L9 - L9 Transition to Land How do plants reproduce in Dry...

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L9 – Transition to Land: How do plants reproduce in Dry Conditions: Reproduction out of Water: Non-vascular plants + Ancient Vascular plants require water for fertilization Loss of reliance on swimming gametes *spores important* Land Plants: 1. Gametes were produced in complex multicellular structures *Distrinctive Male + Female gametangia Sperm producing = antheridium; Egg = Archeridium 2. Embryophytes = zygote retained on the gametophyte after fertilization + develops into a multicellular embryo that remains attached to parent + nourished o In Green Algae , only zygote is diploid Alteration of Generation – Key Steps: 1. Haploid Gametophytes produce haploid gametes by mitosis 2. Two Gametes unite during fertilization to form Diplod Zygote 3. Zygote divides by mitosis to grow into multicellular Diploid Sporophyte 4. Sporophyte produces haploid spores by meiosis 5. Spores divide by mitosis to develop haploid gametophyte **ALL Land Plants Under Go ALTERNATION of GENERATIONS* Homosporous & Heterosporous Plants: 1.
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