Chapter 27

An animal pollinator may be rewarded by ________when it visits a flower of a coevolved plant (choose all that apply). a. pollen b. nectar c. hormones d. fruit

The arrival of pollen grains on a receptive stigma is called ________. a. germination b. abscission c. pollination d. propagation

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

In flowers, the structures that produce male gametophytes are called________ ; the structures that produce female gametophytes are called________. a. pollen grains; flowers b. stamens; carpels c. anthers; stigma d. megaspores; microspores

Cotyledons develop as part of ________. a. carpels b. accessory fruits c. embryo sporophytes d. flowers

The three main parts of a typical mature eudicot seed are the________. a. pollen grain, egg, and seed coat b. embryo, endosperm, and seed coat c. megaspores, microspores, and ovule d. embryo, cotyledons, and seed coat

A new plant forms from a stem that broke off of the parent plant. This is an example of ________. a. nodal cloning b. exocytosis c. vegetative reproduction d. tissue culture propagation

Domesticated banana plants produce seedless fruit because they are ________. a. triploid b. monocots c. propagated by grafting d. treated with colchicine

Plant hormones________. a. trigger the same responses in animals and plants b. are cues for tropisms c. do not participate in stress responses d. may have different effects in different tissues

________is required for germination of all seeds. a. Light b. ABA c. Smoke d. Water

In some plants, flowering is a________response a. phototropic b. gravitropic c. photoperiodic d. thigmotropic

Match the response with its main trigger. ________phototropism ________gravitropism ________thigmotropism ________photoperiodism ________vernalization ________heliotropism a. contact with an object b. blue light c. a long period of cold d. gravity e. sun position f. night length

Which of the following statements is false? a. Auxin and gibberellin promote stem elongation. b. Cytokinin promotes cell division in shoot tips. c. Abscisic acid promotes water loss and dormancy d. Ethylene promotes fruit ripening and abscission.

Match the observation with the main hormone. ________ethylene ________cytokinin ________auxin ________gibberellin ________abscisic acid ________nitric oxide a. Your cabbage plants bolt (they form elongated flowering stalks). b. The potted plant in your room is leaning toward the window. c. Lateral buds are sprouting. d. The seeds of your roommate's marijuana plant do not germinate no matter what he does to them. e. The last of your apples is getting really mushy. f. Your lettuce plants develop brown spots on their leaves.