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Multiple Choice Quiz

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Vascular Tissues: Xylem

Multiple Choice Quiz



1

After primary growth is mature, elements of the protoxylem are:
A)recognized by circular or spiral secondary wall thickenings.
B)transformed into metaxylem.
C)active in water conduction.
D)differentiated into tracheids.
E)crushed beyond recognition.
2

The most "derived" perforation plates are considered to be:
A)scalariform.
B)simple.
C)oblique and foraminate.
D)foraminate.
E)with beaks.
3

Crassulae are represented by:
A)thickened end-walls of tracheids.
B)pitting in vessel members.
C)primary wall thickenings between bordered pits.
D)the secondary wall covering a margo and torus.
E)ray tracheids.
4

Which sequence of progression is correct?
A)Scalariform pitting-alternate pitting-opposite pitting-annular thickening-helical thickening
B)Helical thickening-alternate pitting-annular pitting-reticulate pitting-scalariform pitting
C)Annular thickening-scalariform pitting-reticulate pitting-alternate pitting-opposite pitting
D)Helical thickening-reticulate pitting-scalariform pitting-opposite pitting>alternate pitting
E)Annular thickening-alternate pitting-opposite pitting-scalariform pitting-reticulate pitting
5

Which is not found in a monocot (e.g. corn) vascular bundle?
A)Metaxylem
B)Sclerified bundle sheath
C)Protoxylem lacuna
D)Metaphloem
E)Cambium
6

A bicollateral vascular bundle:
A)has phloem on both sides of the xylem.
B)has xylem on both sides of the phloem.
C)is represented by the fusion of two vascular bundles.
D)possesses no vascular cambium.
E)has only one layer of xylem and of phloem.
7

Half-bordered pits are found between:
A)ray and axial tracheids.
B)tracheid and parenchyma cell.
C)two vessel members.
D)two tracheids.
E)two parenchyma cells.
8

Closed vascular bundles are found in:
A)ferns and other lower plants.
B)gymnosperms.
C)dicots.
D)monocots.
E)all plants.
9

In ferns, scalariform thickenings of tracheary elements:
A)do not allow the plant cell to elongate.
B)are transformed into reticulate thickenings.
C)form simple pits.
D)are deposited during the early growth and elongation.
E)cannot be seen in macerated preparations.
10

What are the best features of derived vessel members?
A)Long, inclined perforation plates, simple openings, no pits
B)Short, wide cells, simple openings, pits
C)Long, tapered end-walls, pits, reticulate openings
D)Short, narrow cells, reticulate openings, no pits
E)Long, scalariform perforation plates, pits, straight end-walls