| Chapter 38 Microbiology | | |
| Chapter 38 Microbiology (2021 new questions) | | |
| Chapter 39 Uses of microorganisms | | |
| Chapter 39 Uses of microorganisms (2021 new questions) | | |
| Chapter 40 Harmful effects of microorganisms | | |
| Chapter 40 Harmful effects of microorganisms (2021 new questions) | | |