Question

what would have happend if there were no external agents for seed dispersal

Answer 1

plants make seeds that can grow into new plants but if the seeds just fall to the ground under the parent plant, they might not get enough sun, water or nutrients from the soil.

if the seeds just fall to the ground under the parent plant and they won't get enough sun water and nutrients

Answer 2

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If seed dispersal did not take place then the seeds will germinate right next to the original plant. The seed and the plant will compete for sunlight and water. Resulting for the plants getting less than needed sun light and water. Thus this will result in dying of the plantDispersal of seeds is very important for the survival of plant species. If plants grow too closely together, they have to compete for light, water and nutrients from the soil. Seed dispersal allows plants to spread out from a wide area and avoid competing with one another for the same resources.