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Plant Evolution

Plant Evolution

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Plant Evolution

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  1. PlantEvolution

  2. Plant Evolution Evolved from green algae (450 mya) Multicellular Autotrophs Land Adaptations 1) Retain Moisture 2) Transport nutrients 3) Growing upright 4) Reproducing on land

  3. Land Adaptations Problem: Retain Moisture Solution: Cuticle waxy coating prevents water loss cuticle

  4. Land Adaptations Problem: Transporting Resources Solution: Vascular system tubes to transport nutrients Up from the roots; down from the leaves Allows taller growth glucose water

  5. Land Adaptations Problem: Growing upright Solution: Lignin hardens cell wall gives wood strength mortar lignin

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

  7. Alternation of Generations Plants alternate between a diploid organism and a haploid organism Sporophyte (diploid) Zygote created Zygote grows into adult sporophyte Sporophyte makes spores Gametophyte (Haploid) Spores grow into a gametophyte Male gametophyte creates sperm Female gametophyte creates egg Sporophyte restarts when egg and sperm make zygote X X X X X

  8. Kobe Kuiz • What traits do plants and plant-like protista share? • Name 4 adaptations that plants have for life on land. • Which plant adaptation allows them to carry nutrients to great heights? • Which plant adaptation allows them to retain moisture? • What is the purpose of lignin? • What is the chromosome combination for the sporophyte stage? • What is the chromosome combination for the gametophyte stage? • What does the gametophyte stage create? • What does the sporophyte stage create?