Campbell Biology
12th Edition
ISBN: 9780135188743
Author: Urry
Publisher: PEARSON
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Textbook Question
Chapter 39, Problem 5TYU
Level 2: Application/Analysis
5. 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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A tobacco plant has successfully fended off plant pathogen via hypersensitive response (HR).
(i)
What would you be able to observe on the plant and explain the processes that happened
at cellular level?
What are the benefits for the tobacco plant that has developed systemic acquired
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1.
A) Describe the three steps (Reception, Transduction, Response) of de-etiolation (greening response) signal transduction in plants.
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Hormones and signal pathways
Complete the following paragraph to describe signal transduction as it occurs within plants. Choices may be used more than once or
not at all.
Chemical signals called
play an important role in a plant's
ability to respond to a stimulus.
These signals bind to receptors, the first step in a cellular response called a
may be located in the plasma membrane, the cytoplasm, the
nucleus, or the endoplasmic reticulum.
The series of relay proteins or enzymes activated by the hormone binding the
receptor make up the
Some responses are immediate,
while others require a
like Ca*, to initiate a cellular
response.
The result of the transduction pathway is a
which is often
the transcription of specific genes, resulting in some measurable change.
hormones
reflex arc
signal transduction
pathway
Signal transducers
second messenger
response
Receptor proteins
first messenger
Chapter 39 Solutions
Campbell Biology
Ch. 39.1 - Prob. 1CCCh. 39.1 - Cycloheximide is a drug that inhibits protein...Ch. 39.1 - Prob. 3CCCh. 39.2 - Prob. 1CCCh. 39.2 - WHAT IF? If a plant has the double mutation err...Ch. 39.2 - MAKE CONNECTIONS What type of feedback process is...Ch. 39.3 - If an enzyme in field-grown soybean leaves is most...Ch. 39.3 - WHAT IF? If a plant flowers in a controlled...Ch. 39.3 - Prob. 3CCCh. 39.4 - Prob. 1CC
Ch. 39.4 - Prob. 2CCCh. 39.4 - Prob. 3CCCh. 39.5 - Prob. 1CCCh. 39.5 - Chewing insects mechanically damage plants and...Ch. 39.5 - Many fungal pathogens get food by causing plant...Ch. 39.5 - Prob. 4CCCh. 39 - What are two common ways by which signal...Ch. 39 - Is there any truth to the old adage, "One bad...Ch. 39 - Why did plant physiologists propose the existence...Ch. 39 - Plants that have acclimated to drought stress are...Ch. 39 - Prob. 39.5CRCh. 39 - Prob. 1TYUCh. 39 - Prob. 2TYUCh. 39 - Prob. 3TYUCh. 39 - How may a plant respond to severe heat stress? (A)...Ch. 39 - Level 2: Application/Analysis 5. The signaling...Ch. 39 - If a long-day plant has a critical night length of...Ch. 39 - Prob. 7TYUCh. 39 - DRAW IT Indicate the response to each condition by...Ch. 39 - Level 3: Synthesis/Evaluation 9. EVOLUTION...Ch. 39 - SCIENTIFIC INQUIRY A plant biologist observed a...Ch. 39 - SCIENCE. TECHNOLOGY, AND SOCIETY Describe how our...Ch. 39 - Prob. 12TYUCh. 39 - Prob. 13TYU
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- 2. Plant cells communicate in a variety of ways to elicit cellular responses. In the figure below the plant is responding the presence of light with the release of auxin. Auxin was first discovered for its ability to promote growth in plants. It is a plant hormone that inhibits the lengthening and stimulate the formation of lateral roots and root hairs. (a) Describe the plant's response to the presence of light. (b) Explain the role that auxin has in eliciting the plant's response. (c) Explain how the behavioral responses of the plant affect their overall fitness.arrow_forwardPlant cells communicate in a variety of ways to elicit cellular responses. In the figure below the plant is responding the presence of light with the release of auxin. Auxin was first discovered for its ability to promote growth in plants. It is a plant hormone that inhibits the lengthening and stimulate the formation of lateral roots and root hairs. a) Describe the plant’s response to the presence of light. (refer to picture)arrow_forwardPhenolics, spines, terpenes, cutins, defense related proteins and suberin are some examples of plant defense. Plants are evolving to put up a fight against plant pathogen invasion. (i) Classify them into TWO (2) main classes of plant defense. (ii) What are the roles of terpenes in plant defense?arrow_forward
- Will a long-day plant (LDP) bear flowers after it was subjected to nights interrupted by flashing red light followed by far-red light? *arrow_forward1. Plant Hormone signal transduction is an exciting field and the mode of signaling for various hormones in the cellular context have been elucidated. Compare and contrast the plant hormone Auxin and ethylene signal transductions mechanisms. (Hint. Begin at the Receptor level)arrow_forwardWhat are the effects brought by cytokinin in plants? Explain the partnerships between cytokinin with auxin and hormone mentioned in Question 3 a). (i) (ii) Write an account on interactions between gibberellins, indole acetic acid and abscisic acid in plant growth promotion and seed germination.arrow_forward
- Will a long-day plant (LDP) bear flowers after it was subjected to nights interrupted by flashing red light?arrow_forwardDiscuss how the property of plant cell totipotency has been utilised for plant propagation and improvement?(please refer to XII NCERT)arrow_forwardPlant cells communicate in a variety of ways to elicit cellular responses. In the figure below the plant is responding the presence of light with the release of auxin. Auxin was first discovered for its ability to promote growth in plants. It is a plant hormone that inhibits the lengthening and stimulate the formation of lateral roots and root hairs. (b) Explain the role that auxin has in eliciting the plant’s response.arrow_forward
- Plant cells communicate in a variety of ways to elicit cellular responses. In the figure below the plant is responding the presence of light with the release of auxin. Auxin was first discovered for its ability to promote growth in plants. It is a plant hormone that inhibits the lengthening and stimulate the formation of lateral roots and root hairs. (c) Explain how the behavioral responses of the plant affect their overall fitness. ( refer to picture )arrow_forwardPhytochrome is a plant pigment protein that mediates plant infection promotes plant growth mediates morphological changes in response to red and far-red light inhibits plant growtharrow_forwardPlease help this is hw and I want to know why I'm wrong Why do many plants use pathways that detect light to regulate their flowering? Selected Answer: This allows plants to link flowering to temperature, which corresponds to the season when conditions are optimal Answers: This allows plants to link flowering to day length, which corresponds to the season when conditions are optimal Flower petals carry out high levels of photosynthesis and require high light conditions This allows plants to link flowering to temperature, which corresponds to the season when conditions are optimal A minimum amount of light is always necessary for floweringarrow_forward
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