Presentation on theme: "What Adaptations Do Plants Have to Disperse Seeds?"— Presentation transcript:
What Adaptations Do Plants Have to Disperse Seeds?
Plants rely on their environment to disperse seeds. Wind Animal Transport External Internal Other: burying seeds Drop to ground
Wind Dispersal Some structures allow seeds to be easily carried in the wind. Achene Pappus
External Transport Examples of seed structures for external transport: Hooks Barbs Internal Transport Seeds are encased in fleshy fruits Inadvertent dispersal (burying seeds) Some plants depend upon animals to disperse their seeds. There are three variations of animal dispersal:
Projections extending from a seed case attach onto a passing animal, carrying the seed to a new location.
Barbs attach to animal fur. Barb
Fleshy fruits surround seeds to be consumed and expelled by animals.
The Oak tree depends upon the squirrel for its seed dispersal. Squirrels bury acorns in the Fall and often forget where they are in the winter. These seeds then sprout new trees.
Some plants simply drop the seeds on the ground. What are some disadvantages of this method? Individual seed
What adaptations do seeds have to assist in dispersal? Identify the adaptation and type of dispersal for each of the following pictures