Chapter Quiz


1	The earliest evidence of domesticated crops is in the New World approximately 4,000 years ago.
		A)	True
		B)	False


2	Russian geneticist, Nikolai Vavilov, is best known for his studies
		A)	of germplasm and plant propagation.
		B)	of cytogenics and crop plants.
		C)	relating cultivated plants with their wild ancestors.
		D)	all of the above.


3	Self-pollinating plants, such as peas, tomatoes, and peaches, tend to be homozygous.
		A)	True
		B)	False


4	The Green Revolution
		A)	enabled Mexico to quadruple its wheat production.
		B)	was proposed by Norman Borlaug.
		C)	uses high-yielding strains of crops.
		D)	B and C are correct.
		E)	all of the above.


5	Heirloom varieties produce more uniform plants than modern varieties because they are open pollinated and have a mixture of genotypes.
		A)	True
		B)	False


6	Which breeding method uses a chemical to strip the cell wall of plant cells of two sexually incompatible species?
		A)	mass selection
		B)	protoplast fusion
		C)	transformation
		D)	transpiration


7	Transgenic plants are created by splicing one gene out of a donor, inserting it into a vector and a host, followed by transformation of the plant with the cloned foreign material.
		A)	True
		B)	False


8	Which of the following is not a characteristic of a transgenic crop?
		A)	herbicide resistance
		B)	Bt insect resistance toxin
		C)	increased methionine content
		D)	none of the above


9	The success of a cutting depends on its ability to produce adventitious roots from stem buds.
		A)	True
		B)	False


10	Which method of plant propagation involves the use of girdling?
		A)	grafting
		B)	cuttings
		C)	layering
		D)	micropropagation


11	Grafting may produce genetically similar offspring but it is the one propagation method that does not ensure totipotency.
		A)	True
		B)	False


12	A(n) _______ is an excised piece of leaf or stem tissue used in micropropagation.
		A)	microshoot
		B)	medium
		C)	extant
		D)	scion


13	Tissue culture is a method of propagation that uses sterile Jell-O like media for plant growth.
		A)	True
		B)	False


14	Subculturing is similar to propagation by cuttings because
		A)	it separates multiple microshoots and places them in a medium.
		B)	it uses scions to produce new microshoots.
		C)	they both use in vitro growing conditions.
		D)	all of the above


15	Ex vitro propagation is always the best method because most plants grow slower in micropropagation than they do with more traditional methods.
		A)	True
		B)	False

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