Campbell Biology (11th Edition)

Published by Pearson
ISBN 10: 0-13409-341-0
ISBN 13: 978-0-13409-341-3

Chapter 36 - 36.4 - Concept Check - Page 796: 1


The opening and closing of stomata are controlled by the following: 1) light (opening makes sense when dawn comes and carbon dioxide is needed for photosynthesis); 2) carbon dioxide depletion (again, opening makes sense to let carbon dioxide into the leaf for photosynthesis); 3) circadian rhythms, which help anticipate the time when carbon dioxide is needed for photosynthesis; and 4) environmental stresses, which raise levels of the hormone, abscisic acid, when water is scarce, closing stomates to conserve water.

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