A scientist found microorganism X in caterpillars affected by a communicable disease.
The scientist divided healthy caterpillars into four equal-sized groups. Each caterpillar was given identical food with an equal-volume drop added to it.
| Addition to each drop | Caterpillars showing symptoms after 7 days (%) |
|---|---|
| Sterile water only | 0 |
| 100 live microorganisms X | 15 |
| 1000 live microorganisms X | 65 |
| 1000 killed microorganisms X | 0 |
Name the biological term for microorganism X.
Explain how the results support your answer to part (a).
252 exam-style questions on AQA GCSE Biology 3.1 Communicable diseases, covering 3.1.1 Communicable (infectious) diseases, 3.1.2 Viral diseases, 3.1.3 Bacterial diseases, 3.1.4 Fungal diseases, 3.1.5 Protist diseases, 3.1.6 Human defence systems, 3.1.7 Vaccination, 3.1.8 Antibiotics and painkillers, and 3.1.9 Discovery and development of drugs. Each one has a worked solution and a mark scheme showing where the marks go.