Multiple Choice
What is growth that results in curvatures of whole plant organs toward or away from stimuli called?
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37. Plant Sensation and Response
Tropisms and Hormones
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A callus will develop roots if you use a __________ auxin concentration and a __________ cytokinin concentration in the medium.
A
high; high
B
low; high
C
low; low
D
low; high or low
E
high; low
Verified step by step guidance1
Understand the role of auxins and cytokinins in plant tissue culture. Auxins are plant hormones that promote root formation, while cytokinins promote shoot formation.
Recognize that a callus is an undifferentiated plant tissue that can be induced to form roots or shoots depending on the hormone concentrations in the medium.
To promote root development from a callus, a high concentration of auxin is typically required because auxins stimulate root initiation.
Cytokinins, on the other hand, should be kept at a low concentration to avoid promoting shoot formation, which would counteract root development.
Therefore, the correct combination for root development in a callus is a high auxin concentration and a low cytokinin concentration.
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