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Slide 1Slide 2Slide 3Slide 4Slide 5Slide 6Slide 7Slide 8Slide 9Slide 10Slide 11Slide 12Slide 13Slide 14Slide 15Slide 16Slide 17Slide 18Slide 19Slide 20Slide 21Slide 22Slide 23Slide 24Life CyclesOffspring resemble their parents -- or do they?Kids are familiar with...•The life cycle of mammals.•Most kids know that puppies are small dogs, kittens are young cats, etc.Matching adults and babiesABCD1234Other vertebrates aren’t hard...ABC123But some are a little harder...123ABCInvertebrates: some are easy...1234DCBAMost are not!4321ADCBEven harder...4321DCBAThe difference is...Metamorphosis!Gradual Metamorphosis•Little change from nymph (juvenile) to adult.Incomplete Metamorphosis•The juvenile form (nymph or naiad) has some resemblance to the adult. Both may, for example, have compound eyes.Complete Metamorphosis•Egg, larva, pupa, and adult stages all look very different from one another.PlantsPlant Life Cycle•Plants, too, have a life cycle from egg, to embryo, to juvenile and adult forms.•However, plants have a two-phase life cycle that is even more complex than animal cycles.•Both spores and gametes are their reproductive cells.What elementary students need to know:•Moss is the simplest of all true plants.•If we look at the moss life cycle, we can see the two phases to the plant life cycle: gametophyte and sporophyte.MossFerns•The same life cycle appears in ferns.•Here, the gametophyte and sporophyte phases are completely separate, free-living individuals.Flowering Plants•Conifers and flowering plants have the same life cycle. However, the male gametophyte is hidden in the pollen, while the female is in the ovule.Flowers•Flowers are the reproductive structures of flowering plants.•Some have male parts only, some have female parts only, and some have both, depending on the type of plant.Fruits•In flowering plants, a fruit is a developed ovary and contains seeds.•All of these structures on the right are fruits. They all grew from the ovary of the flower, and contain seeds.Fruits•These, too, are fruits. All grew from the ovary of a flower, and contain one or more seeds.Fruit dispersal•The form of the fruit gives clues about its dispersal.•Small, dry fruits with “wings” or “parachutes” may be wind-dispersed. Fleshy fruits are often animal dispersed. Explosive fruits can fling seeds away. Floating fruits may be water dispersed.How are these fruits dispersed?Dandelion CoconutMapleCocklebur


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WOU GS 311 - Life Cycle

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