Exam 30: Plant Diversity Ii: the Evolution of Seed Plants

A researcher has developed two stains for use with seed plants. One stains sporophyte tissue blue; the other stains gametophyte tissue red. If the researcher exposes pollen grains to both stains, and then rinses away the excess stain, what should occur?

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

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

Use the following information to answer the questions below. In onions (Allium), cells of the sporophyte have 16 chromosomes within each nucleus. Match the number of chromosomes present in each of the following onion tissues. -How many chromosomes should be in an endosperm nucleus?

Gymnosperms and angiosperms have the following in common except

Over human history, which process has been most important in improving the features of plants that have long been used by humans as staple foods?

What is the greatest threat to plant diversity?

Use the following information to answer the questions below. The following questions refer to the generalized life cycle for land plants shown in the figure below. Each number within a circle or square represents a specific plant or plant part, and each number over an arrow represents either meiosis, mitosis, or fertilization. -Which number represents a megaspore mother cell in the figure above?

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

A fruit is most commonly

The seeds of orchids are among the smallest known, with virtually no endosperm and with miniscule seed leaves. Consequently, what should one expect to be true of such seeds?

The next few questions refer to the following description. The cycads, a mostly tropical phylum of gymnosperms, evolved about 300 million years ago and were dominant forms during the Age of the Dinosaurs. Though their sperm are flagellated, their ovules are pollinated by beetles. These beetles get nutrition (they eat pollen) and shelter from the microsporophylls. Upon visiting megasporophylls, the beetles transfer pollen to the exposed ovules. In cycads, pollen cones and seed cones are borne on different plants. Cycads synthesize neurotoxins, especially in the seeds, that are effective against most animals, including humans. -Which feature of cycads distinguishes them from most other gymnosperms? 1. They have exposed ovules. 2. They have flagellated sperm. 3. They are pollinated by animals.

Use the following information to answer the questions below. The following questions refer to the generalized life cycle for land plants shown in the figure below. Each number within a circle or square represents a specific plant or plant part, and each number over an arrow represents either meiosis, mitosis, or fertilization. -In the figure above, which number represents the mature gametophyte?

Use the following information to answer the questions below. In onions (Allium), cells of the sporophyte have 16 chromosomes within each nucleus. Match the number of chromosomes present in each of the following onion tissues. -How many chromosomes should be in a tube cell nucleus?

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

Cutting down rain forests can lead to

Ecologists often build models to depict the relationships between organisms. In such models, an arrow is used to link two organisms in a relationship. The arrowhead is next to the organism that is affected. If the effect is positive, the arrow is labeled with (+), and if negative, then the label is (-). Capuchin monkeys have been known to use rocks to smash open the fruits of Brazil nut trees. On the rare occasions this has been observed, the monkeys consume all of the Brazil nuts. Thus, which of the following correctly depicts the relationship between capuchin monkeys and Brazil nut trees?

Use the following information to answer the questions below. In onions (Allium), cells of the sporophyte have 16 chromosomes within each nucleus. Match the number of chromosomes present in each of the following onion tissues. -How many chromosomes should be in an embryo sac nucleus?

Which of the following is a characteristic of all angiosperms?

Use the following information to answer the questions below. The following questions refer to the generalized life cycle for land plants shown in the figure below. Each number within a circle or square represents a specific plant or plant part, and each number over an arrow represents either meiosis, mitosis, or fertilization. -In angiosperms, which number in the above figure most nearly represents the event that initiates the formation of endosperm?