Chapter 38, Problem 3
'Bt maize' a. is resistant to various herbicides, making it practical to weed rice fields with those herbicides. b. contains transgenes that increase vitamin A content. c. includes bacterial genes that produce a toxin that reduces damage from insect pests. d. is a 'boron (B)-tolerant' transgenic variety of maize.
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A fruit is a. a mature ovary. b. a mature ovule. c. a seed plus its integuments. d. an enlarged embryo sac.
Double fertilization means that a. flowers must be pollinated twice to yield fruits and seeds. b. every egg must receive two sperm to produce an embryo. c. one sperm is needed to fertilize the egg, and a second sperm is needed to fertilize the polar nuclei. d. every sperm has two nuclei.
Which statement concerning grafting is correct? a. Stocks and scions refer to twigs of different species. b. Stocks and scions must come from unrelated species. c. Stocks provide root systems for grafting. d. Grafting creates new species.