Chapter 28

The ______ of a flower contains one or more ovaries in which eggs develop, fertilization occurs, and seeds mature. a. pollen sac b. carpel c. receptacle d. sepal

Seeds are mature ________ ; fruits are mature ________ . a. ovaries; ovules b. ovules; stamens c. ovules; ovaries d. stamens; ovaries

After meiosis within pollen sacs, haploid ________ form. a. megaspores b. microspores c. stamens d. sporophytes

After meiosis in an ovule, _________ megaspores form. a. two b. four c. \(\operatorname{six}\) d. eight

The seed coat forms from the _______ . a. ovule wall b. ovary c. endosperm d. residues of sepals

Cotyledons develop as part of _______ . a. carpels b. accessory fruits c. embryo sporophytes d. petioles

By ________, a new plant forms from a tissue or structure that drops or is separated from the parent plant. a. parthenogenesis b. exocytosis c. vegetative growth d. nodal growth

Which of the following statements is false? a. Auxins and gibberellins promote stem elongation. b. Cytokinins promote cell division, retard leaf aging. c. Abscisic acid promotes water loss and dormancy. d. Ethylene promotes fruit ripening and abscission.

Plant hormones ________ . a. interact with one another b. are influenced by environmental cues c. are active in plant embryos within seeds d. are active in adult plants e. all of the above

_________ is the strongest stimulus for phototropism. a. Red light b. Far-red light c. Green light d. Blue light

________ light makes phytochrome switch from inactive to active form; ________ light has the opposite effect. a. red; far-red b. red; blue c. far-red; red d. far-red; blue

Flowering is a _______ response. a. phototropic b. gravitropic c. photoperiodic d. thigmotropic

Match the terms with the most suitable description. ______ovule ______receptacle ______double fertilization ______anther ______carpel ______mature female gametophyte ______mature male gametophyte a. pollen tube together with its contents b. embryo sac of seven cells, one with two nuclei c. starts out as cell mass in ovary; may become a seed d. female reproductive part e. pollen sacs inside f. base of floral shoot g. formation of zygote and first cell of endosperm