Why do seeds often do well when planted in soil?
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Answer: Soil holds water and minerals near the seed and gives roots support
Only soil can supply the water and oxygen a sprouting seed needs — Soil is not the only source of water and oxygen. A moist, well-aerated growing medium can supply both, while hydroponic systems can provide minerals in solution.
Soil holds water and minerals near the seed and gives roots support ✓ — Soil holds moisture and dissolved minerals near roots and provides anchorage as a seedling grows. A seed’s reserves support its early growth, so it can germinate without soil when its species-specific conditions are met.
Every seed must receive a special chemical signal from soil to germinate — A special signal from soil is not a universal requirement for germination. Seeds can sprout on moist paper with suitable oxygen and temperature; some species also respond to light or other cues.