Question

Arrange the following ecological succession in the lithosphere (rocks) from final to initial succession stage
A. Moss stage
B. Foliose - lichens stage
C. Herbaceous stage
D. Crustose - lichens Stage
E. Shrub stage
Choose the correct answer from the options given below:

• A. E, C, D, A, B
• B. E, C, B, A, D
• C. E, C, A, B, D
• D. E, C, A, D, B

Hint:

Always check the direction requested:
- Forward (Initial to Final): Crustose (D) $\rightarrow$ Foliose (B) $\rightarrow$ Moss (A) $\rightarrow$ Herb (C) $\rightarrow$ Shrub (E).
- Backward (Final to Initial): Shrub (E) $\rightarrow$ Herb (C) $\rightarrow$ Moss (A) $\rightarrow$ Foliose (B) $\rightarrow$ Crustose (D).
Reversing the order is a common trap in succession questions.

Answer 1

The Correct Option is C

Concept:
Primary ecological succession on a bare, subaerial rock substrate is designated as a lithosere (a type of xerosere).
Through progressive pedogenesis and microclimatic modifications, pioneer organisms gradually alter the hostile rock environment, allowing more complex plant forms to colonize the substrate over time.

Step 1: Normal Chronological Stages of a Lithosere (Pioneer to Climax):
1. Crustose Lichen Stage (D): Pioneer colonizers (such as Rhizocarpon and Lecanora) adhere tightly to bare rock surfaces, secreting carbonic and lichenic acids that etch rock minerals to form the first traces of mineral dust.
2. Foliose Lichen Stage (B): Leaf-like lichens with protruding thalli (such as Parmelia and Dermatocarpon) establish themselves over the crustose crust, accumulating wind-blown dust and organic detritus.
3. Moss Stage (A): Xerophytic mosses (such as Grimmia and Polytrichum) overgrow the decaying lichens, forming thick rhizoid mats that retain moisture and accelerate substrate weathering.
4. Herbaceous Stage (C): Deeper organic matter supports the germination of annual and perennial herbs, whose penetrating root systems break open rock crevices.
5. Shrub Stage (E): Shrubs (such as Rhus and Rubus) shade out herbaceous species, providing conditions for tree saplings to develop toward the climax woodland community.

Step 2: Reverse Ordering (Final to Initial):
The question explicitly demands ordering from the final to the initial succession stage:
- Final stage among the options: Shrub stage (E)
- Preceding stage: Herbaceous stage (C)
- Preceding stage: Moss stage (A)
- Preceding stage: Foliose lichens stage (B)
- Pioneer/Initial stage: Crustose lichens stage (D)
The resulting sequence is E $\rightarrow$ C $\rightarrow$ A $\rightarrow$ B $\rightarrow$ D.
Final Answer:
The reverse sequence corresponds to option (C).