Domanda del libro di testo
Indicate the response to each condition by drawing a straight seedling or one with the triple response.
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Ch. 39 - Plant Responses to Internal and External Signals
Urry12th EditionCampbell BiologyISBN: 9785794169850
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TOC.tableOfContents
- 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
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Urry 12th EditionCh. 39 - Plant Responses to Internal and External SignalsProblema 7
Urry 12th EditionCh. 39 - Plant Responses to Internal and External SignalsProblema 7Capitolo 39, Problema 7
A plant mutant that shows normal gravitropic bending but does not store starch in its plastids would require a reevaluation of the role of
a. Statoliths
b. Auxin
c. Calcium
d. Differential growth
Guida verificata passo dopo passo1
Understand the concept of gravitropism: Gravitropism is the orientation or growth of a plant in response to gravity. Typically, roots grow downward (positive gravitropism) and shoots grow upward (negative gravitropism).
Identify the role of statoliths: Statoliths are starch-filled plastids that are thought to play a key role in sensing gravity in plant cells. They settle at the bottom of the cell, helping the plant sense the direction of gravity.
Consider the mutant plant's characteristics: The mutant plant shows normal gravitropic bending but does not store starch in its plastids. This suggests that statoliths, which are typically starch-filled, may not be essential for gravitropism in this case.
Evaluate the role of other factors: Since the mutant plant can still perform gravitropic bending without starch storage, other factors like auxin, calcium, or differential growth might be involved in the gravitropic response.
Reassess the role of statoliths: Given the mutant's ability to bend normally without starch, the role of statoliths in gravitropism may need to be reevaluated, indicating that other mechanisms might compensate for the lack of starch storage.
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Gravitropism
Gravitropism is the orientation or growth of a plant in response to gravity. Roots typically exhibit positive gravitropism, growing downward, while shoots show negative gravitropism, growing upward. This process involves the perception of gravity, signal transduction, and differential growth, often mediated by plant hormones like auxin.
Video consigliato:
05:39
Gravitropism
Statoliths
Statoliths are specialized starch-filled organelles found in plant cells, particularly in the root cap, that play a crucial role in gravity perception. They settle under the influence of gravity, helping the plant sense its orientation. The absence of starch in plastids, as in the mutant plant, suggests a need to reassess the role of statoliths in gravitropism.
Video consigliato:
05:39Gravitropism
Auxin
Auxin is a plant hormone that regulates growth and plays a pivotal role in gravitropism by promoting differential growth. It redistributes in response to gravity, causing cells on one side of the plant to elongate more than those on the opposite side, leading to bending. The mutant's normal gravitropic response without starch storage suggests auxin's role might be independent of statoliths.
Video consigliato:
10:46Auxin
Pratica correlata
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If a long-day plant has a critical night length of 9 hours, which 24-hour cycle would prevent flowering?
a. 16 hours light/8 hours dark
b. 14 hours light/10 hours dark
c. 4 hours light/8 hours dark/4 hours light/8 hours dark
d. 8 hours light/8 hours dark/light flash/8 hours dark
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Domanda del libro di testo
How may a plant respond to severe heat stress?
a. By reorienting leaves to increase evaporative cooling
b. By creating air tubes for ventilation
c. By producing heat-shock proteins, which may protect the plant's proteins from denaturing
d. By increasing the proportion of unsaturated fatty acids in cell membranes, reducing their fluidity
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Domanda del libro di testo
The signaling molecule for flowering might be released earlier than usual in a long-day plant exposed to flashes of:
a. Far-red light during the night
b. Red light during the night
c. Red light followed by far-red light during the night.
d. Far-red light during the day
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