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Byju's Answer
Standard XII
Biology
T.S of Dicot and Monocot Root
are elongated...
Question
_____________ are elongated or tube-like dead cells with hard, thick and lignified walls.
A
Tracheids
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B
Sieve elements
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C
Phloem parenchyma
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D
All the above
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Solution
The correct option is
A
Tracheids
Xylem tracheids:
They are elongated or tube-like dead cells with hard, thick and lignified walls.
Their ends are tapering, blunt or chisel-like. These cells are devoid of protoplast.
They have large lumen without any content.
Their function is conduction of water and providing mechanical support to the plant.
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Similar questions
Q.
Hard, lignified, thick-walled, long and pointed cells of a plant are seen in:
Q.
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.
Q.
Which of the following tissues has dead cells with thick and lignified cell walls, having a few or numerous pits?
Q.
Match the column:
List I
List II
A) Tracheids
I) Cells possess highly thickened walls with oblilateral central human
B) Vessels
II) Elongated tube like cells with thick lignified walls and tapering ends
C) Xylem parenchyma
III) Individual members are interconnected through perorations in their common walls
D) Xylem fibers
IV) Cells are living with thin cellulosic cell walls
Q.
Assertion :Xylem vessel is a long cylindrical tube like-structure made up of many cells each with lignified walls Reason: Presence of vessels is a characteristic feature of gymnosperms
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