Campbell Biology (11th Edition)
11th Edition
ISBN: 9780134093413
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece
Publisher: PEARSON
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Textbook Question
Chapter 39.3, Problem 2CC
WHAT IF? Ø If a plant flowers in a controlled chamber with a daily cycle of 10 hours of light and 14 hours of darkness, is it a short-day plant? Explain.
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Phytochrome, plays an important role in flowering in many plants. It can also be used to determine when lettuce seeds germinate (shown in the figure below
Which scenario(s) above produce large amounts of the active form of phytochrome?
A
B
A & C
B & D
Predict whether flowering in a short day plant with a minimum critical length of 14 hours would be expected to occur in the following situations.
The plant is exposed to 15 hours of daylight and 9 hours of darkness uninterrupted.
The plant is exposed to 9 hours of daylight and 15 hours of darkness.
The plant is exposed to 9 hours of daylight and 15 hours of darkness, with 10 minutes exposure to red light in the middle of the night.
What is the conclusion?
Chapter 39 Solutions
Campbell Biology (11th Edition)
Ch. 39.1 - What are the morphological differences between...Ch. 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 - MAKE CONNECTIONS Plants detect the quality of...Ch. 39.4 - Prob. 1CC
Ch. 39.4 - Prob. 2CCCh. 39.4 - Prob. 3CCCh. 39.5 - What are some drawbacks of spraying fields with...Ch. 39.5 - Chewing insects mechanically damage plants and...Ch. 39.5 - Many fungal pathogens get food by causing plant...Ch. 39.5 - WHAT IF? Suppose a scientist finds that a...Ch. 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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- A short-day plant flowers only when exposed to light for less than 12 hours long. Which of the following would cause the plant to flower? * O a 13-hour night and 11-hour day with 1 minute of darkness after 6 hours a 12-hour day and 12-hour night with a flash of red light an 8-hour day and 16-hour night with a flash of white light after 8 hours O a 9-hour night and 15-hour day with 1 minute of darkness after 7 hours 24 hours of continuous lightarrow_forwardUsing the provided figure, describe the importance of the two phytochrome systems in controlling de-etiolation and green stem elongation under full sun and shade. Include the key mechanisms and temporal changes in control of this process.arrow_forwardPlant Physiology In the amazon rainforest, what is needed (1 only) to induce germination faster? Why?arrow_forward
- Please answer question 2arrow_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_forwardWould a red:FR light value of 0.14 1:7 be expected of a plant in shaded light beneath a leaf canopy and if we assume that ratio would we expect that our pfr per total phytochromes would be more than that in direct sunlight?arrow_forward
- A long-day plant will flower if Select one: O the duration of continuous light is less than a critical length. O the duration of continuous light exceeds a critical length. O the duration of continuous darkness is less than a critical length O it is kept in continuous far-red light. O the duration of continuous darkness exceeds a critical length.arrow_forwardWhat preliminary conclusions can you draw from the results of the experiment and what is the independent and dependent variable ?arrow_forwardwhat is the average growths of each of these plants?arrow_forward
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