A plant that is growing successfully in very shallow, compacted soil, is likely to have what type of root system?

Question

BlackTom AI · Accepted Answer

Fibrous roots because they spread out horizontally.

1) Relevant knowledge points and concepts
- Two primary plant root system types: fibrous (many fine, branching roots near the soil surface) and taproot (one dominant central root that grows deeply).
- Soil depth and compaction affect root penetration: compacted or very shallow soils limit vertical root growth and oxygen/water availability at depth.
- Adaptive strategy: plants in shallow/compacted soils rely on lateral, fine roots to exploit surface layers for water and nutrients and to anchor the plant.

2) Step-by-step reasoning
- Step 1: Identify soil conditions — very shallow and compacted soil restricts how deep roots can grow.
- Step 2: Compare root types — taproots require depth to grow a main vertical root; fibrous roots consist of many thin roots that spread horizontally and stay in the upper soil horizon.
- Step 3: Determine adaptive advantage — a horizontally spreading fibrous root system maximizes contact with the limited soil volume available near the surface, increasing absorption area and anchorage without needing depth.
- Step 4: Apply to plant survival — such plants can quickly exploit surface moisture after rains and avoid trying to penetrate compact layers.

3) Calculations/intermediate steps
- No numerical calculations are required; reasoning is comparative and morphological.

4) Why the correct answer is correct
- Fibrous roots are specifically adapted to shallow or compacted soils because they form dense mats of fine roots near the surface, providing efficient water and nutrient uptake within the limited soil depth and resisting displacement.

5) Why other options are incorrect
- "Square roots" is not a botanical root type; it’s incorrect terminology.
- "Hyphae" are fungal filaments, not plant roots; while fungi can help plants, hyphae are not the plant’s root system.
- "Tap roots" are designed for deep anchorage and access to deep water, which is not possible in shallow, compacted soils.

6) Conclusion
The correct choice is "Fibrous roots because they spread out horizontally," which matches the provided answer.

A plant that is growing successfully in very shallow, compacted soil, is likely to have what type of root system?Single choice

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