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A1.4 · Plan investigations using safe laboratory practices

Learn to plan investigations using safe laboratory practices through clear examples and targeted practice.

Ontario Grade 11 Biology

Scientific Investigation Skills and Career Exploration

A practical approach to expectation A1.4: Plan investigations using safe laboratory practices

In Grade 10 science, you practised asking questions, planning fair tests, and following laboratory instructions. Those habits matter in biology, too. A safe investigation is not just a procedure with a warning added at the end. Safety affects what materials you choose, what steps you plan, and whether an activity should go ahead at all. This lesson focuses on planning: identify possible hazards, decide how to reduce risk, and check your plan with the teacher before beginning. Do not collect specimens, handle materials, or perform a procedure unless it has been approved and supervised.

What you will learn

Identify possible hazards before an investigation begins.
Choose safety steps that match the materials, equipment, and procedure.
Include safe preparation, work, cleanup, and reporting in an investigation plan.
Recognize when to stop and ask the teacher for direction.

1. Start with the question and the setting

An investigation is a planned way to gather observations or measurements that help answer a question. For example, a class might ask, “Does the amount of light affect how quickly a plant’s leaves lose water?” Before choosing a procedure, identify what the class would need to do and what could go wrong.

A hazard is something that could cause harm. Risk is the chance that harm could occur in a particular situation. A hazard might be a glass container that can break. The risk depends partly on how it is handled and where it is placed. Planning reduces risk, but it cannot make every activity risk-free.

Begin by listing the materials, equipment, and actions involved. Think about the room as well as the investigation. Could liquid spill near electrical equipment? Would glass be used? Could a person be exposed to a material, sharp edge, heat source, or living organism? Do not assume a material is safe because it is familiar or used in small amounts. Check its label and the teacher’s instructions.

The SNC2D inquiry process provides a useful bridge: identify a question, plan how to investigate it, and consider how to make observations consistently. In biology, safety belongs in that planning stage. If a safe method is not clear, ask the teacher before proceeding.

A hazard could cause harm; risk is the chance of harm in a situation.
Review every material, tool, action, and part of the work area.
Ask the teacher when a hazard or safe procedure is unclear.

2. Build safety into each stage

A useful plan considers safety before, during, and after the investigation. Before work begins, read the procedure and labels, follow the teacher’s directions, and identify required protective equipment. Protective equipment is clothing or gear used to reduce exposure or injury, such as safety goggles when the teacher requires them. Tie back long hair and secure loose clothing when directed.

During the investigation, follow the approved procedure. Keep the work area orderly, use equipment only as instructed, and do not eat or drink in the laboratory. Never taste a laboratory material. Avoid touching your face, and wash your hands as directed. Keep containers labelled so their contents are not confused. Do not mix materials unless the approved procedure says to do so.

Afterward, follow the teacher’s directions for returning equipment, disposing of materials, and cleaning the work area. Do not pour or discard anything unless instructed. Report spills, breakage, injuries, or unexpected reactions promptly. Stop work and move away from an immediate danger; tell the teacher rather than trying to fix an unfamiliar problem yourself.

A safety plan should name an action, not just say “be careful.” For example, “Keep the container away from the edge of the bench” is clearer than “Handle carefully.” The right precaution depends on the actual hazard and the classroom procedure.

Plan safe preparation, work, cleanup, and reporting.
Use only teacher-approved materials and procedures.
Stop and notify the teacher if something unexpected happens.

3. Turn a biological question into a safe plan

Consider a classroom investigation that compares plant growth under two light conditions. The question is biological, but the planning still needs to account for ordinary laboratory hazards. Containers could spill or break. Water near electrical equipment could create a danger. Plants or other materials should be handled only as the teacher directs.

A plan can separate the scientific purpose from the safety decisions. The scientific purpose states what will be compared and observed. The safety decisions state how the class will set up the work, manage materials, and respond to problems. This keeps safety connected to the actual procedure instead of relying on a generic warning.

Use a simple hazard-to-action model: identify a possible hazard, describe how harm could occur, and choose a practical precaution or teacher direction. This is a planning tool, not a guarantee that harm cannot occur. The teacher must review the plan and decide whether it is suitable for the class.

Safety can also affect the method you choose. If a proposed activity would require handling an unknown material or carrying out an unapproved procedure, do not proceed with it. Ask the teacher for an approved alternative. A question can often be investigated in more than one way, but not every method is suitable for a school laboratory.

Match each precaution to a hazard in the proposed procedure.
Include the teacher’s approval as part of the plan.
Change or pause a plan when safe handling is not clear.

4. Review the plan before starting

Before beginning, check that the question and procedure are clear, the materials are identified, and the safety actions are specific. Confirm that required protective equipment and cleanup directions are known. Make sure each student knows how to report a problem. If any answer is missing, pause and ask the teacher.

A plan is not evidence that an investigation is safe in every setting. Classroom conditions can change, and an unexpected spill or broken item can create a new hazard. Follow the teacher’s current instructions, even if they differ from a plan written earlier. Report changes rather than silently continuing.

Keep observation separate from explanation. If a container tips over, that is an observed event. Saying that it tipped because it was too close to the edge is an explanation that should be checked against what happened. Clear reporting helps the teacher decide what response is needed.

The main habit is straightforward: think ahead, use approved procedures, and communicate. Good safety planning supports careful biological inquiry because students can focus on observations without ignoring the conditions needed to work responsibly.

