Answer:
Primary succession occurs on land that lacks soil. When pioneer species colonize such land, they break the rocks, and the process of soil formation begins. Soil formation is an arduous process and takes many years. On the other hand, secondary succession occurs on land where soil is already present. Moreover, roots and seeds of few pants are also present in the soil. This helps in reestablishment of plants and other species. Therefore, the rate of primary succession is slow as compared to secondary succession.
Ecological successions are the chances of the species and area over time. The rate of primary succession is slow compared to secondary succession due to lack of the substrate.
Primary and secondary are the ecological succession that differs as primary is the basic and first series of setup that includes the formation of the soil (substrate) and the whole process from the base. It is a longer process.
Secondary succession is fast and short as vegetation is already present and does not require any pioneer species to set the topsoil. The land is already present and hence the process is short.
Therefore, the primary takes a longer time compared to the secondary succession.
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