Question 1
Through which labelled structure in the diagram of a leaf does most water vapour leave the leaf?
Biology grade boundaries explained
Boundaries are set after each session against grade descriptors, so they change every session. They apply to your weighted total.
| Scale | 1 to 7 in each subject |
|---|---|
| Weighting | Paper 1 36%, Paper 2 44%, scientific investigation 20% |
| May results | On the candidate website from 12.00 GMT on 6 July |
| Your boundaries | Your coordinator may show you the lower and upper boundary of your grade |
After results day
- Grades appear on candidates.ibo.org.
- If your school allows, you see your total and your grade's boundaries.
- A re-mark costs a fee and needs your written consent: a grade can go down.
Try 2 questions
Question 2
The pedigree shows a family with red-green colour blindness, caused by a recessive allele on the X chromosome. What is the probability that the next son of II-1 and II-2 is colour blind?
Next step
Questions people ask
Are grade boundaries the same every year?
No. The IB sets them each session.
Can a re-mark lower my grade?
Yes, which is why your written consent is needed.