The correct answer is: D. phytoplankton->Rooted aquatic plants->Free floating stage->Reed swamp stage->Sedge Meadow stage-> wood land stage-> Climax forest
A hydrosere is a type of ecological succession that occurs in a wetland. The first stage in a hydrosere is the phytoplankton stage, in which small, floating plants called phytoplankton colonize the water. The next stage is the rooted aquatic plants stage, in which larger, rooted plants such as water lilies and cattails begin to grow. The third stage is the free floating stage, in which plants such as duckweed and water hyacinth float on the surface of the water. The fourth stage is the reed swamp stage, in which tall, reedy plants such as Phragmites australis grow in the water. The fifth stage is the sedge meadow stage, in which grasses and sedges grow in the water and on the banks of the wetland. The sixth and final stage is the woodland stage, in which trees such as willows and alders grow in the wetland.
The order of succession in a hydrosere is determined by the availability of light, nutrients, and water. In the early stages of succession, there is a lot of light and nutrients available in the water, so phytoplankton and other small plants can grow well. As the wetland matures, the water becomes more turbid and the nutrients become less available, so only larger, rooted plants can survive. In the final stage of succession, the wetland becomes a forest, with a dense canopy of trees that blocks out most of the light. This prevents most plants from growing in the forest, but a few shade-tolerant plants such as mosses and ferns can survive.
The process of succession is a gradual one, and it can take many years for a wetland to progress from one stage to the next. The rate of succession is affected by a number of factors, including the climate, the type of wetland, and the presence of human activity.