37. Plant Sensation and Response
Tropisms and Hormones
Problem 4b
Textbook Question
Textbook QuestionWhat evidence suggests that ABA from roots can signal guard cells to close? a. If roots are given sufficient water, guard cells close anyway. b. If roots are dry, guard cells begin to close—even though leaves may not be experiencing water stress. c. Applying ABA on guard cells directly causes them to close. d. If roots are dry, the ABA concentration in leaf cells drops dramatically.
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