In their role as the male gametophyte generation of seed plants, pollen grains contain plant ____.

Which of the following traits is «of characteristic of plants? (a) fixed-in-place, (b) no cell wall, (c) photosynthesizing, (d) mostly land-dwelling.

All plants go through an alternation of generations in which one generation produces the reproductive cells called _______, while the alternate generation produces the reproductive cells that fuse in reproduction, _______ and _______.

As readers of the evolution section of this book know, a lack of genetic diversity can be harmful to a population of living things (see Chapter 17, page 308, for more). Can you think of an aspect of plant functioning that (a) has grown more sophisticated over evolutionary time and that (b) helps ensure genetic diversity among plants?

Plants (select all that apply):

a. obtain nutrition by consuming existing organic material.

b. obtain nutrition by performing photosynthesis.

c. produce much of Earth’s oxygen.

d. absorb atmospheric carbon dioxide.

e. are a cause of soil erosion.

Defining characteristics of plants include (select all that apply):

a. multicelled

b. hyphae

c. cell walls

d. reproduction through fruiting bodies

e. land-dwelling

In the alternation of generations seen in plants (select all that apply):

a. one generation produces flowers, the next does not.

b. one generation produces spores, the next produces eggs and sperm.

c. succeeding generations tend to be about the same size.

d. succeeding generations tend to differ in size.

e. all generations produce spores.

Only angiosperms (select all that apply):

a. perform photosynthesis.

b. produce seeds.

c. encase seeds in fruit.

d. have seeds containing endosperm.

e. have eggs encased in pollen grains.