The Question is from neet-botany , and it was created by the author Mr. NARESH KUMAR K

Question

In a primary succession on bare rock, which of the following represents the MOST likely order of dominant plant communities over time, assuming no major disturbances?

Mr. NARESH KUMAR K · Accepted Answer

## CORE INFORMATION
✓ **Answer**: A
## CONCEPT FRAMEWORK
 **Primary Concept**: Primary succession
 **Related Topics**: Ecological succession, pioneer species, climax community
 **Prerequisites**: Understanding of plant adaptations and environmental tolerance.
## SOLUTION PATHWAY
**Given Information**:
  Primary succession on bare rock.
  No major disturbances.
**Method & Steps**:
 1. Identify pioneer species.
  Reasoning: Primary succession begins with species that can colonize bare rock. Lichens are the most likely pioneer species because they can survive harsh conditions and slowly break down the rock to form soil.
  Formula/Rule: None
 2. Determine the order of succession.
  Working: As soil develops, more complex plants can colonize the area. Mosses, which require more moisture and nutrients than lichens, will follow. Next, grasses will establish themselves in the developing soil. As the soil improves, shrubs and finally trees can grow.
  Key Point: The order reflects increasing complexity and resource demands.
 3. Select the correct option.
  Result: Option A (Lichens → Mosses → Grasses → Shrubs → Trees) accurately represents the most likely order of succession.
  Verification: This order reflects the typical progression of plant communities in primary succession, starting with the most resilient species and culminating in a more complex, stable ecosystem.
 ## OPTION ANALYSIS
A ✓: This option correctly shows the progression from pioneer species (lichens) to a climax community (trees).  The intermediate stages (mosses, grasses, shrubs) are appropriately ordered based on their increasing resource requirements and soil development needs.
B :x: This option incorrectly places mosses before lichens. Mosses require more developed soil than lichens.
C :x: This option is completely reversed, placing the climax community (trees) before the pioneer species (lichens).
D :x: This option is also completely reversed, placing the climax community before the pioneer species.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing primary and secondary succession: Remember that primary succession starts on bare rock, while secondary succession occurs after a disturbance in an existing ecosystem.
  2.Ignoring environmental factors:  The order of succession can be influenced by factors like climate, soil type, and available resources. However, the general pattern remains consistent.
 **Quick Tips**:
  1.Remember the acronym:  L-M-G-S-T (Lichens, Mosses, Grasses, Shrubs, Trees) as a mnemonic device.
  2.Consider the needs of each plant type:  Pioneer species are highly adaptable to harsh conditions, while later species require more developed soil and resources.

Mr. NARESH KUMAR K · Answer

The correct Option is "Lichens → Mosses → Grasses → Shrubs → Trees"

Mr. NARESH KUMAR K · Answer

Mosses → Lichens → Grasses → Trees → Shrubs

Mr. NARESH KUMAR K · Answer

Grasses → Shrubs → Trees → Mosses → Lichens

Mr. NARESH KUMAR K · Answer

Trees → Shrubs → Grasses → Mosses → Lichens

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