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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 “wings” animals Some seeds have 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 Z e • 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 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
