Chapter 28

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

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

The ___ of a flower contains one or more ovaries in which eggs develop, fertilization occurs, and seeds mature.

In plants, 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.

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

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

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

The three main parts of a 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 and fell to the ground. This is an example of ___. a. tissue culture propagation b. exocytosis c. asexual reproduction d. nodal cloning.

Banana plants produce seedless fruit because they are ___. a. triploid b. monocots c. propagated by grafting 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. all of the above.

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

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 response with its main trigger. $$ \text { phototropism } \quad \quad\quad\quad\quad \text { a. mechanical stimulation } $$ $$ \text { gravitropism } \quad \quad\quad\quad\quad \text { b. blue light } $$ $$ \text { thigmotropism } \quad \quad\quad\quad\quad \text { c. a long period of cold } $$ $$ \text { photoperiodism } \quad \quad\quad\quad\quad \text { d. gravity } $$ $$ \text { vernalization } \quad \quad\quad\quad\quad \text { e. night length } $$

Match the observation with the hormone. $$ \text { ethylene } \quad \quad\quad\quad\quad \text { a. Your cabbage plants bolt (they form elongated flowering stalks.} $$ $$ \text { cytokinin } \quad \quad\quad\quad\quad \text { b. The potted plant in your room is leaning toward the window. } $$ $$ \text { auxin } \quad \quad\quad\quad\quad \text { c. The last of your apples is getting really mushy. } $$ $$ \text { gibberellin } \quad \quad\quad\quad\quad \text { d. The seeds of your roommate's marijuana plant do not germinate no matter what he does to them.} $$ $$ \text { abscisic acid } \quad \quad\quad\quad\quad \text { e. Lateral buds are sprouting. } $$