Multiple Choice Quiz

1		Sclerenchyma cells are most characterized by:
			A)	vacuoles.
			B)	being isodiametric.
			C)	secondary walls.
			D)	having bordered pits.
			E)	capable of change in cell shape after maturity.
2		Libriform fibers are found in:
			A)	epidermis.
			B)	cortex.
			C)	phloem.
			D)	xylem.
			E)	pith
3		Ramiform pits are:
			A)	branched.
			B)	bordered.
			C)	characterized by having desmotubules.
			D)	half-bordered.
			E)	found in primary walls only.
4		Which is not true of brachysclereids?
			A)	May have living protoplasm upon maturity.
			B)	Normally idioblasts or in small clusters.
			C)	Plasmodesmata present.
			D)	Extensive lignified secondary walls.
			E)	Walls stain best with Aniline blue.
5		Sclereids develop from:
			A)	fibers.
			B)	parenchyma cells.
			C)	collenchyma cells.
			D)	apical meristems.
			E)	cork cambium.
6		Bast fibers are associated with:
			A)	collenchyma.
			B)	xylem.
			C)	phloem.
			D)	central ground tissue.
			E)	meristematic tissues.
7		Macrosclereids are commonly found in:
			A)	leaves.
			B)	seed coats.
			C)	root tips.
			D)	vascular bundles.
			E)	ground (storage) tissues.
8		Reaction wood of dicots allows for the flexibility of branches and is composed of what kind of fibers?
			A)	Gelatinous
			B)	Libriform
			C)	Hard
			D)	Bast
			E)	Extra-xylary
9		Flax fibers have:
			A)	heavy lignification.
			B)	an orientation in the xylem.
			C)	a high cellulose content to the cell walls.
			D)	no phenolics associated with them.
			E)	an isodiametric shape.
10		Which is not true of “hard” fibers?
			A)	Are found in leaves
			B)	Offer support
			C)	Have high lignification
			D)	Are more common in dicots
			E)	Are found in bundles