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Biology
Hạt nảy mầm — Điều gì giúp mầm sống thức dậy?
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Compare two trays with six mung bean seeds each. Change only water, oxygen availability or temperature in tray B.
Illustrative time scale
Only difference: Water
Changing a condition starts a new run with fresh seeds.
Only difference: Water
Both trays start with fresh seeds. Watch for the first root, then compare the trays at the same time point.
From seed to seedling
- 1Taking up water
- 2Root emerges
- 3Shoot grows
- 4Early seedling
A swollen seed is not counted until its root emerges.
Press Play to watch both trays change over time.
Loading resourceModel notes
- This illustrates viable mung bean seeds that do not require dormancy-breaking treatment. Both trays share the same six illustrative seed profiles; the counts do not predict germination in a real seed lot.
- Days, seed delays and drawing sizes are simplified for comparison. At 14 °C the illustrative progression is slower than at 25 °C. The coefficients are not fitted to experimental data, and 25 °C is not claimed to be the species optimum.
- Very low oxygen is a hypothetical condition that inhibits root emergence during the observation period. Gas exchange, waterlogging, disease, death and recovery are not modelled. No visible root does not prove that a seed is dead; changing conditions starts a fresh run with new seeds.
- Bean seeds use stored reserves during early development. Light requirements for germination vary by species. Both trays receive the same light, sufficient for the early seedlings shown. Do not extend this example to a plant's long-term needs.