From OXFORD New Mastering Basic Concepts Book 1
p.202-203
In Vascular bundle, xylem(transports water and minerals)
phloem(transports foods)
But when I do the past paper which chapter is Photosynthesis Mc 1997 no.18
I need to know that which of them is/are the death-cell.
有關bio quickquickquick
2007-11-13 8:35 am
回答 (1)
2007-11-14 1:43 am
✔ 最佳答案
當然xylem是 dead-cell啦~因為xylem呢個組織既中心已經完全degenerate，所以無晒cell既function(無nucleus)‧而Phloem就由兩種cell組成，一種係sieve tube element，呢隻野本身無nucleus，但係隔離既companion cell(有nucleus)就負責控制sieve tube element既cellular function，所以phloem並不是死的‧
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