Biology (MindTap Course List)
11th Edition
ISBN: 9781337392938
Author: Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg
Publisher: Cengage Learning
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Chapter 38, Problem 15TYU
Summary Introduction
To explain: The reason why a plant with a mutation in one of its phytochrome genes that affects the flowering time would be at an evolutionary disadvantage.
Introduction: Photoreceptor refers to the light-sensitive proteins that are involved in sensing and response to light in many organisms. The three main classes of photoreceptors are phytochrome, cryptochrome, and phototropin.
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The rapid turgor movements of the sensitive plant (Mimosa pudica) are rare in the Plant Kingdom. If all plants evolved such movements, would the phenomenon have possible survival value or other value to the plants? Explain.
Using 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.
Tobacco plants invest a lot of resources into the production of secondary compounds
know as alkaloids (e.g., nicotine) that we believe act as defenses against herbivores.
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might you conclude/hypothesize/investigate based on the data in graph (b)
(a)
Chemical defenses
(percent of leaf mass)
1.8%
1.4
1.0
0.6
0.2
No hormone added
Hormone added
(b)
Lifetime seed mass
(g/plant)
-18
14
10
No hormone added Hormone added
It would be good to test whether the hormone is very specific or whether it might also
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The hormone has no effect on the lifetime…
Chapter 38 Solutions
Biology (MindTap Course List)
Ch. 38.1 - Prob. 1LOCh. 38.1 - Prob. 1CCh. 38.1 - Prob. 2CCh. 38.2 - Prob. 2LOCh. 38.2 - Prob. 3LOCh. 38.2 - Prob. 4LOCh. 38.2 - Prob. 1CCh. 38.2 - Prob. 2CCh. 38.2 - Which hormones are involved in each of the...Ch. 38.3 - Explain how varying amounts of light and darkness...
Ch. 38.3 - Prob. 6LOCh. 38.3 - Prob. 7LOCh. 38.3 - Prob. 8LOCh. 38.3 - Prob. 1CCh. 38.3 - Prob. 2CCh. 38.3 - Prob. 3CCh. 38.4 - Prob. 9LOCh. 38.4 - Prob. 1CCh. 38 - Prob. 1TYUCh. 38 - Prob. 2TYUCh. 38 - Prob. 3TYUCh. 38 - Prob. 4TYUCh. 38 - The stress hormone that helps plants respond to...Ch. 38 - Prob. 6TYUCh. 38 - Prob. 7TYUCh. 38 - Pfr, the active state of _______________, forms...Ch. 38 - Prob. 9TYUCh. 38 - Which signaling molecule triggers the release of...Ch. 38 - Prob. 11TYUCh. 38 - PREDICT State whether flowering in a short-day...Ch. 38 - PREDICT If you transplanted the short-day plant...Ch. 38 - EVOLUTION LINK What adaptive advantages are...Ch. 38 - Prob. 15TYUCh. 38 - Prob. 16TYUCh. 38 - Prob. 17TYU
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