EPISODE · Feb 20, 2026 · 24 MIN
2026 選修生物II CH3-1 水和礦物質的吸收與運輸
from 雷比特生物空中講 · host 雷比特老師
解釋植物如何實現其無心臟的水分運輸過程，這趟旅程被比喻為「從土壤到天空的奇幻之旅」。首先闡述水如何經由根毛吸收並通過根部內皮層的卡氏帶進行嚴格篩選，確保只有選定的物質才能進入維管束。接著，詳細介紹水分長距離上升的主要驅動力，即內聚力-張力假說，解釋蒸散作用在葉片頂端產生張力，並依賴水分子間的內聚力形成水鏈來對抗重力。最後，提到雖然根壓提供次要的推力，但礦物質主要作為「乘客」溶解於水流中，被動地運送到植物各處，整個系統本質上是由太陽能驅動的精密物理過程。 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://g.co/gemini/share/ecb759a4c35e Powered by Firstory Hosting
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2026 選修生物II CH3-1 水和礦物質的吸收與運輸
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