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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. |
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2 | |
The most "derived" perforation plates are considered to be: |
| | A) | scalariform. |
| | B) | simple. |
| | C) | oblique and foraminate. |
| | D) | foraminate. |
| | E) | with beaks. |
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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. |
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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 |
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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 |
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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. |
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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. |
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8 | |
Closed vascular bundles are found in: |
| | A) | ferns and other lower plants. |
| | B) | gymnosperms. |
| | C) | dicots. |
| | D) | monocots. |
| | E) | all plants. |
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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. |
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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 |
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2003 McGraw-Hill Higher Education