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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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1. Test

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

Which sequence shows organization from simplest to most complex?

Please select an answer first.

Correct answer: A

The correct answer is Cell, tissue, organ, organ system, organism.

  1. Identify the body system: Determine which organ or system performs the function described in the question.
  2. Connect structure and function: Cells form tissues, tissues form organs, organs work in organ systems, and systems support an organism.
  3. Check the interaction: Consider how the system works with other systems to keep the organism alive and balanced.

Cells form tissues, tissues form organs, organs work in organ systems, and systems support an organism.

2. QuestionMultiple choice

What is the main benefit of specialized cells in a multicellular organism?

Please select an answer first.

Correct answer: B

The correct answer is Different cells can perform different functions efficiently..

  1. Identify the body system: Determine which organ or system performs the function described in the question.
  2. Connect structure and function: Cell specialization allows an organism to divide complex life processes among many cell types.
  3. Check the interaction: Consider how the system works with other systems to keep the organism alive and balanced.

Cell specialization allows an organism to divide complex life processes among many cell types.

3. QuestionMultiple choice

Which structure is an organ?

Please select an answer first.

Correct answer: C

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 contains different tissues that work together to pump blood.
  3. Check the interaction: Consider how the system works with other systems to keep the organism alive and balanced.

The heart contains different tissues that work together to pump blood.

4. QuestionMultiple choice

Which example is an organ system?

Please select an answer first.

Correct answer: D

The correct answer is The respiratory system.

  1. Identify the body system: Determine which organ or system performs the function described in the question.
  2. Connect structure and function: The respiratory system includes organs and passages that work together for gas exchange.
  3. Check the interaction: Consider how the system works with other systems to keep the organism alive and balanced.

The respiratory system includes organs and passages that work together for gas exchange.

5. QuestionMultiple choice

Why do organs in an organ system work together?

Please select an answer first.

Correct answer: A

The correct answer is Their coordinated functions help complete an important life process..

  1. Identify the body system: Determine which organ or system performs the function described in the question.
  2. Connect structure and function: An organ system depends on coordinated organs to carry out a larger function.
  3. Check the interaction: Consider how the system works with other systems to keep the organism alive and balanced.

An organ system depends on coordinated organs to carry out a larger function.

6. QuestionMultiple choice

What is an organism?

Please select an answer first.

Correct answer: B

The correct answer is An individual living thing that carries out all necessary life processes.

  1. Identify the body system: Determine which organ or system performs the function described in the question.
  2. Connect structure and function: An organism is a complete living individual, whether it has one cell or many cells.
  3. Check the interaction: Consider how the system works with other systems to keep the organism alive and balanced.

An organism is a complete living individual, whether it has one cell or many cells.

7. QuestionMultiple choice

Which feature is common to all living organisms?

Please select an answer first.

Correct answer: C

The correct answer is They use energy and carry out life processes..

  1. Identify the body system: Determine which organ or system performs the function described in the question.
  2. Connect structure and function: Living things need energy and perform life functions, although the structures may differ.
  3. Check the interaction: Consider how the system works with other systems to keep the organism alive and balanced.

Living things need energy and perform life functions, although the structures may differ.

8. QuestionMultiple choice

What is homeostasis?

Please select an answer first.

Correct answer: D

The correct answer is Maintaining relatively stable internal conditions.

  1. Identify the body system: Determine which organ or system performs the function described in the question.
  2. Connect structure and function: Homeostasis keeps internal conditions within ranges that support life.
  3. Check the interaction: Consider how the system works with other systems to keep the organism alive and balanced.

Homeostasis keeps internal conditions within ranges that support life.

9. QuestionMultiple choice

Which example shows homeostasis?

Please select an answer first.

Correct answer: A

The correct answer is Sweating helps cool the body when its temperature rises..

  1. Identify the body system: Determine which organ or system performs the function described in the question.
  2. Connect structure and function: Sweating is a response that helps return body temperature toward a stable range.
  3. Check the interaction: Consider how the system works with other systems to keep the organism alive and balanced.

Sweating is a response that helps return body temperature toward a stable range.

10. QuestionMultiple choice

Why must body systems communicate?

Please select an answer first.

Correct answer: B

The correct answer is They need to coordinate their actions and respond to changes in the organism..

  1. Identify the body system: Determine which organ or system performs the function described in the question.
  2. Connect structure and function: Communication allows systems to work together and maintain internal balance.
  3. Check the interaction: Consider how the system works with other systems to keep the organism alive and balanced.

Communication allows systems to work together and maintain internal balance.

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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.