Question: how are amyloplasts related to gravitropism?
Answer: Amyloplasts are thought to play a vital role in gravitropism. Statoliths, a specialized starch-accumulating amyloplast, are denser than cytoplasm, and are able to settle to the bottom of the gravity-sensing cell, called a statocyte. ... In stems, gravity is sensed in the endodermal cells of the shoots.