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Plant Evolution

Plant Evolution. Plant Evolution. Evolved from green algae (450 mya) Both have chlorophyll, store energy as starch, DNA similarities Green algae ancestor Multicellular body Cells w/ channels to communicate Reproduce w/ sperm & egg Early plants Low growth. Land Adaptations.

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Plant Evolution

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  1. Plant Evolution

  2. Plant Evolution • Evolved from green algae (450 mya) • Both have chlorophyll, store energy as starch, DNA similarities • Green algae ancestor • Multicellular body • Cells w/ channels to communicate • Reproduce w/ sperm & egg • Early plants • Low growth

  3. Land Adaptations • Retain Moisture • Early plants grew near waters edge • Cuticle: waxy coating • Stomata: pores to allow gas exchange

  4. Land Adaptations • Transporting Resources • Vascular system: tissue to transport nutrients • Up from the roots (ex: water) • Down from the leaves (ex: sugars) • Allows taller growth

  5. Land Adaptations • Growing upright • Large plants need to support own weight • Lignin: hardens cell wall; gives wood strength

  6. Land Adaptations • Reproduction on land • Pollen: carried by wind/animals • Seeds: hard coat protects embryo inside

  7. Plant Ecology • Mutualistic relationships • Type of symbiosis where both organisms benefit • Ex: Plants (provides living space)/Bacteria (create nutrients) • Ex: Plants (provide food)/Insects (help pollinate) • Herbivore interactions • Defense adaptations • Spines, thorns, chemicals,

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