Question 1
The diagram shows a section through a leaf with four layers labelled W, X, Y and Z. Which labelled layer carries out the most photosynthesis?
The biology internal assessment
Your own research question: about 10 hours, at most 3,000 words, 20% of your grade.
| Weight | 20% at SL and HL |
|---|---|
| Time | 10 hours of the course |
| Report | At most 3,000 words |
| Task | Gather and analyse data to answer your own research question |
The inquiry process
- Exploring and designing: a focused question, the variables and a method.
- Collecting and processing: enough repeats over a useful range, with means and variation.
- Concluding and evaluating: what the data show and how far to trust them.
Try 2 questions
Question 2
| Sample | Beetles caught | Marked beetles in sample |
|---|---|---|
| First | 40 | 40 |
| Second | 50 | 8 |
In a pond, 40 water beetles were caught, marked and released. A week later 50 beetles were caught, of which 8 were marked. Using the Lincoln index, what is the estimated population size?
Next step
Questions people ask
How much is the IB Biology IA worth?
20% at SL and HL. Paper 1 is 36% and Paper 2 44%.
What is the word limit for the IB Biology IA?
3,000 words.
Can the biology IA use a database or simulation?
Yes, where it fits your question.