Xylem fibres possess obliterated central lumen due to very thivk walls. This helps to perform function of
1) conduction
2)strorage of food
3) mecanical support
4) both 2 and 3

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Solution

Dear student,
Answer is 3). Central lumen of the Xylem fibres is indistinguishable and it is found between vessels and tracheids for providing support to essential elements.

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\begin{matrix} C o l u m n I & C o l u m n I I A . X y l e m v e s s e l s & 1. S t o r e f o o d m a t e r i a l s B . X y l e m t r a c h e i d s & 2. O b l i t e r a t e d l u m e n C . X y l e m f i b r e & 3. P e r f o r a t e d p l a t e s D . X y l e m p a r e n c h y m a & 4. C h i s e l - l i k e e n d s \end{matrix}

Which of the following has obliterated central lumen?

	I		II
(a)	Tracheids	(i)	Cells possess highly thickened walls with oblilateral central lumen
(b)	Vessels	(ii)	Elongated tube like cells with thick lignified walls and tapering ends
(c)	Xylem parenchyma	(iii)	Individual members are interconnected through perforations in their common walls
(d)	Xylem fibres	(iv)	Cells are living with thin cellulose cell wall.

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