Correct option is C
The correct answer is (c).
This exactly represents the sequential stages of hydrosere (hydrarch succession), completely describing the gradual ecological transformation of a barren aquatic ecosystem into a stable terrestrial climax community.
It strictly progresses from microscopic pioneer colonizers in deep water to fully developed terrestrial woodland.
Information Booster
- Phytoplankton Stage: Diatoms act as the primary pioneer species, successfully colonizing deep, barren water and initially building organic mud.
- Submerged Stage: As the basin slightly shallows, rooted submerged plants like Hydrilla anchor in the soft mud, aggressively trapping massive amounts of sediment.
- Floating Stage: As depths further decrease, broad-leaved floating plants like Wolffia form dense mats, severely restricting sunlight to the submerged species below.
- Reed-Swamp Stage: Emergent amphibious plants, such as sedges and reeds (Cyperus), invade the extreme shallows, vastly accelerating soil formation.
- Marsh-Meadow & Woodland Stage: The habitat becomes progressively drier marshland, eventually supporting shrubs and water-tolerant terrestrial trees like Populus (poplars).
- Climax Forest: The ultimate culmination is a mature, fully stable terrestrial forest perfectly adapted to the local climatic regime.
- Succession is an entirely predictable, highly directional process fundamentally driven by the organisms drastically modifying their own physical environment over time.
- Option A: This completely reverses the early succession stages, incorrectly placing emergent reeds (Cyperus) before the strictly aquatic pioneer diatoms.
- Option B: This incorrectly places floating Wolffia before the submerged Hydrilla stage. Deep water must first be stabilized by submerged roots before vast floating mats can dominate.
- Option D: This sequence is ecologically impossible, incorrectly culminating with phytoplankton (Diatoms) rather than a stable terrestrial climax community.
- Understanding precisely how a lake naturally transforms into a forest is a foundational concept in classical plant ecology and wetland management.
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