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Lignified

Lignified

Converted into wood.


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Re: water movement in xylem

... body . The tracheids, vessel elements, and sieve-cells are all lines with pits and have perforations and open discs for transport. Xylem does have lignified cell walls, but they're covered in the pits for diffusion. 2) You have it pretty spot-on with tracheids. They're long vascular cells that ...

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by Ariamezzo
Sat Feb 26, 2011 11:46 am
 
Forum: Botany Discussion
Topic: water movement in xylem
Replies: 2
Views: 7208

water movement in xylem

1. Is the wall of the xylem lignified and completely impermeable to water? If so how come the pressure flow theory (which deals with translocation of materials in phloem) states that when the photosynthetic source is loaded with sugar, ...

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by ribosome911
Tue Jan 25, 2011 7:32 am
 
Forum: Botany Discussion
Topic: water movement in xylem
Replies: 2
Views: 7208

A cry for help in terms of the IBO

... contact with each other. 2.What are sieve tubes? 3.what is the main carbohydrate translocated in the sieve tubes of a flowering plant 4.what is a lignified wall and how does it prevent xylem vessels from collapsing-or maybe it doesn't-help :shock: 5. Does a mammalian heart pump equal volumes of ...

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by asecond
Sat Jul 12, 2008 4:12 am
 
Forum: Cell Biology
Topic: A cry for help in terms of the IBO
Replies: 2
Views: 1920

Peaches and Almonds?

... one is a sweet one ( Amygdalus communis var. sativa ). Their fruit primordia are harvested and eaten whole, including the stone which is not lignified yet. In autumn rape fruits (drupes) are harvested and their seeds are chiped off and being sold on the bazaars or exported. We know them as ...

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by SU_reptile
Wed Sep 06, 2006 6:21 pm
 
Forum: Botany Discussion
Topic: Peaches and Almonds?
Replies: 2
Views: 3854


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