Year 3 - Science
Animals without bones
Introduction to the human skeleton and muscles
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This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
This unit explores the role of skeletons and muscles in humans and other animals for support, protection, and movement. It involves setting up practical enquiries, making observations, measuring accurately, recording findings, and using results to draw conclusions and suggest improvements.
Lesson Summary
You will learn to compare and group invertebrate animals, based on the structure of their bodies.
Key Notes
- Some animals do not have any bones.
- Animals that do not have bones, including a spine, inside their bodies are called invertebrates.
- Some invertebrate animals have a hard layer or shell for protection on the outside of their bodies called an exoskeleton
- Some invertebrate animals' bodies are filled with fluid, such as worms and jellyfish.
Vocabulary To Learn
- invertebrates: Animals that do not have bones, including a spine, on the inside of their bodies are invertebrates.
- spine: The backbone of an animal is also called its spine.
- exoskeleton: An exoskeleton is the hard outer layer that covers, supports, and protects the body of an invertebrate.
- compare: We compare things by looking at what is the same and what is different.
- fluid: A fluid is a gas or liquid that moves freely.
Common Mistakes To Avoid
- Pupils may believe if an animal has a head, extremities and an external skeleton it is a vertebrate.
3 Quick Questions (With Answers)
1. Explain the scientific idea in this lesson using two key points.
Some animals do not have any bones. Animals that do not have bones, including a spine, inside their bodies are called invertebrates.
2. Define this scientific word and use it in context. 'invertebrates'
Animals that do not have bones, including a spine, on the inside of their bodies are invertebrates. Include the word in a full scientific explanation, not as a single label.
3. Correct this common scientific misunderstanding.
Mistake: Pupils may believe if an animal has a head, extremities and an external skeleton it is a vertebrate. Correction: Share images of lots of animals with exoskeletons and compare them to a knight that puts on armour to protect themselves from injury.
More Lessons In This Unit
- Animal skeletons Study Guide
- Bone length: plan and do Study Guide
- Bone length: review Study Guide
- Improving muscle strength (non-statutory) Study Guide
- Muscle strength: do and review (non-statutory) Study Guide
- Muscle strength: plan (non-statutory) Study Guide
- Muscles for movement Study Guide
- The human skeleton: protection Study Guide
- The human skeleton: support Study Guide
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