Campbell Biology (11th Edition)
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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Chapter 39.1, Problem 1CC

What are the morphological differences between dark-and light-grown plants? Explain how etiolation helps a seedling compete successfully.

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What are the morphological differences between darkand light-grown plants? Explain how etiolation helps aseedling compete successfully.
In a common eudicot pattern of development for the common bean in the figure, the radicle emerges from the seed (1), then begins to develop into a primary root that grows down into the soil. As this occurs, the hypocotyl emerges from the seed and bends into the shape of a hook (2). The bent hypocotyl lengthens and pulls the cotyledons upward (3). When the hypocotyl reaches the soil surface, exposure to light causes it to straighten (4). Primary leaves emerge from between the cotyledons and begin photosynthesis. The cotyledons typically undergo a period of photosynthesis before shriveling (5). Eventually, the cotyledons fall off the lengthening stem, and the young plant’s new leaves produce all of its food.  a) Identify and explain what environmental factors influence the timing and coordination of the germination of seeds.
What are three functions of the shoot apical meristem?

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Campbell Biology (11th Edition)

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