Biology (first assessment 2025)
IB Biology (first assessment 2025) — Chemical Signaling (hl Only) topical past papers
7 past-paper questions on Chemical Signaling (hl Only) for Biology (first assessment 2025).
- Questions
- 7
- Years
- 2025–2025
- With mark scheme
- 100%
- Questions 2021–2025
- 7
Anyone can browse these pages. Opening the questions and their mark schemes takes a free Momentum account.
How Chemical Signaling (hl Only) has been examined
From 2021 to 2025, Chemical Signaling (hl Only) was on 2 HL in 1 of 1 exam series, worth about 6% of that paper’s marks.
| Paper | Questions | Share of marks | Series |
|---|---|---|---|
| 1A HL | 4 | 3% | 1 of 1 |
| 2 HL | 2 | 6% | 1 of 1 |
| 2 SL | 1 | 6% | 1 of 1 |
Momentum’s own count, over the questions in its bank for these years: a series is one exam session, every zone included, and a question filed under two chapters counts in both. Median marks per question: 1.
Filed in Momentum under: Chemical Signaling (hl Only).
Practising in Momentum
- Every question in a chapter as one list, from every paper and year in the bank, newest first or shuffled.
- Each question turns over to its own part of the mark scheme, where the board published one.
- Narrow by paper, year, session, zone and marks, and star the questions worth keeping.
- Pick chapters, a number of questions and a time, and the exam builder draws a mock to sit and mark.
Past-paper questions and mark schemes are the copyright of International Baccalaureate. Momentum shows them to signed-in learners for revision and does not publish them on these pages.