Plant Anatomy

Wood: Taxonomic Variation

Multiple Choice Quiz


1	Summer wood is:
		A)	the same as heartwood.
		B)	found to the outside of each annular ring of xylem.
		C)	found to the inside of each annular ring of xylem.
		D)	formed throughout the growing season.
		E)	only found in monocots.


2	Tension wood is found:
		A)	in gymnosperms, primarily.
		B)	on the lower side of branches.
		C)	to totally lack fibers.
		D)	to possess gelatinous fibers.
		E)	to have many large vessel members.


3	Libriform fibers are found in gymnosperms.
		A)	True
		B)	False


4	Paratracheal parenchyma may be found:
		A)	at the interface of spring and summer wood.
		B)	around wood rays.
		C)	in phloem.
		D)	in conifers.
		E)	around vessels.


5	The cavity of wood resin ducts is formed through:
		A)	lysigenous separation of tracheids.
		B)	lysigenous separation of endothelial cells
		C)	rexigenous separation of wood rays.
		D)	schizogenous separation of endothelial cells.
		E)	schizogenous separation of uniseriate rays.


6	Heterocellular rays contain:
		A)	vessels and tracheids.
		B)	fibers and vessels.
		C)	fibers and tracheids.
		D)	vessels and parenchyma.
		E)	tracheids and parenchyma.


7	Which is not a feature of osage-orange wood?
		A)	Tyloses in vessel members.
		B)	Paratracheal parenchyma.
		C)	Uniseriate rays.
		D)	Ring porous wood.
		E)	Libriform fibers.


8	An example of a diffuse-porous wood would be:
		A)	Oak.
		B)	Sugar maple.
		C)	Elm.
		D)	Osage-orange.
		E)	Ash.


9	Wood pulp may contain:
		A)	vessel members.
		B)	libriform fibers.
		C)	tracheids.
		D)	All of the above.
		E)	None of the above.


10	What plane of sectioning best shows bordered pits in wood?
		A)	Transverse
		B)	Radial
		C)	Tangential
		D)	Oblique
		E)	Periclinal

2003 McGraw-Hill Higher Education

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