Textbook Question
What does it mean to say that a life cycle is gametophyte dominant versus sporophyte dominant?
Ch. 28 - Green Algae and Land Plants
Freeman8th EditionBiological ScienceISBN: 9780138276263
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Table of contents
- Ch. 1 - Biology: The Study of Life13
- Ch. 2 - Water and Carbon: The Chemical Basis of Life14
- Ch.3 - Protein Structure and Function10
- Ch.4 - Nucleic Acids and the RNA World10
- Ch. 5 - An Introduction to Carbohydrates10
- Ch. 6 - Lipids, Membranes, and the First Cells11
- Ch. 7 - Inside the Cell10
- Ch. 8 - Energy and Enzymes: An Introduction to Metabolism10
- Ch. 9 - Cellular Respiration and Fermentation11
- Ch. 10 - Photosynthesis12
- Ch. 11 - Cell-Cell Interactions12
- Ch. 12 - The Cell Cycle8
- Ch. 13 - Meiosis12
- Ch. 14 - Mendel and the Gene23
- Ch. 15 - DNA and the Gene: Synthesis and Repair15
- Ch. 16 - How Genes Work16
- Ch. 17 - Transcription, RNA Processing, and Translation16
- Ch. 18 - Control of Gene Expression in Bacteria16
- Ch. 19 - Control of Gene Expression in Eukaryotes12
- Ch. 20 - The Molecular Revolution: Biotechnology, Genomics, and New Frontiers15
- Ch. 21 - Genes, Development, and Evolution12
- Ch. 22 - Evolution by Natural Selection16
- Ch. 23 - Evolutionary Processes13
- Ch. 24 - Speciation15
- Ch. 25 - Phylogenies and the History of Life13
- Ch. 26 - Bacteria and Archaea15
- Ch. 27 - Diversification of Eukaryotes16
- Ch. 28 - Green Algae and Land Plants16
- Ch. 29 - Fungi18
- Ch. 30 - An Introduction to Animals9
- Ch. 31 - Protostome Animals15
- Ch. 32 - Deuterostome Animals17
- Ch. 33 - Viruses16
- Ch. 34 - Plant Form and Function16
- Ch. 35 - Water and Sugar Transport in Plants16
- Ch. 36 - Plant Nutrition13
- Ch. 37 - Plant Sensory Systems, Signals, and Responses16
- Ch. 38 - Flowering Plant Reproduction and Development16
- Ch. 39 - Animal Form and Function17
- Ch. 40 - Water and Electrolyte Balance in Animals16
- Ch. 41 - Animal Nutrition16
- Ch. 42 - Gas Exchange and Circulation16
- Ch. 43 - Animal Nervous Systems16
- Ch. 44 - Animal Sensory Systems16
- Ch. 45 - Animal Movement11
- Ch. 46 - Chemical Signals in Animals16
- Ch. 47 - Animal Reproduction and Development16
- Ch. 48 - The Immune System in Animals16
- Ch. 49 - An Introduction to Ecology15
- Ch. 50 - Behavioral Ecology16
- Ch. 51 - Population Ecology16
- Ch. 52 - Community Ecology20
- Ch. 53 - Ecosystems and Global Ecology17
- Ch. 54 - Biodiversity and Conservation Ecology18
Chapter 28, Problem 4
Evaluate the following statements regarding seeds. Select True or False for each statement.
T/FThey contain an embryo.
T/FThey contain nutritive tissue for the embryo.
T/FThey consist entirely of diploid cells.
T/FThey are also referred to as spores.
Verified step by step guidance1
Understand the structure of a seed: A seed typically contains three main components - the embryo, the seed coat, and the nutritive tissue (endosperm or cotyledons). The embryo is the young plant that will develop into a new organism.
Evaluate the statement 'They contain an embryo': Since the embryo is a fundamental part of a seed, this statement is true. The embryo is the part of the seed that will grow into a new plant.
Evaluate the statement 'They contain nutritive tissue for the embryo': Seeds contain nutritive tissue, such as endosperm or cotyledons, which provide essential nutrients to the embryo during germination. Therefore, this statement is true.
Evaluate the statement 'They consist entirely of diploid cells': Seeds contain both diploid and haploid cells. The embryo is diploid, but the nutritive tissue can be triploid (as in the case of endosperm in angiosperms). Therefore, this statement is false.
Evaluate the statement 'They are also referred to as spores': Seeds and spores are different structures. Spores are typically single-celled and used for asexual reproduction, while seeds are multicellular and used for sexual reproduction. Therefore, this statement is false.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Seed Structure
Seeds are composed of three main parts: the embryo, the endosperm (or nutritive tissue), and the seed coat. The embryo is the young plant that will develop into a new plant, while the endosperm provides the necessary nutrients for the embryo's growth. Understanding these components is crucial for evaluating statements about seeds.
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Ploidy Levels in Seeds
Seeds contain cells with different ploidy levels. The embryo is typically diploid, resulting from the fusion of haploid gametes. However, the endosperm, which provides nutrition, is often triploid in angiosperms due to double fertilization. Recognizing these ploidy variations is essential for assessing statements about seed cell composition.
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Difference Between Seeds and Spores
Seeds and spores are both reproductive structures, but they differ significantly. Seeds are complex structures containing an embryo and nutritive tissue, while spores are usually single-celled and do not contain an embryo. Spores are primarily used by non-seed plants like ferns and fungi for reproduction. Understanding these differences helps in distinguishing between seeds and spores.
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Related Practice
Textbook Question
The evolution of cuticle presented plants with a challenge that threatened their ability to live on land. Describe this challenge, and explain why stomata represent a solution. Compare and contrast stomata with the pores found in liverworts.
Textbook Question
What important role does lignin play in vascular plants?
a. It is the major component of the cuticle, which prevents plants from drying out.
b. It forms the outer layer of pollen grains.
c. It forms the tough, rigid cell walls of water-conducting cells.
d. It nourishes the embryo in seed plants.
Textbook Question
Soils, water, and the atmosphere are major components of the abiotic (nonliving) environment. Describe how green plants affect the abiotic environment in ways that are advantageous to humans.
Textbook Question
The appearance of cuticle and stomata correlated with what event in the evolution of green plants?
a. The first upright growth forms
b. The first woody tissues
c. Growth on land
d. The evolution of the first water-conducting tissues
Textbook Question
What is a pollen grain?
a. sperm-producing gametophyte
b. egg-producing gametophyte
c. sperm-producing sporophyte
d. sperm