Sense It, Work It Out, Do Something
A 55-minute Grade 4 lesson on modelling how animals receive information through their senses, process it and respond.
Sense It, Work It Out, Do Something is a free 55-minute Grade 4 science lesson plan for Common Core standard 4-LS1-2 — model how an animal senses something, works it out, and responds. It is timed across 5 sections, gives the exact wording to use where the wording carries the mathematics, names 3 misconceptions with the teaching move that addresses each, and ends with an exit ticket and a printable worksheet with its answer key.
- Grade:
- Grade 4
- Length:
- 55 minutes
- Standard:
- 4-LS1-2
Grade 4 · Life Science
4-LS1-2
Use a model to describe that animals receive different types of information through their senses, process the information in their brain, and respond to the information in different ways.
Objective
Students will be able to model the three stages from sense to response for a real animal behaviour.
Students are successful when they can
- Names the sense that received the information.
- Says where it is processed.
- Names the response and what it achieves.
What you need
- A reaction-time ruler drop, video of animal behaviour
- Three-box model cards: sense, process, respond
- The printable practice sheet linked at the end of this plan
The lesson
Warm-up
5 min- Run a ruler-drop reaction test in pairs.
- Ask what happened between seeing and catching.
Teach — three boxes, always
14 min- Fill the boxes for the ruler drop: eyes see, brain processes, hand closes.
- Do a rabbit hearing a fox: ears, brain, run.
- Ask what would happen if the middle box were missing. No sensible response.
- Do a plant for contrast and ask whether it has a brain. It responds without one.
- Do a hot-surface reflex and note the shortcut through the spinal cord.
- Say why the model helps: it shows where a behaviour could go wrong.
“Which sense picked it up, and what did the animal do about it?”
Investigate — measure and model
19 min- Pairs measure reaction times to a visual and a sound signal.
- They compare the two and suggest why they differ.
- They model three animal behaviours with the three boxes.
- They find one behaviour that happens too fast to involve the brain.
Independent practice
14 min- Students complete the 'Sense It, Work It Out, Do Something' page.
- Check the middle stage is present.
Close
3 min- Ask which sense the class would least want to lose, and why.
What goes wrong, and why
Each of these is a reasoning error rather than carelessness. The fix addresses the reasoning.
Skips the processing stage.
Why: Sense and response are visible.
Fix: Ask how the animal knew it was a fox and not a rabbit.
Thinks reactions are instant.
Why: They feel instant.
Fix: Measure them. There is a measurable delay.
Thinks every response involves a decision.
Why: Responses look chosen.
Fix: A reflex bypasses the brain. Both kinds exist.
If they are not there yet
- Two behaviours with the sense given.
- Three boxes pre-drawn.
If they finish early
- Compare reaction times for sight and sound and explain the difference.
- Model a behaviour with two senses involved.
- Say how a plant responds without a nervous system.
Exit ticket
A rabbit hears a fox and runs. Name the three stages between the sound and the running.
What to look for: Ears detect it, the brain processes it as danger, and the rabbit runs. Two stages means the processing box needs another run.
Printable practice for 4-LS1-2
Free to print and copy, answer key included. Each sheet can generate a fresh set of problems for a retake.
- Sense It, Work It Out, Do SomethingNumber the steps from 1 to 4.
Questions about Sense It, Work It Out, Do Something
How long does the Sense It, Work It Out, Do Something lesson take?
55 minutes, split across 5 timed sections: warm-up 5 min, teach 14 min, investigate 19 min, independent practice 14 min, close 3 min. The minutes are stated per section and add up to the stated length, so the plan can be cut or extended at a section boundary rather than abandoned halfway.
Which standard does Sense It, Work It Out, Do Something teach?
4-LS1-2 — 4-LS1-2, Life Science for Grade 4: “Use a model to describe that animals receive different types of information through their senses, process the information in their brain, and respond to the information in different ways.” In plain terms, model how an animal senses something, works it out, and responds.
What do I need to teach this lesson?
A reaction-time ruler drop, video of animal behaviour, three-box model cards: sense, process, respond and the printable practice sheet linked at the end of this plan. Everything listed is either ordinary classroom equipment or a free printable from this site — there is nothing to buy and nothing to prepare beyond photocopying.
What mistakes should I expect in this lesson?
Three, each a reasoning error rather than carelessness: skips the processing stage; thinks reactions are instant and thinks every response involves a decision. The plan gives the thinking behind each one and the teaching move that addresses the thinking rather than the symptom.
How do I know whether the lesson worked?
The exit ticket asks: “A rabbit hears a fox and runs. Name the three stages between the sound and the running.” Ears detect it, the brain processes it as danger, and the rabbit runs. Two stages means the processing box needs another run. That tells you whether the class needs a reteach or a thirty-second conversation before you plan tomorrow.
Is there a worksheet to go with Sense It, Work It Out, Do Something?
Yes — 1 printable 4-LS1-2 worksheet, linked at the end of the plan and free like the rest of the site. Each one comes with an answer key and 25 versions, so the practice after the lesson can be a different paper on every desk.
Is Sense It, Work It Out, Do Something free to use?
Yes. The plan, its printables and their answer keys are free to read, print and photocopy for your own class, with no account and no email capture. It was last reviewed on 8 September 2026. Please do not resell it or republish it as your own.
Last reviewed 2026-09-08. Aligned to 4-LS1-2 of the Next Generation Science Standards.