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Science 7–10 · Years 9–10

Zones of inhibition: comparing antiseptics on a bacterial lawn

Science understanding: Biological sciences (NSW Stage 5 focus area Disease, Years 9 and 10; no ACARA v9 Science understanding content description deals with infectious disease or antimicrobial substances, so the ACARA side is coded to Year 9 and Year 10 science inquiry only)

Teacher-led demonstrationPracticalMedium risk

Teacher-led demonstration

A teacher carries out this activity as a demonstration. Its materials, steps, variables, misconceptions and sources are not published on the open web, and neither is any result, control or note that states a number or an amount: tutors and administrators read them on the learning platform, with the safety card first. The idea, the hazards and the curriculum references are below.

Open the procedure on the learning platform (tutor or administrator sign-in)

School laboratory, not for home

In a school laboratory, with a teacher supervising, under the school's risk assessment. Not for home.

The idea

A substance that stops bacteria growing leaves a clear ring around a soaked disc on a lawn of bacteria, and the ring's diameter compares how effective each substance is.

Safety card

Medium riskTeacher-led demonstration

Setting: In a school laboratory, with a teacher supervising, under the school's risk assessment. Not for home.

Hazards

  • Handling a live bacterial culture
  • Antiseptics and essential oils are irritants

Controls

At least one of them states a number or an amount, which may be part of the method, so the controls are shown with the method to tutors and administrators on the learning platform.

Note

It states a number or an amount, which may be part of the method, so it is shown with the method to tutors and administrators on the learning platform.

What you should see

It states a number or an amount, which may be part of the method, so it is shown with the method to tutors and administrators on the learning platform.

Curriculum references

The NSW syllabus outcomes and Australian Curriculum v9 codes this activity supports. They are references, not a verified or complete curriculum alignment.

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