As a Seed Germinates,its Shoot Points Upward Toward Light,and Its

Multiple Choice

As a seed germinates,its shoot points upward toward light,and its roots grows downward into the soil.Turn the plant sideways,and the stem and roots bend according to the new direction of gravity.How do roots respond to gravity?

A) through thigmotropism
B) through circadian rhythms
C) by the absorption of light by phytochromes
D) by the movement of statoliths within the cell
E) by sensing the photoperiod