A)there are no dedicated hormone-producing organs in plants as there are in animals.
B)all production of hormones is local in plants with little long-distance transport.
C)only animal hormone concentrations are developmentally regulated.
D)only animal hormones may have either external or internal receptors.

A)only shoots depend upon auxin distribution.
B)only shoots depend upon the aggregation of statoliths.
C)only roots exhibit rapid elongation of specific cells.
D)only roots sense gravity at the tips.
E)the threshold and response time is much less in shoots than in roots.

A)abscisic acid
B)ethylene
C)cytokinin
D)gibberellin
E)auxin