Exam 29: Seed Plants

After pollination delivers sperm to an ovule and the egg is fertilized, the ovule develops into a ____ and the integument becomes the ____.

Seeds may remain dormant ____, sprouting only when external conditions such as temperature and available moisture favor the seedling's growth.

Most of the creamy flesh of a corn kernel is ____ tissue.

Analysis of the nucleotide sequences of genes coding for phytochrome pigments suggest that the ancestors of angiosperms were adapted for survival in ____.

The ____ phylum consists of vascular, seed-bearing plants, including pines, spruces, firs, hemlocks, junipers, cypresses, and redwoods. Most of them are evergreens that form woody reproductive cones.

Living members of ____ are often the dominant land plants in cool temperate zones. Among other products, they are important sources of lumber, paper pulp, resins, and turpentine.

The "naked" seeds of conifers develop ____.

Situated in the center of the flower, the structure in which female gametophytes form is called the ____.

In the life cycle of a flowering plant, a single megaspore undergoes cytokinesis producing a female gametophyte that consists of ____ cells.

Support the argument that species in the grass family, Poaceae, are the most important seed plants today.

How is the seed of an angiosperm different than the seed of a gymnosperm?

In pine trees, megaspores develop within a(n) ____.

Darwin referred to the evolutionary origin of angiosperms as an "abominable mystery," because they seem to appear suddenly in the fossil record.

About 80% of all living gymnosperm species belong to the phylum ____.

The ____ phylum has an estimated 350,000 known living species of vascular, seed-bearing plants, and is the dominant group of land plants today.

Many angiosperm species ____ animal pollinators.

Which plant family provides the majority of calories that humans consume?

By 250 mya, the seed plants called ____ were our planet's dominant flora.

The male gametophytes of seed plants consist of a few cells enclosed by a sturdy wall made mostly of the resistant polymer ____.