"Sunflowers got their name not only because their blossoms are round and yellow but also because the plants are heliotropic."

Question

What does the word "heliotropic" mean in this context? Use these dictionary entries to answer the question:

helio- (prefix) related to the sun or sunlight

-tropos (suffix) turning


plants that are warm to the touch


plants that give off light


plants that swivel to face the sun


plants that thrive in full sun

Answer 1

In this context, the word "heliotropic" means plants that swivel to face the sun.