Chapter 26
What is the ploidy of the following structures: gametophyte, seed, spore, sporophyte? a. 2n, 2n, 1n, 1n b. 1n, 2n, 1n, 2n c. 1n, 1n, 2n, 2n d. 2n, 1n, 2n, 1n
1n, 2n, 1n, 2n
Corn develops from a seedling with a single cotyledon, displays parallel veins on its leaves, and produces monosulcate pollen. It is most likely: a. a gymnosperm b. a eudicot c. a basal angiosperm d. a monocot
A monocot
Seed plants are _________. a. mostly homosporous with some heterosporous b. all homosporous c. mostly heterosporous with some homosporous d. all heterosporous
All heterosporous
Plants are a source of ________. a. All the choices are correct. b. fuel c. food d. medicine
All the choices are correct.
Pollen grains develop in which structure? a. carpel b. stigma c. filament d. anther
Anther
At what stage does the diploid zygote form? a. when the seeds drop from the tree b. at fertilization c. when the female cone begins to bud from the tree d. when the pollen tube begins to grow
At fertilization
White and sweet-smelling flowers with abundant nectar are probably pollinated by a. wind b. bees and butterflies c. birds d. flies
Bees and butterflies
In the northern forests of Siberia, a tall tree is most likely a: a. Ginkgo biloba b. gnetophyte c. cycad d. conifer
Conifer
Megasporocytes will eventually produce which of the following? a. male gametophyte b. pollen grains c. sporophyte d. female gametophyte
Female gametophyte
Besides the seed, what other major structure diminishes a plant's reliance on water for reproduction? a. flower b. spore c. pollen d. fruit
Flower
Which of the following plant structures is not a defense against herbivory? a. thorns b. spines c. nectar d. alkaloids
Nectar
In the course of double fertilization, one sperm cell fuses with the egg and the second one fuses with ________. a. the egg as well b. polar nuclei of the center cell c. synergids d. antipodal cells
Polar nuclei of the center cell.
Which of the following structures widens the geographic range of a species and is an agent of dispersal? a. flower b. seed c. leaf d. root
Seed
Which of the following structures in a flower is not directly involved in reproduction? a. anther b. style c. sepal d. stamen
Sepal
Which of the following traits characterizes gymnosperms? a. The gametophyte is the longest phase of the life cycle. b. After fertilization the ovary thickens and forms a fruit. c. Reproductive structures are located in a flower. d. The plant carries exposed seeds in modified leaves.
The plant carries exposed seeds in modified leaves.
In which of the following geological periods would gymnosperms dominate the landscape? a. Permian b. Carboniferous c. Eocene (present) d. Triassic
Triassic
Abundant and powdery pollen produced by small, indistinct flowers is probably transported by: a. bees and butterflies b. flies c. birds d. wind
Wind
