Lesson at a Glance | He Tirohanga Whakamua
Ngā Whāinga Ako | Learning Intentions
Students will know
- How to write a numbered, step-by-step practical method that is fully repeatable.
- Why performing at least 3 repeat trials per IV level is mandatory for NCEA experimental reliability.
- How to document laboratory safety risks (hot water, glassware, electrical lamps near water) and risk mitigations.
Students will demonstrate
- By writing a complete 8-12 step practical investigation method.
- By completing Section 4 of their Level 1 Science Biological Investigation Logbook.
Curriculum alignment
- NZC (2007) · Science · Level 6 · Nature of Science: “Develop and carry out more complex investigations, including using models.”
Do Now | Tīmatanga Whakaaro (10 min)
Method Repeatability Prompt:
"If Step 3 in your method says 'Put some weed in water and wait a bit,' why will an NCEA assessor reject it?"
Unpack: Vague instructions mean another student cannot replicate your test. A valid method specifies exact quantities: "Cut a 7cm sprig of Elodea aquatic plant underwater, place it cut-stem-up in a 250mL beaker filled with 0.2% sodium bicarbonate solution, and allow 3 minutes to acclimatize."
4 Golden Rules for Level 1 Science Practical Methods (15 min)
1. Equipment & Quantities
List precise volumes (mL), lengths (mm/cm), concentrations (%), and apparatus (beaker size, lamp wattage).
2. Step-by-Step Sequence
Use numbered imperative steps (1. Measure, 2. Place, 3. Start stopwatch...). Include acclimatization times.
3. Repeat Trials (Reliability)
State explicitly: "Repeat the measurement 3 times for each of the 5 IV levels to calculate a reliable mean."
4. Safety & Risk Mitigation
Identify hazards (e.g. water near lamp = shock risk; cut glass = cut risk) and state exact safety precautions.
📁 Biological Investigation Logbook — Section 4: Practical Method & Safety Protocol
Students open their Level 1 Science Logbook and complete Section 4:
Section 4 Requirements:
1. Equipment List: Detailed list of all glassware, measuring tools, and biological materials.
2. Numbered Method Steps: Complete 8–12 step procedure describing setup, IV manipulation, DV recording, and CV maintenance.
3. Repeat Protocol: Explicit rule detailing 3+ trials per IV level for reliability.
4. Safety Table: 2 hazard mitigations (Hazard → Risk → Prevention).
Exit Verification | Ka Mutu Hoki (5 min)
Exit Check:
"My method contains numbered steps, specifies 3 repeat trials per IV level, and includes a safety hazard table in Section 4."
Teacher Planning & NCEA Alignment
NCEA Level 1 Science Alignment (4 Credits):
- Practical Method: Develop a step-by-step practical method that incorporates repeat trials and controls variables.
- Reliability: Demonstrate understanding of repeating measurements to calculate averages and minimise random error.
Vocabulary: Practical method, repeatability, reliability, repeat trials, acclimatization, hazard mitigation, equipment specification.
Other teaching approach: Guided Viewing & Practical Investigation →