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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 primary function of the digestive system?

Please select an answer first.

Correct answer: A

The correct answer is To break food into nutrients that the body can absorb and use.

  1. Identify the body system: Determine which organ or system performs the function described in the question.
  2. Connect structure and function: Digestion breaks food into smaller substances that can enter the blood and support body functions.
  3. Check the interaction: Consider how the system works with other systems to keep the organism alive and balanced.

Digestion breaks food into smaller substances that can enter the blood and support body functions.

2. QuestionMultiple choice

Where does digestion begin?

Please select an answer first.

Correct answer: B

The correct answer is In the mouth.

  1. Identify the body system: Determine which organ or system performs the function described in the question.
  2. Connect structure and function: Chewing and saliva begin the mechanical and chemical breakdown of food in the mouth.
  3. Check the interaction: Consider how the system works with other systems to keep the organism alive and balanced.

Chewing and saliva begin the mechanical and chemical breakdown of food in the mouth.

3. QuestionMultiple choice

What is the role of the small intestine?

Please select an answer first.

Correct answer: C

The correct answer is It absorbs many nutrients from digested food..

  1. Identify the body system: Determine which organ or system performs the function described in the question.
  2. Connect structure and function: The small intestine has structures that provide a large surface for nutrient absorption.
  3. Check the interaction: Consider how the system works with other systems to keep the organism alive and balanced.

The small intestine has structures that provide a large surface for nutrient absorption.

4. QuestionMultiple choice

What is the main function of the large intestine?

Please select an answer first.

Correct answer: D

The correct answer is It absorbs water and forms solid waste..

  1. Identify the body system: Determine which organ or system performs the function described in the question.
  2. Connect structure and function: The large intestine removes water from the remaining material before waste leaves the body.
  3. Check the interaction: Consider how the system works with other systems to keep the organism alive and balanced.

The large intestine removes water from the remaining material before waste leaves the body.

5. QuestionMultiple choice

How does the digestive system work with the circulatory system?

Please select an answer first.

Correct answer: A

The correct answer is The circulatory system transports absorbed nutrients from the digestive tract 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: After nutrients are absorbed, blood carries them to cells that need them.
  3. Check the interaction: Consider how the system works with other systems to keep the organism alive and balanced.

After nutrients are absorbed, blood carries them to cells that need them.

6. QuestionMultiple choice

What is the main function of the nervous system?

Please select an answer first.

Correct answer: B

The correct answer is To receive information, process it, and coordinate responses..

  1. Identify the body system: Determine which organ or system performs the function described in the question.
  2. Connect structure and function: The brain, spinal cord, and nerves communicate information and help control the body.
  3. Check the interaction: Consider how the system works with other systems to keep the organism alive and balanced.

The brain, spinal cord, and nerves communicate information and help control the body.

7. QuestionMultiple choice

What is the role of the brain in the nervous system?

Please select an answer first.

Correct answer: C

The correct answer is It processes information and helps direct responses..

  1. Identify the body system: Determine which organ or system performs the function described in the question.
  2. Connect structure and function: The brain interprets information and coordinates many voluntary and involuntary activities.
  3. Check the interaction: Consider how the system works with other systems to keep the organism alive and balanced.

The brain interprets information and coordinates many voluntary and involuntary activities.

8. QuestionMultiple choice

What do nerves carry?

Please select an answer first.

Correct answer: D

The correct answer is Signals between the brain, spinal cord, and other parts of the body.

  1. Identify the body system: Determine which organ or system performs the function described in the question.
  2. Connect structure and function: Nerves transmit electrical and chemical messages throughout the nervous system.
  3. Check the interaction: Consider how the system works with other systems to keep the organism alive and balanced.

Nerves transmit electrical and chemical messages throughout the nervous system.

9. QuestionMultiple choice

How can the nervous system help a person respond to a hot surface?

Please select an answer first.

Correct answer: A

The correct answer is It detects the heat and coordinates a rapid movement away from the surface..

  1. Identify the body system: Determine which organ or system performs the function described in the question.
  2. Connect structure and function: Sensory information is detected and processed so muscles can respond quickly.
  3. Check the interaction: Consider how the system works with other systems to keep the organism alive and balanced.

Sensory information is detected and processed so muscles can respond quickly.

10. QuestionMultiple choice

Why are the digestive and nervous systems both important for body function?

Please select an answer first.

Correct answer: B

The correct answer is The digestive system supplies nutrients while the nervous system coordinates responses and activities..

  1. Identify the body system: Determine which organ or system performs the function described in the question.
  2. Connect structure and function: Body systems have different roles that work together to support the organism.
  3. Check the interaction: Consider how the system works with other systems to keep the organism alive and balanced.

Body systems have different roles that work together to support the organism.

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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.