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

The following questions refer to the description below. 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 structure is common to both gymnosperms and angiosperms?

In terms of alternation of generations, the internal parts of the pollen grains of seed-producing plants are most similar to a

In a typical angiosperm, what is the sequence of structures encountered by the tip of a growing pollen tube on its way to the egg? 1) micropyle 2) style 3) ovary 4) stigma

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

Use the letters A-D to label where on the phylogenetic tree each of the following derived characters appeared. A)flowers B)embryos C)seeds D)vascular tissue

In onions (Allium), cells of the sporophyte have 16 chromosomes within each nucleus. Match the number of chromosomes present in each of the onion tissues listed below. -How many chromosomes should be in a generative cell nucleus?

A botanist was visiting a tropical region for the purpose of discovering plants with medicinal properties. All of the following might be ways of identifying potentially useful plants except

The main way that pine trees disperse their offspring is by using

The following questions refer to the description below. 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.

The following questions refer to the generalized life cycle for land plants shown in Figure 30.1. 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. Figure 30.1 -In angiosperms, which number most nearly represents the event that initiates the formation of endosperm?

Arrange the following structures, which can be found on male pine trees, from the largest structure to the smallest structure (or from most inclusive to least inclusive). 1. sporophyte 2) microspores 3) microsporangia 4) pollen cone 5) pollen nuclei

Which of the following is an ongoing trend in the evolution of land plants?

The following questions refer to the description below. Match the animal features with the appropriate angiosperm analog. 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 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 following questions refer to the description below. 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. -What is True of stamens, sepals, petals, carpels, and pinecone scales?

In most pine species, pollen cones and seed (ovulate)cones are borne on the same tree. In a habitat where few air currents exist at, or near, the forest floor but nearly continuous in the tree canopy, which of these is the most adaptive arrangement of the two kinds of cones on pines in this habitat?

The following questions refer to the description below. Match the animal features with the appropriate angiosperm analog. 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. -Which of the following is a structure of angiosperm gametophytes?

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

Gymnosperms differ from both extinct and extant ferns because they

The following questions refer to the generalized life cycle for land plants shown in Figure 30.1. 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. Figure 30.1 -Which numbers represent haploid cells or tissues?

Which of the following flower parts develops into the pulp of a fleshy fruit?