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juarezsanchez juarezsanchez
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11 years ago
List  three  plant  seeds  that  depend  on  fire to  germinate.What  is  adaptive about  this mechanism? What contribution do these plants make to the post-fire environment?
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11 years ago
fire is a strong stress barrier to the plants as they can not move. So the ones that evolutionary adapt some mechanisms to overcome to this stress will germinate faster then the others and can dominate the surrounding. It helps fast recovery of the ecosystem. There are some species like,

In chaparral communities in Southern California, for example, some plants have leaves coated in flammable oils that encourage an intense fire. This heat causes their fire-activated seeds to germinate (an example of dormancy) and the young plants can then capitalize on the lack of competition in a burnt landscape. Other plants have smoke-activated seeds, or fire-activated buds. The cones of the Lodgepole pine (Pinus contorta) are, conversely, pyriscent: they are sealed with a resin that a fire melts away, releasing the seeds.[5] Many plant species, including the shade-intolerant giant sequoia (Sequoiadendron giganteum), require fire to make gaps in the vegetation canopy that will let in light, allowing their seedlings to compete with the more shade-tolerant seedlings of other species, and so establish themselves.[6] Because their stationary nature precludes any fire avoidance, plant species may only be fire-intolerant, fire-tolerant or fire-resistant
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figpupfigpup
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11 years ago
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