Question
Define ecological succession. Give three differences between seral stages and climax community during succession.
| S. No. | Seral stage | Climax community |
| (i) | It is the sequential replacement and establishment of species in the process of succession. | It is the community which gets established at the terminal stage of succession. |
| (ii) | The species composition changes from time to time. | The species are stable and species composition do not change. |
| (iii) | Simple food chains and food webs are found. | Complex food chains and food webs are found. |
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| S. No. | Column I | S. No. | Column II |
| A. | Cleavage | 1. | Outer layer of the blastocyst that attaches to the endometrium during implantation. |
| B. | Implantation | 2. | Mitotic divisions of the zygote in quick succession. |
| C. | Inner cell mass | 3. | Embedding of the blastocyst in the endometrium of uterus. |
| D. | Trophoblast | 4. | Release of secondary oocyte from the ovary. |
| E. | | 5. | Group of cells attached to one end of trophoblast that differentiate into embryo proper. |