There are two main advantages to plants of dispersing their seeds away from the parent plant.
Firstly, seeds are dispersed to avoid competition between the parent plant and seedlings for sun and nutrients. If seeds only fell directly from the parent plant to the ground, new seedlings would sprout in the shade of the parent plant, receiving less sunlight. Also, the seedlings would send their roots down into the already established root zone of the...
There are two main advantages to plants of dispersing their seeds away from the parent plant.
Firstly, seeds are dispersed to avoid competition between the parent plant and seedlings for sun and nutrients. If seeds only fell directly from the parent plant to the ground, new seedlings would sprout in the shade of the parent plant, receiving less sunlight. Also, the seedlings would send their roots down into the already established root zone of the parent plant. The two would then be competing to absorb water and nutrients from the same limited space.
Secondly, seed dispersal increases the odds of species survival in the event of adverse local environmental conditions. For example, if all the members of one species are located in the same small area, the entire species can be eliminated by pathogens and predators. Dispersal increases the geographic range of the species such that pathogens, like fungus, and predators, like insects, don't affect all the members.
The main methods plants use to disperse their seeds to places with better growing conditions than directly under the parent plant include gravity, animals, force, wind and water. ....
On some plants native to Australia and South Africa, the seedpods may need the heat of the natural bush fires occurring in these areas to open and release their seeds, which are then dispersed by other means. (theseedsite.co.uk)
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