Chapter 30 Exercise

What are the products of meiosis in the life cycle of a seed plant?

Consider the seed shown in this figure. Select the correct description of this seed.

Select the correct statement describing the life cycle of angiosperms.

Which of these structures is a separate generation from the plant sporophyte?

In which of the following pairs do the structures play comparable roles in the plant and animal life cycles?

Which of these structures contains a male gametophyte?

In pines, the female gametophyte contains _____, each of which contains a(n) _____.

In pines, an embryo is a(n) _____.

In pine trees, pollen grains get to the ovule via the _____.

Of the four haploid cells produced by a pine cone's megasporocyte (megaspore mother cell), _____ survive(s).

In the pine, microsporangia form _____ microspores by _____.

Gymnosperms were most abundant during the _____.

In gymnosperms megaspores develop into _____ .

In pine, the embryo develops within the _____.

The major difference between angiosperms and gymnosperms comes from the _____.

Angiosperms are different from all other plants because only they have _____.

Unlike most angiosperms, grasses are pollinated by wind. As a consequence, some unnecessary parts of grass flowers have almost disappeared. Which of the following parts would you expect to be most reduced in a grass flower?

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

Suppose that the cells of seed plants, like the skin cells of humans, produce a pigment upon increased exposure to UV radiation. Rank the following cells, from greatest to least, in terms of the likelihood of producing this pigment. 1. cells of sporangium 2. cells in the interior of a subterranean root 3. epidermal cells of sporophyte megaphylls 4. cells of a gametophyte

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

Which trait(s) is (are) shared by many modern gymnosperms and angiosperms? 1. pollen transported by wind 2. lignified xylem 3. microscopic gametophytes 4. sterile sporophylls, modified to attract pollinators 5. endosperm

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

Which of the following are structures of angiosperm gametophytes?

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