Final answer:
Gravity dispersal of seeds occurs when seeds fall to the ground due to the force of gravity. An example of this is the dispersal of maple seeds, which have winged structures that allow them to be carried further from the parent tree.
Step-by-step explanation:
The dispersal of seeds by gravity is called gravity dispersal or gravitropism. This mechanism occurs when seeds fall to the ground due to the force of gravity. One example is the dispersal of maple seeds, known as samaras. Maple trees produce winged seeds that are shaped like helicopters. These seeds have a relatively large surface area and as they fall, the wings cause them to rotate, creating lift and slowing their descent. This allows the seeds to be carried further away from the parent tree and increases their chances of finding suitable conditions for growth.
Learn more about Seed dispersal by gravity