| 1. | The two overlapping shells of cell wall fit together as in a soap box. |
| 2. | They are the chief ‘producers’ in the oceans. |
| 3. | Their cell walls are embedded with silica. |
| 4. | Diatoms behave like heterotrophs when deprived of sunlight. |
| 1. | These organisms are naturally resistant to antibiotics that inhibit protein biosynthesis |
| 2. | These organisms are naturally resistant to antibiotics that target the cell wall |
| 3. | These organisms are naturally resistant to antibiotics that inhibit DNA replication |
| 4. | These organisms are naturally resistant to antibiotics that inhibit folic acid metabolism |
| 1. | Meiosis in zygote — Plasmogamy — Karyogamy |
| 2. | Karyogamy — Meiosis in zygote — Plasmogamy |
| 3. | Plasmogamy — Karyogamy — Meiosis in zygote |
| 4. | Karyogamy — Plasmogamy — Meiosis in zygote |