Textbook Question
Heartwood and sapwood consist of
a. Bark
b. Periderm
c. Secondary xylem
d. Secondary phloem
Ch. 35 - Vascular Plant Structure, Growth, and Development
Urry12th EditionCampbell BiologyISBN: 9785794169850
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Table of contents
- Ch. 1 - Evolution, the Themes of Biology, and Scientific Inquiry8
- Ch. 2 - The Chemical Context of Life8
- Ch. 3 - Water and Life6
- Ch. 4 - Carbon and the Molecular Diversity of Life9
- Ch. 5 - The Structure and Function of Large Biological Molecules9
- Ch. 6 - A Tour of the Cell6
- Ch. 7 - Membrane Structure and Function6
- Ch. 8 - An Introduction to Metabolism6
- Ch. 9 - Cellular Respiration and Fermentation10
- Ch. 10 - Photosynthesis7
- Ch. 11 - Cell Communication7
- Ch. 12 - The Cell Cycle11
- Ch. 13 - Meiosis and Sexual Life Cycles10
- Ch. 14 - Mendel and the Gene Idea14
- Ch, 15 - The Chromosomal Basis of Inheritance6
- Ch. 16 - The Molecular Basis of Inheritance9
- Ch. 17 - Gene Expression: From Gene to Protein9
- Ch. 18 - Regulation of Gene Expression10
- Ch. 19 - Viruses6
- Ch. 20 - DNA Tools and Biotechnology7
- Ch. 21 - Genomes and Their Evolution8
- Ch. 22 - Descent with Modification: A Darwininan View of Life6
- Ch. 23 - The Evolution of Populations5
- Ch. 24 - The Origin of Species6
- Ch. 25 - The History of Life on Earth8
- Ch. 26 - Phylogeny and the Tree of Life8
- Ch. 27 - Bacteria and Archaea6
- Ch. 28 - Protists7
- Ch. 29 - Plant Diversity I: How Plants Colonized Land7
- Ch. 30 - Plant Diversity II: The Evolution of Seed Plants6
- Ch. 31 - Fungi5
- Ch. 32 - An Overview of Animal Diversity4
- Ch. 33 - An introduction to Invertebrates6
- Ch. 34 - The Origin and Evolution of Vertebrates7
- Ch. 35 - Vascular Plant Structure, Growth, and Development10
- Ch. 36 - Resource Acquisition and Transport in Vascular Plants8
- Ch. 37 - Soil and Plant Nutrition11
- Ch. 38 - Angiosperm Reproduction and Biotechnology8
- Ch. 39 - Plant Responses to Internal and External Signals8
- Ch. 40 - Basic Principles of Animal Form and Function8
- Ch. 41 - Animal Nutrition7
- Ch. 42 - Circulation and Gas Exchange7
- Ch. 43 - The Immune System5
- Ch. 44 - Osmoregulation and Excretion6
- Ch. 45 - Hormones and the Endocrine System8
- Ch. 46 - Animal Reproduction9
- Ch. 47 - Animal Development8
- Ch. 48 - Neurons, Synapses, and Signaling6
- Ch. 49 - Nervous Systems8
- Ch. 50 - Sensory and Motor Mechanisms5
- Ch. 51 Animal Behavior6
- Ch. 52 - An Introduction to Ecology and the Biosphere7
- Ch. 53 - Population Ecology9
- Ch. 54 - Community Ecology9
- Ch. 55 - Ecosystems and Restoration Ecology8
- Ch. 56 - Conservation Biology and Global Change6
Chapter 35, Problem 6
The root pericycle is the site where
a. Secondary growth originates.
b. Root hairs originate.
c. Lateral roots originate.
d. The endodermis originates.
Verified step by step guidance1
Understand the structure of a plant root: The root is composed of several layers, including the epidermis, cortex, endodermis, pericycle, and vascular tissues.
Identify the role of the pericycle: The pericycle is a layer of cells located just inside the endodermis and is part of the vascular cylinder in roots.
Consider the function of the pericycle: The pericycle is known for its role in the formation of lateral roots, which are essential for increasing the root system's reach and stability.
Differentiate between the options: Secondary growth typically occurs in the vascular cambium, root hairs originate from the epidermis, and the endodermis is a separate layer from the pericycle.
Conclude based on the function of the pericycle: Given its role in lateral root formation, the correct answer is that lateral roots originate from the pericycle.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Root Pericycle
The root pericycle is a layer of cells found just inside the endodermis in plant roots. It plays a crucial role in the formation of lateral roots, as it is the site where these roots originate. The pericycle is also involved in secondary growth in some plants, contributing to the thickening of roots.
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Root System
Lateral Roots
Lateral roots are roots that extend horizontally from the primary root, increasing the root system's surface area and enhancing the plant's ability to absorb water and nutrients. They originate from the pericycle, which is why understanding the pericycle's role is essential for comprehending how lateral roots develop.
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Secondary Growth
Secondary growth refers to the increase in thickness or girth of plant organs, primarily stems and roots, due to the activity of the vascular cambium and cork cambium. In roots, secondary growth can involve the pericycle, which contributes to the formation of new vascular tissues, aiding in the plant's structural support and nutrient transport.
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Related Practice
Textbook Question
The phase change of an apical meristem from the juvenile to the mature vegetative phase is often revealed by
a. A change in the morphology of the leaves produced
b. The initiation of secondary growth
c. The formation of lateral roots
d. The activation of floral meristem identity genes
Textbook Question
The vascular cambium gives rise to
a. All xylem
b. All phloem
c. Primary xylem and phloem
d. Secondary xylem and phloem
Textbook Question
Root apical meristems are found
a. Only in taproots.
b. Only in lateral roots.
c. Only in adventitious roots.
d. In all roots.
Textbook Question
Suppose a flower had normal expression of genes A and C and expression of gene B in all four whorls. Based on the ABC hypothesis, what would be the structure of that flower, starting at the outermost whorl?
a. Carpel-petal-petal-carpel
b. Petal-petal-stamen-stamen
c. Sepal-carpel-carpel-sepal
d. Sepal-sepal-carpel-carpel
Textbook Question
Which of the following arise(s), directly or indirectly, from meristematic activity?
a. Secondary xylem
b. Leaves
c. Dermal tissue
d. All of the above
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