Wood of Gymnosperms is composed of
Only tracheids in the xylem
Only vessels and xylem parenchyma
Only fibres and xylem parenchyma
Only fibres and vessels

Only vessels and xylem parenchyma

Only tracheids in the xylem

Only fibres and xylem parenchyma

Only fibres and vessels

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Solution

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The tracheids, long cells, that conduct water primarily through openings in their side walls are an integral part of gymnosperms. Most gymnosperms possess only tracheids in their xylem. So, the correct answer is option A.

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Question 33
The water conducting tissue generally present in gymnosperm is

(a) Vessels
(b) Sieve tube
(c) Tracheids
(d) Xylem fibres

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Match the following columns.

\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}

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Match the following in column I with column II and choose the correct combination from the options.

	List I		List II
A	Xylem vessels	1	Store food materials
B	Xylem tracheids	2	Obliterated lumen
C	Xylem fibre	3	Perforated plates
D	Xylem parenchyma	4	Chisel-like ends

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Consider the following statements
(a) Xylem transports water and minerals
(b) Gymnosperms lack sieve tubes and companion cells in phloem
(c) First formed primary xylem is called metaxylem
(d) Phloem fibres (bast fibres) are made of collenchyma
Of these statements

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Match and find the correct option

	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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Wood of Gymnosperms is composed ofOnly tracheids in the xylemOnly vessels and xylem parenchymaOnly fibres and xylem parenchymaOnly fibres and vessels

The tracheids, long cells, that conduct water primarily through openings in their side walls are an integral part of gymnosperms. Most gymnosperms possess only tracheids in their xylem. So, the correct answer is option A.

Wood of Gymnosperms is composed of
Only tracheids in the xylem
Only vessels and xylem parenchyma
Only fibres and xylem parenchyma
Only fibres and vessels