How does a polyp primarily use its tentacles?

Clarify the primary function of tentacles: The tentacles are primarily used to capture food particles from the surrounding water. They trap and immobilize prey, which is then transported to the polyp's mouth for digestion.

Eliminate incorrect options: Tentacles are not used for photosynthesis, as polyps do not have chloroplasts or the ability to photosynthesize. They also do not excrete waste products or move rapidly across the ocean floor, as polyps are sessile organisms.