Exam 30: Seed Plants

Use the information to answer the following question. Scarlet gilia (Ipomopsis aggregata) usually has red flowers. In certain populations in the Arizona mountains, however, the flowers range from red to pink to white. In early summer, most (but not all) of the flowers were red. In late summer, the same individual plants were still present; the flowers ranged from pink to white, and few red flowers were present. The table below describes the pollination process in these plants. Late in the season, when only hawk moths were present, researchers painted the red flowers white. Which of the following results is most likely in this situation?

Which of the following problems will likely increase if the human population continues to increase?

Use the information to answer the following question. Scarlet gilia (Ipomopsis aggregata) usually has red flowers. In certain populations in the Arizona mountains, however, the flowers range from red to pink to white. In early summer, most (but not all) of the flowers were red. In late summer, the same individual plants were still present; the flowers ranged from pink to white, and few red flowers were present. The table below describes the pollination process in these plants. Some plants continued to produce only dark (red) flowers whereas others produced lighter colored flowers later in the season. Which plants do you expect produced more fruit over the entire season?

In onions (Allium), cells of the sporophyte have 16 chromosomes within each nucleus. How many chromosomes should be in an endosperm nucleus?

Among plants known as legumes (beans, peas, alfalfa, clover, for example) 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. Which of the following statements best explains this observation?

The Brazil nut tree, Bertholletia excels, is native to tropical rain forests of South America. Scientists have discovered that the pale yellow flowers of Brazil nut trees cannot fertilize themselves and admit only female orchid bees as pollinators. If a female orchid bee has just left a Brazil nut tree with nectar in her stomach, and if she visits another flower on a different Brazil nut tree, what is the sequence in which the following events should occur?

In onions (Allium), cells of the sporophyte have 16 chromosomes within each nucleus. How many chromosomes should be in a megasporangium nucleus?

Which of the following statements about the pine life cycle is correct?

Which of the following is the most beneficial adaptation of the seed coats in angiosperm species whose seeds are dispersed by fruit-eating animals, as opposed to angiosperm species whose seeds are dispersed by other means?

Which of the following is a characteristic of all angiosperms?

In onions (Allium), cells of the sporophyte have 16 chromosomes within each nucleus. How many chromosomes should be in a tube cell nucleus?

Which of the following describes a difference between wind-pollinated angiosperms compared with animal pollinated plants? Wind pollenated plants ________.

In spruces and pines, which of the following is an advantage of having needlelike leaves?

The internal parts of the pollen grains of seed-producing plants are most similar to which of the following structures in seedless plants?

Where in an angiosperm would you find a megasporangium?

Which of the following organisms are the closest relatives of pine and spruce trees?

Immature seed cones of conifers are usually green before pollination, and flowers of grasses are inconspicuously colored. What does this indicate about how they are pollinated?

Which of the following is a characteristic that distinguishes gymnosperms and angiosperms from other plants?

The Brazil nut tree, Bertholletia excels, is native to tropical rain forests of South America. The agouti (Dasyprocta spp.), a cat-sized rodent, is the only animal with teeth strong enough to crack the hard wall of Brazil nut fruits. It typically eats some of the seeds, buries others, and leaves still others inside the fruit into which moisture can then enter and allow the remaining seeds to germinate. The agouti is most directly involved in dispersal of which of the following structures?

The Brazil nut tree, Bertholletia excels, is native to tropical rain forests of South America and produces large nuts. The large white part of a Brazil nut that people eat serves which of the following functions in nature?