Question

Identify the correct sequence of seral stages in the Xerarch Succession.

• A. lichens $\rightarrow$ mosses $\rightarrow$ herbs $\rightarrow$ shrubs $\rightarrow$ trees
• B. mosses $\rightarrow$ lichens $\rightarrow$ herbs $\rightarrow$ shrubs $\rightarrow$ trees
• C. herbs $\rightarrow$ shrubs $\rightarrow$ mosses $\rightarrow$ lichens $\rightarrow$ trees
• D. lichens $\rightarrow$ herbs $\rightarrow$ mosses $\rightarrow$ shrubs $\rightarrow$ trees

Hint:

Xerarch succession starts on dry surfaces, while hydrarch succession starts in water.

Answer 1

The Correct Option is A

Step 1: Understanding xerarch succession.
Xerarch succession begins in dry, barren areas such as bare rocks where soil is absent.
Step 2: Pioneer community.
Lichens are the first colonizers as they can survive harsh, dry conditions and initiate soil formation.
Step 3: Progressive stages.
Mosses grow next on thin soil, followed by herbs, shrubs, and finally trees as soil depth and moisture increase.
Step 4: Climax community.
Trees form the climax community, representing a stable ecosystem.