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NTA Abhyas NEET2020BotanyEcosystemPractice

Which of the following sequences is correct in a hydrarch succession?

Options

  1. AZooplankton, free-floating plants, reed swamp, scrub, forest
  2. BPhytoplankton, rooted submerged plants, free-floating plants, marsh meadow, scrub, forest
  3. CPhytoplankton, free-floating plants, marsh meadow, reed swamp, scrub, forest
  4. DPhytoplankton, free-floating plants, rooted submerged plants, reed swamp, scrub, forest

Correct answer

B. Phytoplankton, rooted submerged plants, free-floating plants, marsh meadow, scrub, forest

Step-by-step solution

Both hydrarch and xerarch successions lead to medium water conditions (mesic): neither too dry (xeric) nor too wet (hydric). In primary succession in water, the pioneers are the small phytoplanktons, they are replaced with time by rooted-submerged plants, rooted-floating angiosperms followed by free-floating plants, then reed swamp, marsh-meadow, scrub and finally the trees. The climax again would be a forest. With time the water body is converted into land.

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