How do seeds spread?
Flexi Says:
The ovary may ripen into a fruit (Figure here), allowing a diversity of seed dispersal mechanisms. Mammals and birds eat fruits which are fleshy (for example, cucumbers), sweet (berries), or oily (acorns), and unwittingly disperse the seeds inside them. You have undoubtedly encountered fruits with hooked burs, which catch onto animals’ fur (or socks) for transport. Other fruits develop wings (maple or elm seeds) or parachutes (dandelions), which catch the wind. Certain fruits dry in such a way as to burst open, spreading seeds mechanically.
