which organ or system performs the function described in the question.
  2. Connect structure and function: The heart is a muscular organ that contracts to move blood through vessels.
  3. Check the interaction: Consider how the system works with other systems to keep the organism alive and balanced.

The heart is a muscular organ that contracts to move blood through vessels.

3. QuestionMultiple choice

What is the function of red blood cells?

Please select an answer first.

Correct answer: C

The correct answer is They carry oxygen to body cells..

  1. Identify the body system: Determine which organ or system performs the function described in the question.
  2. Connect structure and function: Red blood cells contain a protein that helps transport oxygen in the blood.
  3. Check the interaction: Consider how the system works with other systems to keep the organism alive and balanced.

Red blood cells contain a protein that helps transport oxygen in the blood.

4. QuestionMultiple choice

What do blood vessels do?

Please select an answer first.

Correct answer: D

The correct answer is They provide pathways for blood to travel through the body..

  1. Identify the body system: Determine which organ or system performs the function described in the question.
  2. Connect structure and function: Arteries, veins, and capillaries form a network that carries blood throughout the body.
  3. Check the interaction: Consider how the system works with other systems to keep the organism alive and balanced.

Arteries, veins, and capillaries form a network that carries blood throughout the body.

5. QuestionMultiple choice

How does the circulatory system work with the respiratory system?

Please select an answer first.

Correct answer: A

The correct answer is It carries oxygen from the lungs to cells and returns carbon dioxide to the lungs..

  1. Identify the body system: Determine which organ or system performs the function described in the question.
  2. Connect structure and function: The two systems cooperate to transport oxygen and remove carbon dioxide.
  3. Check the interaction: Consider how the system works with other systems to keep the organism alive and balanced.

The two systems cooperate to transport oxygen and remove carbon dioxide.

6. QuestionMultiple choice

What is the main function of the respiratory system?

Please select an answer first.

Correct answer: B

The correct answer is To bring oxygen into the body and remove carbon dioxide..

  1. Identify the body system: Determine which organ or system performs the function described in the question.
  2. Connect structure and function: Breathing and gas exchange supply oxygen and remove carbon dioxide.
  3. Check the interaction: Consider how the system works with other systems to keep the organism alive and balanced.

Breathing and gas exchange supply oxygen and remove carbon dioxide.

7. QuestionMultiple choice

Where does most gas exchange occur in the lungs?

Please select an answer first.

Correct answer: C

The correct answer is In tiny air sacs surrounded by capillaries.

  1. Identify the body system: Determine which organ or system performs the function described in the question.
  2. Connect structure and function: Tiny air sacs provide a large surface for oxygen and carbon dioxide to move between air and blood.
  3. Check the interaction: Consider how the system works with other systems to keep the organism alive and balanced.

Tiny air sacs provide a large surface for oxygen and carbon dioxide to move between air and blood.

8. QuestionMultiple choice

What is the function of the diaphragm during inhalation?

Please select an answer first.

Correct answer: D

The correct answer is It contracts and moves downward, helping expand the chest cavity..

  1. Identify the body system: Determine which organ or system performs the function described in the question.
  2. Connect structure and function: When the diaphragm contracts downward, pressure changes draw air into the lungs.
  3. Check the interaction: Consider how the system works with other systems to keep the organism alive and balanced.

When the diaphragm contracts downward, pressure changes draw air into the lungs.

9. QuestionMultiple choice

Why does breathing rate increase during exercise?

Please select an answer first.

Correct answer: A

The correct answer is Working muscles need more oxygen and produce more carbon dioxide..

  1. Identify the body system: Determine which organ or system performs the function described in the question.
  2. Connect structure and function: The respiratory and circulatory systems respond to the increased demands of active muscles.
  3. Check the interaction: Consider how the system works with other systems to keep the organism alive and balanced.

The respiratory and circulatory systems respond to the increased demands of active muscles.

10. QuestionMultiple choice

Which path shows air moving into the respiratory system?

Please select an answer first.

Correct answer: B

The correct answer is Nose or mouth, trachea, bronchi, lungs.

  1. Identify the body system: Determine which organ or system performs the function described in the question.
  2. Connect structure and function: Air travels through the airways before reaching the lungs for gas exchange.
  3. Check the interaction: Consider how the system works with other systems to keep the organism alive and balanced.

Air travels through the airways before reaching the lungs for gas exchange.

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Frequently asked questions about Grade 6 Organisms and Body Systems

What topics are covered?

The page covers levels of organization, circulation, respiration, digestion, the nervous system, skeletal and muscular systems, immunity, urinary function, system interactions, and homeostasis.

How should students study body systems?

Match each system with its organs and functions, then review how systems exchange materials and information during activities such as exercise, digestion, and immune responses.

How many questions are on this page?

The page includes five mini tests with 10 questions each, for 50 Grade 6 Organisms and Body Systems questions in total.