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

The embryo sac of an angiosperm flower is best represented by which number in the above figure?

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

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?

Which of the following structures is incorrectly matched with function in the life cycle of an angiosperm?

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 (-).Which of the following models best illustrates the relationship of the Brazil nut tree and the other organisms associated with it?

Use the following information to answer the question(s)below. Scarlet gilia (Ipomopsis aggregata)usually has red flowers in an inflorescence of up to 250 flowers.In certain populations in the Arizona mountains,however,the flowers range from red to pink to white.In early summer,most of the flowers were red.Six to eight weeks later,the same individual plants were still present; the flowers ranged from pink to white,and few red flowers were present.The major pollinators early in the season were two species of hummingbirds active during the day; they emigrated to lower elevations,and the major pollinator later in the season was a hawk moth (a type of moth).The hawk moth was most active at sunset and later,and it preferred light pink to white flowers after dark.When hummingbirds were present,more red flowers than white flowers produced fruit.When only hawk moths were present,more white flowers produced fruit (K.N.Paige and T.G.Whitham.1985.Individual and population shifts in flower colour by scarlet gilia: A mechanism for pollinator tracking.Science 227:315-17). -Refer to the paragraph on scarlet gilia.Some plants changed their flowers to lighter colours,and some retained the same darker colour all season.Which plants do you expect produced more fruit?

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?

Arrange the following in the correct sequence,from earliest to most recent,in which these plant traits originated. 1)sporophyte dominance,gametophyte independence 2)sporophyte dominance,gametophyte dependence 3)gametophyte dominance,sporophyte dependence

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 generative cell nucleus?

The next few questions refer to the following description.Match the animal features with the appropriate angiosperm analogue. Oviparous (egg-laying)animals have internal fertilization (sperm cells encounter eggs within the female's body).Yolk and/or albumen is (are)provided to the embryo,and a shell is then deposited around the embryo and its food source.Eggs are subsequently deposited in an environment that promotes their further development,or are incubated by one or both parents. -The shell of an animal egg is what type of angiosperm analogue?

Reptilian embryos are protected from desiccation by a leathery shell.Similarly,which pair of structures protects seed plants' embryos and male gametophytes,respectively,from desiccation?

Which of the following can be found in gymnosperms?

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

Use the following information to answer the questions below. The Brazil nut tree,Bertholletia excels (n = 17),is native to tropical rain forests of South America.It is a hardwood tree that can grow to over 50 metres,is a source of high-quality lumber,and is a favourite nesting site for harpy eagles.As the rainy season ends,tough-walled fruits,each containing 8-25 seeds (Brazil nuts),fall to the forest floor.About $50 million worth of nuts are harvested each year.Scientists have discovered that the pale yellow,self-incompatible flowers of Brazil nut trees admit only female orchid bees as pollinators. -Animals that consume Brazil nuts are deriving nutrition mostly from tissue whose nuclei have how many chromosomes?

The closest relatives of the familiar pine and spruce trees are

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

What is the greatest threat to plant diversity?

Which number represents a megaspore mother cell in the figure above?

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 nucleus?

In addition to seeds,which of the following characteristics are unique to the seed-producing plants?