This is a sample report

Illustrative feedback on a made-up Biology investigation — this is what Wenzify gives you for your own IA.

Get feedback on your IA
BiologyBiology Scientific InvestigationSL

The effect of temperature on the activity of catalase in potato tissue

A sound investigation with good biological control, but the sample size is small, uncertainties are thin, and the conclusion isn't yet tied to enzyme theory with evidence. (Science estimates are the least reliable, so treat this as a wide guide.)

~2700 words · Up to 3,000 words. Charts, tables, equations, citations and the bibliography don't count.

Estimated

11–15

out of 24

Decent
AI estimate — not an official IB grade.

Draft history

How this commentary developed, draft by draft — a record you can show your teacher.

Draft 1

20 Aug 2026

9/24
A 3/6B 2/6C 2/6D 2/6

~2350 words

3/3 checklist done

11/24+2
A 3→4/6B 2→3/6C 2/6D 2/6

~2700 words

0/3 checklist done

Focus on these first

The highest-impact changes, in order.

1

Replicate and show uncertainty

Repeat each temperature at least three times and add error bars from the spread so the trend is reliable.

Design & data analysis (Criteria A, B)

2

Tie the conclusion to enzyme theory

Explain the slowdown above the optimum as denaturation, and compare your optimum with a published value.

Conclusion (Criterion C)

3

Make the evaluation specific

Replace generic weaknesses with specific ones ranked by their impact on the rate.

Evaluation (Criterion D)

Comments on your text

Working wellProblemSuggestion

Click a highlighted passage to see its comment.

This investigation examines the effect of temperature on the activity of catalase in potato tissue. The same variety of potato was used throughout to control genetic variation1, and the mass of tissue and the pH were kept constant. The volume of oxygen collected in 60 seconds was used as a measure of enzyme activity2 at each temperature. Catalase worked best at around 40 °C and slowed down at higher temperatures3. The potato pieces may not have been exactly the same size, which could have affected the surface area available for the reaction.

Criterion breakdown

Criterion A

Research design

4 / 6

DecentMedium confidence

How to improve

  • Increase to at least three replicates per temperature
  • Justify the temperature range chosen

To reach 5/6

Add replicates at each temperature and justify the range, so the design supports a reliable trend.

Criterion B

Data analysis

3 / 6

DecentMedium confidence

How to improve

  • Use replicate spread to add error bars
  • State the uncertainty of the gas syringe and carry it into the rate

To reach 4/6

Collect replicates, add error bars from their spread, and propagate apparatus uncertainties into the rate.

Tables, graphs and figures

Image 1 · Line graph of rate vs temperature

Figure 1 — Rate of oxygen production against temperature

Processed data section

Needs improvement
  • Add error bars from replicate spread
  • Link the drop after the optimum to enzyme denaturation in the text

Criterion C

Conclusion

2 / 6

Needs workMedium confidence

How to improve

  • Explain the drop in terms of denaturation of the active site
  • Compare the optimum with a published value

To reach 3/6

Justify the optimum through enzyme theory (denaturation) and compare it with published data.

Criterion D

Evaluation

2 / 6

Needs workMedium confidence

How to improve

  • Make the weaknesses specific and rank them by impact
  • Propose a realistic fix for the dominant error

To reach 3/6

Describe specific weaknesses, explain their relative impact on the rate, and give targeted improvements.

What's already working

  • Good control of biological variables
  • A valid measure of enzyme activity
  • A clear optimum identified from the data
  • A reproducible method

Revision Checklist

0 / 3 done