Chapter 27

The arrival of pollen grains on a receptive stigma is called _____.

An animal pollinator may receive _____ when it visits a flower of a coevolved plant (choose all that apply). a. pollen c. pesticides b. nectar d. fruit

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

In flowers, the structures that produce male gametophytes are called _____ \(;\) those that produce female gametophytes are called _____. a. pollen grains; flowers c. anthers; stigma b. stamens; carpels d. megaspores; microspores

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

In some species, exposure to _____ is a trigger for seed germination. a. light c. smoke b. cold d. all can be triggers

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 c. asexual reproduction b. exocytosis d. tissue culture propagation

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

Plant hormones _____. a. often have multiple, overlapping effects b. are active in developing plant embryos c. are active in adult plants d. may have different effects in different tissues e. all of the above

In some plants, flowering is a _____ response. a. phototropic c. photoperiodic b. gravitropic 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 a. Your cabbage plants bolt (they form elongated flowering stalks). b. The potted plant in your room is leaning toward the window. c. The last of your apples is getting really mushy. d. The seeds of your roommate's marijuana plant do not germinate no matter what he does to them. e. Lateral buds are sprouting.