BIOL108 Lecture 11: BIOL 108 - Lecture #11 - Land Plants
4 Oct 2016
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Biol 108 - lecture #11 - land plants. Most plants are land dwelling, but some have returned to the aquatic habitats (eg. seagrass) Undergoes alternation of generations: main groups of plants. Non vascular plants (no vascular bundles; eg. mosses) Gymnosperms (no flowers but has seeds; eg. conifers, pines) The move to life on land (~500 mya: benefits. There was more co2 available for photosynthesis. Above, there were vast resources of mineral nutrients. There weren"t many herbivores to eat the poor plants or pathogens to infect the plants: challenges. They adapted for survival and reproduction on land. Natural selection acted on these organisms, but adaptation took millions of. Charophytes years: land plants share a common ancestor with charophytes, synapormorphies with charophytes (shared with plants) Synapomorphy is a shared, derived state (eg. hair and mammary glands of mammals) Shared between different groups: rings of proteins in plasma membranes. Don"t see in other algae; very characteristic of charophytes: sperm.
