Plants; Question set 2

In angiosperms, which number in Figure 30.1 most nearly represents the event that initiates the formation of endosperm?

10

which number represents an embryo?

11

Which number represents a megaspore mother cell in Figure

3

Arrange the following in the correct sequence, from earliest to most recent, in which these plant traits originated. 1. sporophyte dominance, gametophyte independence 2. sporophyte dominance, gametophyte dependence 3. gametophyte dominance, sporophyte dependence

3 → 1 → 2

Meiosis is most likely to be represented by which number(s)

4

Within a gymnosperm megasporangium, what is the correct sequence in which the following should appear during development, assuming that fertilization occurs? 1. sporophyte embryo 2. female gametophyte 3. egg cell 4. megaspore

4 → 2 → 3 → 1

he embryo sac of an angiosperm flower is best represented by which number in Figure 30.1?

7

which number represents the mature gametophyte?

7

Which of the following is a true statement about angiosperm carpels?

Carpels surround and nourish the female gametophyte.

Which of the following statements is true of the pine life cycle?

Conifer pollen grains contain male gametophytes.

Which of the following statements correctly describes a portion of the pine life cycle?

Female gametophytes use mitosis to produce eggs.

All of the following cellular structures are functionally important in cells of the gametophytes of both angiosperms and gymnosperms

Haploid nuclei. Mitochondria. Cell walls. Peroxisomes.

Which of the following is true concerning flowering plants tissue?

The flower includes sporophyte tissue.

Given the differences between angiosperms and gymnosperms in the development of the integument(s), which of these statements is the most logical consequence?

The seed coats of angiosperms should be relatively thicker than those of gymnosperms.

What is true of stamens, sepals, petals, carpels, and pinecone scales?

They are modified leaves.

Which of the following statements is true of monocots?

They, along with the eudicots, magnoliids, and basal angiosperms, are currently placed in the phylum Anthophyta.

Which structure(s) must pass through the micropyle for successful fertilization to occur in angiosperms?

Two of the responses above are correct.

How have fruits contributed to the success of angiosperms?

by facilitating dispersal of seeds

The seed coat's most important function is to provide

desiccation resistance.

Which of the following is a characteristic of all angiosperms?

double internal fertilization

Oviparous (egg-laying) animals have internal fertilization (sperm cells encounter eggs within the female's body). Yolk and/or albumen is (are) provided to the embryo, and a shell is then deposited around the embryo and its food source. Eggs are subsequently deposited in an environment that promotes their further development, or are incubated by one or both parents. 72) The yolk and/or albumen of an animal egg is what type of angiosperm analog?

endosperm

Which of the following sex and generation combinations most directly produces the fruit?

female sporophyte

Which of the following sex and generation combinations most directly produces the integument of a pine seed?

female sporophyte

Which of the following sex and generation combinations most directly produces the megasporangium of pine ovules?

female sporophyte

In terms of alternation of generations, the internal parts of the pollen grains of seed-producing plants are most similar to a

fern gametophyte bearing only antheridia.

Which group is noted for the independence of gametophyte and sporophyte generations from each other?

ferns

Angiosperms are the most successful terrestrial plants. Which of the following features is unique to them and helps account for their success?

fruits enclosing seeds

Gymnosperms differ from both extinct and extant (living) ferns because they

have pollen.

Generally, wind pollination is most likely to be found in seed plants that grow

in dense, single-species stands.

Many mammals have skins and mucous membranes that are sensitive to phenolic secretions of plants like poison oak (Rhus). These secondary compounds are primarily adaptations that

inhibit herbivory.

Which of the following is most important in making the typical seed more resistant to adverse conditions than the typical spore?

integument(s)

Reptilian embryos are protected from desiccation by a leathery shell. Similarly, which pair of structures protects seed plants' embryos and male gametophytes, respectively, from desiccation?

integuments sporopollenin

Which of the following sex and generation combinations most directly produces the pollen tube?

male gametophyte

The generative cell of male angiosperm gametophytes is haploid. This cell divides to produce two haploid sperm cells. What type of cell division does the generative cell undergo to produce these sperm cells?

mitosis

process labeled "6" involves

mitosis.

Carpels and stamens are

modified sporophylls.

Angiosperm double fertilization is so-called because it features the formation of

one embryo involving one sperm cell and an endosperm involving a second sperm cell.

Which of the following flower parts develops into the pulp of a fleshy fruit?

ovary

Which of the following flower parts develops into a seed?

ovule

Which structure is common to both gymnosperms and angiosperms?

ovule

In addition to seeds, which of the following characteristics are unique to the seed-producing plants?

pollen

Which of the following can be found in gymnosperms?

pollen

Which trait(s) is (are) shared by many modern gymnosperms and angiosperms?

pollen transported by wind, lignified xylem, microscopic gametophytes

Which of the following are structures of angiosperm gametophytes?

pollen tubes

In seed plants, which of the following is part of a pollen grain and has a function most like that of the seed coat?

sporopollenin