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Chapter 17: Problem 3

Angiosperms are different from all other plants because only they have a. a vascular system. b. flowers. c. seeds. d. a dominant sporophyte phase.

Short Answer

Expert verified
b. flowers.

Step by step solution

01

- Identify Key Characteristics of Angiosperms

Angiosperms, also known as flowering plants, are a large group of plants known for their unique feature - the production of flowers. Key characteristics include having a vascular system, producing seeds, and exhibiting a dominant sporophyte phase.
02

- Eliminate Options

Examine which of the given options apply exclusively to angiosperms. 1. Vascular system: Present in many plant groups including ferns and gymnosperms, not exclusive to angiosperms. 2. Flowers: Unique to angiosperms. 3. Seeds: Present in both angiosperms and gymnosperms. 4. Dominant sporophyte phase: Found in many plants including ferns and gymnosperms.
03

- Choose the Correct Option

Based on the elimination process in Step 2, the characteristic that uniquely defines angiosperms is the presence of flowers.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

flowers
Angiosperms are unique in the plant kingdom because they produce flowers. Flowers are specialized structures designed for reproduction. They attract pollinators, which help in the transfer of pollen from one flower to another, ensuring genetic diversity. Flowers consist of several parts including petals, sepals, stamens, and pistils. Each part plays a specific role in the reproductive process. The petals are often colorful and fragrant to attract pollinators, while the stamens and pistils are involved in the production of seeds. Understanding the structure and function of flowers is key to understanding what makes angiosperms so diverse and widespread.
vascular system
Like other higher plants, angiosperms have a complex vascular system. This system is responsible for the transport of water, nutrients, and sugars throughout the plant. The vascular system consists of two main types of tissues: xylem and phloem. The xylem carries water and dissolved minerals from the roots to the rest of the plant, while the phloem distributes the products of photosynthesis from the leaves to other parts of the plant. This efficient transport system allows angiosperms to grow larger and live in various environments.
sporophyte phase
The life cycle of angiosperms features a dominant sporophyte phase. In plant biology, sporophytes are the diploid multicellular stage that produces spores through meiosis. In angiosperms, the sporophyte phase is the most prominent and includes the entire structure of the plant that we recognize, including stems, leaves, and flowers. The transition from the sporophyte phase to the gametophyte phase occurs within the flowers, where the reproductive organs are located. This phase dominance helps angiosperms allocate resources efficiently for growth and reproduction, making them highly successful in diverse habitats.
seeds
Angiosperms produce seeds, which are critical for reproduction and survival. Seeds develop from the fertilized ovules within the ovaries of flowers. Once mature, seeds contain an embryo, a food supply, and a protective seed coat. This allows the seed to remain dormant until conditions are suitable for germination. Seeds can be dispersed by various methods including wind, water, and animals. This adaptive trait enables angiosperms to colonize new areas effectively. Although gymnosperms also produce seeds, the seeds of angiosperms are usually enclosed within a fruit, which adds an extra layer of protection and aids in dispersal.

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Most popular questions from this chapter

Which of the following terms includes all the others? a. angiosperm b. gymnosperm c. vascular plant d. fern e. seed plant

The eggs of seed plants are fertilized within ovules, and the ovules then develop into a. seeds. b. spores. c. fruit. d. sporophytes.

Which of the following groups is made up exclusively of fungi that form symbioses with plant roots? a. ascomycetes b. basidiomycetes c. glomeromycetes d. zygomycetes

Truffles (the fungi, not the chocolates) are the reproductive bodies of ascomycetes that form mycorrhizae with certain tree species. They are highly prized by gourmets for the delicious scent they add to food. Because truffles grow underground, they are difficult to find-human noses are not sensitive enough to locate them. Many animals, however, are excellent truffle hunters and eagerly consume the fungi. Why would these fungi produce a scent that attracts fungus-eating animals?

In April 1986 , an accident at a nuclear power plant in Chernobyl, Ukraine, scattered radioactive fallout for hundreds of miles. In assessing the biological effects of the radiation, researchers found mosses to be especially valuable as organisms for monitoring the damage. As mentioned in Module 10.16 , radiation damages organisms by causing mutations. Explain why it is faster to observe the genetic effects of radiation on mosses than on plants from other groups. Imagine that you are conducting tests shortly after a nuclear accident. Using potted moss plants as your experimental organisms, design an experiment to test the hypothesis that the frequency of mutations decreases with the organism's distance from the source of radiation
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