Why a checklist before every lab
Match preparation to the actual activity. The new data tasks and normal-care plant observation do not require dissection, microbial cultures, or chemical treatment. Sharps, stains, and other practical work require an instructor-approved procedure and competent supervision; a checklist alone is not authorization.
For the 14-day observation plan, use approved non-toxic plants, normal supplier-directed care, and separate plant IDs. Do not inoculate, culture unknown microbes, apply hormones or pesticides, or eat study specimens. An adult handles questionable mold or diseased material; supplied data is the analysis alternative.
It also does something quieter: it forces the student to arrive ready. The most dangerous lab partner is the one who skimmed the procedure in the hallway. This checklist closes that gap. Print one for every experiment, work top to bottom, and do not pick up a single scalpel until the last box is checked.
The goal is not to follow rules. It is to walk to the bench already knowing the hazards, the steps, and the result you expect.
1 — Safety
Nothing below this section happens until everything in it is done. No exceptions, every lab, every time.
- Safety goggles on — over the eyes, not pushed up on the forehead.
- Nitrile gloves on, correct size, no holes; sleeves down and long hair tied back.
- Closed-toe shoes and a lab coat or apron; never taste or ingest plant material, and note any known plant or pollen allergies before starting.
- Plant identity, media handling, and normal care approved in advance. Keep soil/media dust controlled, wash hands, and do not substitute unknown garden material or an unreviewed treatment.
- Any stains, fixatives, or preservatives in use checked for hazards — irritant warnings, first aid, and disposal noted.
- Scalpels and razor blades inspected and handled blade-away — every cut made on a dissection tray, never toward a hand or another student.
- Eyewash or a clear route to running water, a first-aid kit for cuts, and a sharps container located — you know where each one is before you start.
- Waste containers identified — you know exactly where used blades, spent specimens, and stained materials go.
2 — Setup
With safety confirmed, build the bench so the work flows without scrambling mid-dissection.
- The full procedure read end to end — not skimmed — so you know what step comes next.
- All tools gathered — dissection kit, microscope slides, cover slips, hand lens — clean and laid out in order of use.
- Microscope, hand lens, or dissecting scope selected to match the magnification the step requires; slides and cover slips ready.
- Ruler, calipers, or potometer located; you know which measurements you need to record — seedling height, leaf area, transpiration rate — and in what units.
- Specimens and prepared slides located, labels double-checked against the procedure, and freshness confirmed.
- Stains and mounting fluid (iodine, toluidine blue, water) set out with droppers; grow lights or a lamp positioned if the specimen needs backlighting.
- Lab notebook open to a fresh, dated page with the title and question already written.
3 — Readiness: the pre-lab questions
This is the section that separates a technician from a botanist. Before the first cut or the first slide, the student should be able to answer these in writing — in the lab notebook, in their own words.
- What is the question? State, in one sentence, what this experiment is trying to find out or measure.
- What is the botany? Name the structure or process the experiment depends on — the tissue you expect to see, the pathway water takes, the part of the flower you're dissecting.
- What is my prediction? A specific expectation — the tissue layers you expect under the microscope, the approximate stomatal count, the direction and rough rate of the transpiration stream.
- What am I measuring, and in what units? Name every quantity you will record, its unit, and its uncertainty.
- What could go wrong? Identify the one or two steps most likely to introduce error, and how you will minimize them.
- What does success look like? Know, before you begin, what a reasonable result would be — so an absurd number raises a flag at the bench, not a week later.
A student who answers all six is not guessing their way through a recipe — they are running an experiment they understand, with a result they can already roughly predict. That is exactly the readiness the lab-notebook entry is built to capture, and the kind of preparation a lab defense is designed to reward.