Gymnosperms.

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Presentation transcript:

Gymnosperms

Group 3: Seed producing, Vascular Plants Gymnosperms Cycads Ginko Conifers Angiosperms

Seeds and their advantages 1) Seed plants don’t depend on water to reproduce Pollen (contains sperm) carried by wind/animals Zygote hardens into a seed 2) Embryo has… Nourishishment: Nutrients inside feed embryo Protection: Hard shell 3) Allow dispersal Carried by wind, water, animals Some seeds are “dispersed” by animals Some seeds have “wings”

Seeds and their advantages 1) Seed plants don’t depend on water to reproduce Pollen (contains sperm) carried by wind/animals Zygote hardens into a seed 2) Embryo has… Nourishishment: Nutrients inside feed embryo Protection: Hard shell 3) Allow dispersal Carried by wind, water, animals

Seeds and their advantages 1) Seed plants don’t depend on water to reproduce Pollen (contains sperm) carried by wind/animals Zygote hardens into a seed 2) Embryo has… Nourishishment: Nutrients inside feed embryo Protection: Hard shell 3) Allow dispersal Carried by wind, water, animals

Group 3: Seed producing, Vascular Plants Type 1: Gymnosperms Needle-like leaves (reduces water loss) Common to lumber industry Seeds enclosed in cones Male cones: produce pollen (pollen cone) Female cones: produce eggs (seed sone) Zygote hardens into seed (protected inside cones) Ex: Evergreen, Pine, Redwood, Cedar

Conifer Life Cycle . Sporophyte phase (dominant) Cones grow on tree Male cones Spores created by meiosis & released Spores develop into pollen Female cones Spores created by meiosis Egg forms inside spore Male pollen lands on female cone Pollen tube grows towards egg Sperm travels down pollen tube Spore hardens into seed Seed released & grows into new sporophyte . p seed Z e

Conifer Life Cycle Sporophyte phase (dominant) Cones grow on tree Male cones Spores created by meiosis & released Spores develop into pollen Female cones Spores created by meiosis Egg forms inside spore Male pollen lands on female cone Pollen tube grows towards egg Sperm travels down pollen tube Spore hardens into seed Seed released & grows into new sporophyte

female male

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