Seed dispersal is the movement and the transport of seeds away from the parent plant. Seeds can be dispersed by wind, animals and also by water.
Sunflower (Helianthus annuus)Its made by many small flowers crowded together. The outer flowers (ray florets) are often yellow, brown and orange. The flowers inside the circular head (disc florets) mature into seeds.
Wind: When the flower goes to seed, they form structures similar to parachutes. The top part of the tiny parachute is called the pappus, has hair and its very light. The stem attaches to the pappus and the bottom of the seed or fruit of the sunflower. Wind catches the hairy part of the pappus and lifts the seed from the plant into the air. When the wind is strong enough it can carry the pappus for miles, but when it’s to weak, the pappus comes to rest and attaches in a new location.
Animals: some types of sunflowers do not have pappus so animals also may help on the transport. The big seed are the favourite of birds for example, they carry them away or cause them to fall. Some seeds can get caught into the animals fur.
Water: some seeds might get into rivers and streams for example. The water carries the seed downstream until it becomes settled or picked up again by another animal. This is the less efficient form of dispersion according to the sunflower
PD: sorry, I just realized (after I posted in the forum) I did the same flower as Macarena Moreno, but I didn't notice page 2 existed before I post this, and we posted on the forum nearly the same time.