| Statement I: | A is primary succession and B is secondary succession. |
| Statement II: | A will be much faster in pace than B. |

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| 1 | 2 | 3 | 4 | |
| A. | Phyto- plankton |
Zoo- plankton |
Phyto- plankton |
Phyto- plankton |
| B. | Submerged plant | Submerged free floating plant |
Submerged plant | Reed swamp |
| C. | Submerged free floating plant | Reed swamp | Scrub | Submerged plant |
| D. | Reed swamp | Marsh meadow | Submerged free floating plant |
Marsh meadow |
| E. | Marsh meadow | Scrub | Reed swamp | Submerged free floating plant |
| F. | Scrub | Submerged plant |
Marsh meadow | Scrub |

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