Tropism is the growth response of a plant caused by a stimulus.gravitropism is the growth response of a plant to gravity.the roots grow downward towards gravity.which is called positive gravitropism.the stem and upper part of a plant grow upward,away from gravity,which is called negative gravitropism
C. Lantus. All other answers are pills . A and B are thyroid pills and C is also for diabetes but is a pill form
