What type of ecological succession initiates on newly formed bare rock surfaces or freshly cooled volcanic lava flows where no biological soil previously existed?

Answer and explanation

Correct answer: C. Primary succession

  1. Step 1: Ecological succession involves the orderly and predictable change in community species composition over time.
  2. Step 2: Primary succession begins on completely sterile, newly exposed geological substrates, such as cooled igneous volcanic lava or bare glaciated rock, where no biological soil or organic matter previously existed.
  3. Step 3: Pioneer organisms like crustose lichens secrete carbonic and organic acids to gradually weather the rock and initiate pedogenesis (soil formation).
Answer
Primary succession.
Why not the others: Secondary succession begins in areas where a biological community previously existed but was disturbed or destroyed (e.g., abandoned farmland, burned forests), leaving residual soil intact; Allogenic climax describes a climax state driven by abiotic geophysical changes rather than biotic facilitation; Retrogressive succession describes community deterioration to a simpler, less diverse state due to persistent disturbance.

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