2026 biology talkshow:綠色動脈-韌皮部的構造演化、微觀生理(選修生物II)

介紹植物體內負責輸送養分的韌皮部，將其比擬為精密的「物資調度官」，負責配送糖分與訊息分子。詳盡對比演化上的兩種物流系統：原始裸子植物如同「鄉間小徑」般低效但穩定的篩胞，以及被子植物如「高速公路」般高效串聯的篩管分子。為了騰出運輸空間，這些細胞演化出捨棄胞器的「去器官化」特徵，並高度仰賴相鄰的伴胞提供生命維持所需。最後解釋植物如何利用壓力流假說，無需心臟幫浦，僅靠滲透壓驅動水流，展現植物在生理構造與環境適應上的優雅智慧。聽完後可以自主進行線上測驗，檢視學習成效喔~(需要登入gemini) 測驗網址 https://gemini.google.com/share/242734fc9e98 Powered by Firstory Hosting

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2026 biology talkshow:綠色動脈-韌皮部的構造演化、微觀生理(選修生物II)

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