Seed Dispersal Methods

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Presentation transcript:

Seed Dispersal Methods It is important to get seeds far away from the mother plant. 1. Animal - stick to fur OR the animal eats the fruit or plant & then deposits the seeds later

2. Wind - light seeds float in air & are moved to new locations by wind 3. Water - seeds float & then new plant grows where the seed is left after water goes down

4. Explosive - when seeds are ready to be released, the seed pod ‘explodes’ sending the seed far from the mother plant 5. Gravity - the seeds simply fall to the ground when mature

Fruit A fruit is the fertilized egg of a plant (seed) & the swollen ovary (flesh of the fruit) There are many types: Pome: core with seed surrounded by papery ovary walls (apples, pears) Drupe: stony inner layer around the seed (cherry, peach)

Berry: thin skinned, fleshy at maturity (tomatoes, grapes, bananas) Pepo: berry with a thick, hard rind (watermelon, cucumbers)

Hesperidium: berry with leathery rind (oranges, grapefruit) Aggregate: formed from several pistils of a single flower (strawberry)

Multiple: formed from several flowers (pineapples)

Tropisms A tropism is a response in which a plant grows either toward or away from an environmental stimuli Phototropism: plants grow towards a source of light

Thigmotropism: plants move in response to touch Gravitropism: a root will grow towards the earth even when grown upside down

Chemotropism: plants growing towards a chemical (fertilizer) or away from it (herbicide)

Bonsai!!! We’re done!