Do a final check and resolve unclear steps before work begins.
Follow current teacher directions if conditions change.
Report what you observed without guessing at the cause.

A simple safety-planning check

Planning stage	Question to ask	Example action
Before	What materials and hazards are involved?	Read directions and ask about anything unclear.
During	How will the approved procedure be followed?	Keep the work area orderly and report problems.
After	How will equipment and materials be managed?	Follow teacher directions for cleanup and disposal.

Worked example

Planning a plant-light comparison

A class proposes comparing plants placed in two different light conditions. Outline safety points that should be included before the investigation begins.

Identify the setup
List the containers, water, plants, and any lighting equipment in the teacher-approved procedure. This shows which objects and actions need a safety check.
Connect hazards to precautions
A container might spill or break, and water should be kept away from electrical equipment. Plan a stable setup and follow the teacher’s directions for placing containers and using lights.
Check supervision and cleanup
Confirm the required protective equipment, handling instructions, and cleanup steps with the teacher. Do not begin until unclear directions are resolved.

Answer: A suitable plan identifies the materials and equipment, keeps containers stable and water away from electrical equipment, follows teacher directions for plant and light handling, and states how to clean up and report a spill or breakage.

Check: The plan addresses the proposed setup rather than relying only on a general instruction to be careful.

Worked example

Responding to an unclear material

A written procedure mentions a liquid in an unlabelled container. What should a student do when planning the investigation?

Recognize the missing information
The liquid’s identity and handling directions are unknown. Without that information, the student cannot make a sound safety plan.
Pause the proposed work
Do not open, use, smell, or otherwise test the liquid. Those actions would expose the student to an unknown material.
Ask for an approved direction
Tell the teacher and wait for identification and instructions or an approved alternative. The plan should be updated before any work begins.

Answer: Do not use the liquid. Ask the teacher to identify it and provide safe instructions, or to approve a different procedure.

Check: The student does not guess what the material is or attempt to identify it through direct contact.

Worked example

Planning for a broken container

While reviewing a procedure that uses glass containers, a group realizes it has not planned what to do if one breaks. What should the group add?

Name the hazard
Broken glass can cut someone. The group should include this possibility in its plan before the investigation begins.
Choose a safe response
The plan should say to stop work, keep people away from the broken glass, and notify the teacher promptly. Students should not pick up the pieces unless the teacher specifically directs them and provides the approved method.
Confirm the direction
The teacher must explain the classroom’s cleanup procedure. Adding a clear reporting step is safer than leaving students to decide how to handle broken glass.

Answer: Add a direction to stop, keep others away, and tell the teacher immediately. Follow the teacher’s instructions for cleanup rather than handling broken glass independently.

Check: The response protects students from contact and leaves cleanup to the approved classroom procedure.

Common mistakes and how to avoid them

Writing “be careful” as the only safety instruction.

Correction: Name a hazard and a specific action that reduces the chance of harm.

Assuming a familiar-looking material is safe.

Correction: Check the label and teacher’s directions. Do not use an unidentified material.

Trying to clean up a spill or broken glass without asking.

Correction: Stop, keep others away from the hazard, and tell the teacher. Follow the approved response.

Treating the written plan as permission to continue after conditions change.

Correction: Pause and follow the teacher’s current instructions when an unexpected event occurs.

Lesson summary

Safe investigation planning begins before materials are handled.
Identify hazards in the materials, equipment, actions, and work area.
Choose specific precautions that fit the proposed procedure.
Plan safe work, cleanup, and reporting, and ask the teacher about anything unclear.
Stop and report unexpected events rather than improvising a response.

Check your understanding

Question 1

A procedure includes a material with no label. What is the safest planning choice?

Use a small amount to see what it does.
Ask the teacher to identify it and provide directions before proceeding.
Use it only if another student recognizes the container.
Pour it out and continue with the remaining materials.

Show answer and explanation

Ask the teacher to identify it and provide directions before proceeding.

An unidentified material cannot be assessed safely by guessing or testing it. Ask the teacher and wait for an approved direction.

Question 2

Which instruction is the most useful safety plan for a possible spill?

Be sensible.
Ignore a small spill.
Stop, keep others away, and notify the teacher.
Wipe it up with whatever is nearby.

Show answer and explanation

Stop, keep others away, and notify the teacher.

This gives clear actions and leaves the response to the teacher’s approved procedure.

Question 3

When should students review cleanup directions?

Only after an accident happens.
Before starting, as part of the investigation plan.
Only if the procedure uses glass.
Cleanup does not need to be planned.

Show answer and explanation

Before starting, as part of the investigation plan.

Planning cleanup in advance helps students know how to manage materials safely after the investigation.

Key terms

Investigation: A planned way to gather observations or measurements to help answer a question.
Hazard: Something that could cause harm.
Risk: The chance that harm could occur in a particular situation.
Protective equipment: Clothing or gear used to reduce exposure or injury, as directed for an activity.

Continue through SBI3U

View the complete SBI3U Ontario Grade 11 Biology curriculum and lessons

About this lesson and its review

Published by DoAssignment. This reviewed lesson follows Ontario Grade 11 Biology (SBI3U), expectation A1.4. It is a study resource, not an official curriculum publication.

Before publication, content is checked for structure, mathematical or chemical notation, calculations, course boundaries, and readability. Errors can still occur, so corrections are welcomed.

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