Physical dormancy is a survival strategy used by some seeds, where they remain inactive and do not germinate even when conditions are favorable. This dormancy is often caused by a hard seed coat that prevents water and gases from entering, which are essential for germination. To break this dormancy, seeds may require specific environmental cues, such as fire, moisture, or temperature changes. These cues help to weaken or break down the seed coat, allowing the seed to absorb water and begin the germination process when conditions are right for growth.