In the nature, which of the following is/are most likely to be found surviving on a surface without soil?
- Fern
- Lichen
- Moss
- Mushroom
Select the correct answer using the code given below
Detailed Explanation:
Answer: Option 3 — 2 and 3
Lichens and mosses are uniquely adapted to survive on bare surfaces without soil. Lichens, being symbiotic associations of fungi and algae/cyanobacteria, can colonize rocks and tree bark by absorbing nutrients directly from air and rain. Mosses, though non-vascular plants, possess specialized structures that enable them to absorb water and nutrients from their immediate environment without requiring soil.
Analysis of Organisms:
1. Fern – Cannot survive without soil: Ferns are vascular plants requiring soil to anchor their roots and absorb water through their well-developed root systems.
2. Lichen – ✅ Can survive without soil: Lichens are symbiotic organisms (fungus + algae/cyanobacteria) that obtain nutrients directly from air and precipitation, thriving on rocks, bark, and other bare surfaces.
3. Moss – ✅ Can survive without soil: Mosses are bryophytes (non-vascular plants) with rhizoids that can attach to bare surfaces and absorb water and minerals directly from the environment.
4. Mushroom – Cannot survive without soil: Mushrooms are fungal fruiting bodies that require organic substrates (decaying matter, soil rich in nutrients) for the mycelium to grow and produce fruiting structures.
📝 Short Notes: Organisms Surviving Without Soil
| Organism | Type | Survival on Bare Surface | Key Characteristics |
|---|---|---|---|
| Fern | Vascular plant (Pteridophyte) | No | Requires soil for root anchorage; has true roots, stems, and leaves |
| Lichen | Symbiotic association | Yes | Fungus + algae/cyanobacteria; absorbs nutrients from air; indicator of air quality |
| Moss | Non-vascular plant (Bryophyte) | Yes | Has rhizoids (not true roots); absorbs water directly; can grow on rocks, bark |
| Mushroom | Fungal fruiting body | No | Requires organic substrate for mycelium; decomposes organic matter |
- Lichens are pioneer species in ecological succession, colonizing bare rocks and weathering them into soil over time.
- Lichens as bioindicators: Highly sensitive to air pollutants like SO₂, NOₓ, and heavy metals; absence indicates poor air quality.
- Mosses reproduce via spores and require moisture for fertilization but can survive desiccation in dry conditions.
- Bryophytes (mosses, liverworts, hornworts) lack vascular tissues (xylem and phloem) but can thrive in moist, shaded environments on various substrates.
- Ferns are more advanced than mosses, having vascular tissues, but still require moist conditions and soil for optimal growth.
Question 12 of 22 Keystone and Flagship Species
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