What Do the Results of Research on Gravitropic Responses of Roots

Multiple Choice

What do the results of research on gravitropic responses of roots and stems show?

A) Different tissues have the same response to auxin.
B) The effect of a plant hormone can depend on the tissue.
C) Some responses of plants require no hormones at all.
D) Amyloplasts are required for the gravitropic response.
E) Cytokinin can only function in the presence of auxin.