Question:
Pioneers of xerarch and hydrach succession respectively are:
Pioneers of xerarch and hydrach succession respectively are:
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Lichens are pioneers of terrestrial succession, phytoplankton of aquatic succession.
Updated On: Jun 20, 2026
- Phytoplanktons, Lichens
- Lichens, Phytoplankton
- Diatoms, Lichens
- Lichens, Sedges
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The Correct Option is B
Solution and Explanation
Step 1: Understanding ecological succession.
Xerarch succession starts in dry habitats (bare rocks), while hydrach succession starts in aquatic habitats. Pioneer species initiate these successions.
Step 2: Xerarch succession pioneers.
Lichens are pioneer organisms on bare rocks; they can survive harsh dry conditions and help soil formation.
Step 3: Hydrach succession pioneers.
Phytoplankton are the first colonizers in aquatic ecosystems and initiate hydrosere succession.
Step 4: Analysis of options.
Only the combination of lichens (xerarch) and phytoplankton (hydrach) correctly matches ecological roles.
Step 5: Ecological reasoning.
These pioneer organisms modify environments, enabling subsequent stages of succession.
Step 6: Final conclusion.
Thus, correct answer is lichens and phytoplankton.
\[ \boxed{(2)} \]
Xerarch succession starts in dry habitats (bare rocks), while hydrach succession starts in aquatic habitats. Pioneer species initiate these successions.
Step 2: Xerarch succession pioneers.
Lichens are pioneer organisms on bare rocks; they can survive harsh dry conditions and help soil formation.
Step 3: Hydrach succession pioneers.
Phytoplankton are the first colonizers in aquatic ecosystems and initiate hydrosere succession.
Step 4: Analysis of options.
Only the combination of lichens (xerarch) and phytoplankton (hydrach) correctly matches ecological roles.
Step 5: Ecological reasoning.
These pioneer organisms modify environments, enabling subsequent stages of succession.
Step 6: Final conclusion.
Thus, correct answer is lichens and phytoplankton.
\[ \boxed{(2)} \]
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