Exam 30: Plant Diversity II: The Evolution of Seed Plants

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

Where in an angiosperm would you find a megasporangium?

The harpy eagle, Harpia harpyja, is the largest, most powerful raptor in the Americas. It nests only in trees taller than 25 meters. It is a "sloth specialist," but will also take agouti. Thus, if these eagles capture too many agoutis from a particular locale, they might contribute to their own demise by

Which of the following statements is true of monocots?

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 structure is common to both gymnosperms and angiosperms?

Among plants known as legumes (beans, peas, alfalfa, clover, etc.)the seeds are contained in a fruit that is itself called a legume, better known as a pod. Upon opening such pods, it is commonly observed that some ovules have become mature seeds, whereas other ovules have not. Thus, which of the following statements is (are)true? 1)The flowers that gave rise to such pods were not pollinated. 2)Pollen tubes did not enter all of the ovules in such pods. 3)There was apparently not enough endosperm to distribute to all of the ovules in such pods. 4)The ovules that failed to develop into seeds were derived from sterile floral parts. 5)Fruit can develop, even if all ovules within have not been fertilized.

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 makes them similar to many angiosperms? 1)They have exposed ovules. 2)They have flagellated sperm. 3)They are pollinated by animals.

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

Harold and Kumar are pre-med and pre-pharmacy students, respectively. They complain to their biology professor that they should not have to study about plants because plants have little relevance to their chosen professions. -It would be best for these students, and for society in the long run, if their biology professor responds by

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

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

Which of the following is not a characteristic that distinguishes gymnosperms and angiosperms from other plants?

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. -If one were to erect a new taxon of plants that included all plants that are pollinated by animals, and only plants that are pollinated by animals, then this new taxon would be

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?

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

The seed coat's most important function is to provide

Which of the following is true concerning flowering plants?

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

Entrepreneurs attempted, but failed, to harvest nuts from plantations grown in Southeast Asia. Attempts to grow Brazil nut trees in South American plantations also failed. In both cases, the trees grew vigorously, produced healthy flowers in profusion, but set no fruit. Consequently, what is the likely source of the problem?