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CrashCourse · 发布于 2012年10月16日
Hank gets into the dirty details about vascular plant reproduction: they use the basic alternation of generations developed by nonvascular plants 470 million years ago, but they've tricked it out so that it works a whole lot different compared to the way it did back in the Ordovician swamps where it got its start. Here's how the vascular plants (ferns, gymnosperms, and angiosperms) do it. Table of Contents 1) Sporophyte Dominance 01:55 2) Ferns 02:14 3) Gymnosperms 03:35 4) Angiosperms 05:33 5) Truth or Fail: Fruit Edition! 08:28 References: http://www.home.aone.net.au/~byzantium/ferns/about.html http://hcs.osu.edu/hcs300/gymno.htm http://www.msnucleus.org/membership/html/k-6/lc/plants/5/lcp5_5a.html http://faculty.unlv.edu/landau/gymnosperms.htm http://www.youtube.com/watch?v=AykzPemLs7Q&feature=relmfu http://extension.oregonstate.edu/mg/botany/flower2.html Crash Course is on Patreon! You can support us directly by signing up at http://www.patreon.com/crashcourse Want to find Crash Course elsewhere on the internet? Facebook - http://www.facebook.com/YouTubeCrashCourse Twitter - http://www.twitter.com/TheCrashCourse Instagram - https://www.instagram.com/thecrashcourse/ CC Kids: http://www.youtube.com/crashcoursekids
