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Grade 3 · unit review

Review: Germ routes and prevention

Trace supplied germ-contact routes and insert practical prevention steps.

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Bring the unit skills together

Use these 4 new cases to check your reasoning. Choices are temporary and are not saved to an account, sent to staff or recorded as school grades. Download your current review choices before leaving or reloading.

Unit review questions
1. Trace a hand-to-face route: A character handles garbage then eats with no wash. Which repair fits?
Need a hint?
  • An arrow shows a possible path, not proof of infection.
  • A wash earlier in the day does not replace washing after a new key contact.
2. Cover coughs without using hands: A paper scenario has no tissue but an elbow cover option. Which fits?
Need a hint?
  • Without a tissue, cover using the inside of the elbow rather than bare hands.
  • Cover choice does not replace appropriate disposal and hand hygiene.
3. Check a twenty-second scrub model: Fictional case 5: secondsPerSegment=7, segments=3. What is the modeled result using the stated method?
Need a hint?
  • Multiply equal scrub segments; other routine steps are not scrub time.
  • At least 20 seconds refers to scrub; the full routine still needs wet, lather, rinse and dry.
4. Distinguish prevention from certainty: A slogan promises a germ-free life from one routine. What fits?
Need a hint?
  • Reducing risk is different from guaranteeing an outcome.
  • One anecdote does not establish an infection’s cause.

The download contains your current choices and any checked feedback. Keep the separate transfer-task work in your own document; downloading its instructions does not mark it complete.

Use the skills in a new task

Repair a fictional cough-hand-toy-food chain, compute 4 segments of 5 seconds and rewrite a zero-illness promise.

Work on paper or in your own document. Explain the choices you made.

  • Use only the pretend details. Do not share private information about yourself or someone else.
  • Use at least two ideas you practiced in this unit.
  • Show the order or calculation, or point to the clue that helped you choose.
  • Keep the task’s safety rule, help step, or another way to take part.
Compare with a model response

Add appropriate covering and handwashing after hand contact and before food. 4*5=20 seconds of modeled scrub; wet, lather, rinse and dry remain separate. Replace the promise with “helps reduce spread.” The model does not diagnose or guarantee an outcome.

A different response can also meet the criteria. Compare the evidence and reasoning, rather than copying the wording.