这是 Youtop 运营的独立目录页面，并非由 CrashCourse 或 YouTube 运营、赞助或认可。 提交更正. 你是这位创作者吗？认领此页面
Loading
这是 Youtop 运营的独立目录页面，并非由 CrashCourse 或 YouTube 运营、赞助或认可。 提交更正. 你是这位创作者吗？认领此页面
CrashCourse · 发布于 2012年10月8日
Hank introduces us to one of the most diverse and important families in the tree of life - the vascular plants. These plants have found tremendous success and their secret is also their defining trait: conductive tissues that can take food and water from one part of a plant to another part. Though it sounds simple, the ability to move nutrients and water from one part of an organism to another was an evolutionary breakthrough for vascular plants, allowing them to grow exponentially larger, store food for lean times, and develop features that allowed them to spread farther and faster. Plants dominated the earth long before animals even showed up, and even today hold the world records for the largest, most massive, and oldest organisms on the planet. Table of Contents 1) 3 Tissue Types 02:37 2) Primary Growth 03:04 3) Secondary Growth 03:28 4) Dermal Tissue 04:47 a) Epidermis 04:54 5) Parenchyma Cells 05:39 6) Vascular Tissue 05:58 7) Xylem 05:58 8) Collenchyma 07:10 9) Sclerenchyma 07:35 10) Ground Tissue 08:25 a) Mesophyll 08:17 b) Photosynthesis 08:47 11) Phloem 09:54 References http://www.uic.edu/classes/bios/bios100/lecturesf04am/lect17.htm http://www.deseretnews.com/article/700071982/Central-Utahs-Pando-worlds-largest-living-thing-is-threatened-scientists-say.html?pg=all http://www.popsci.com/science/article/2012-02/200000-year-old-patch-seagrass-worlds-oldest-living-organism 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
