Question
What do you mean by perigynous?

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| Vaccine | Disease(s) | The Nature of Vaccine |
| TAB | 1. _______________ | 2. ___________________ |
| Salk's vaccine | 3. _______________ | 4. ___________________ |
| BCG | 5. _______________ | Living weakened germs |
| Vaccines for measles | Measles | 6. ___________________ |
| Cowpox virus | 7. _______________ | 8. ___________________ |
| Toxoids | 9. _______________ | Extracts of toxins |
| | 10. ______________ | Secreted by bacteria |
| Column A | Column B |
| Ichthyology | Viruses |
| Ornithology | Fishes |
| Ecology | Birds |
| Virology | Cells |
| Herpetology | Diseases |
| Paleontology | Fossils |
| Cytology | Snakes |
| Pathology | Environment |

| Column A | Column B |
| Raticide | Filaria |
| Culex | Insecticide |
| Rat flea | Encephalitis |
| DDT | Plague |
| Housefly | Gastroenteritis |
| Cockroach | Cholera |
| Cholera | Protozoan |
| Giardia | Contamination |
| Faeces | Vibrio |