| 1. | A population | 2. | A species |
| 3. | A biological community | 4. | An ecosystem |

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| Statement I: | Entire biosphere is regarded as a global ecosystem by many ecologists. |
| Statement II: | The global ecosystem is divided into terrestrial and aquatic ecosystem for convenience. |
| 1. | Only Statement I is correct. |
| 2. | Only Statement II is correct. |
| 3. | Both Statement I and Statement II are correct. |
| 4. | Both Statement I and Statement II are incorrect. |

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| 1. | Stratification | 2. | Scarification |
| 3. | Standing crop | 4. | Standing state |

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