Well,
One could add many different prefixes to tropism to get various results.
Photos + tropos = Phototropism = Turning toward the light.
Gravi + tropos = Gravitropism = Turning toward gravity, a.k.a. turning downwards. Plant stems exhibit negative gravitropism, as they grow upwards, against gravity. I would call it "graviphobia."
Hydro + tropos = Hydrotropism = Turning toward water. This is exhibited by plants' roots growing toward water.
Those are the ones that you can look up in a dictionary and find as legit words. These are ones I have just made up, but still make sense (to some degree).
Helio + tropos = Heliotropism = Turning toward the sun. Synonymous with phototropism.
Claudo + tropos = Claustropism = Turning toward enclosed spaces. Sounds silly, but that's what you do to go into an elevator. Synonymous with claustrophilia.
Caput + tropos = Caputropism = Turning toward the head. That's what everyone does when they face the leader of their group.
Astra/stella + tropos = Astrotropism/Stellatropism = Turning toward the star. Basically stargazing.
Heterotrophs are not able to produce their own food. Alternatively, they acquire from organic substances for energy and food. Heterotrophs cannot obtain organic substances from inorganic molecules. Therefore, no, an organism without the traits mentioned does not qualify to be classified as a heterotroph.
Smooth muscle is responsible for the contractility of hollow organs such as blood vessels, the gastrointestinal tract, the bladder, or the uterus.