If an area is burned with a fire hot enough to kill all of the existing plants in an area, we will typically find new plant life established in the area within a year. The first plants are commonly grasses and annual dicots. How can the rapid establishment of these plants be explained?

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    The seeds of these plants were present in the soil all along and were released from their dormancy by the heat of the fire.
    The fruits of these plants were transported into this area from outlying, unburned regions.
    The seeds of these plants were near the surface of the soil at the time of the fire and were protected by their seed coat and dormancy. Their dormancy was broken by their new exposure to the light when the covering plants were burned away.
    All three explanations probably contributed to the presence of these plants after the fire.

asked May 30, 2013 in Biology by anonymous
    

1 Answer

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All three explanations probably contributed to the presence of these plants after the fire.
answered May 31, 2013 by Bioshare ~Top Expert~ (34,070 points)

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