Final answer:
The assertion that high-voltage wires are wrapped in insulating material is false; they are held by insulators but are not wrapped due to air being a sufficient insulator.
Step-by-step explanation:
The statement regarding high-voltage wires is false. High-voltage wires connected to metal towers are indeed held aloft by insulating connectors, but these wires are not typically wrapped in insulating material. The reason is that at such great heights, the surrounding air provides enough of an insulating medium; also, insulating materials encasing such high-voltage lines would be impractical and vulnerable to environmental hazards over long distances.
Instead, the wires are left bare and rely on the air gap to avoid any leakage of current.
Regarding the human eye, the correct statement is that rods detect shades of gray, not color. Cones, on the other hand, are responsible for color vision. So, the false statement is a.
Rods detect color, while cones detect only shades of gray. When light enters the retina, it does indeed pass ganglion cells and bipolar cells before reaching the photoreceptors such as rods and cones at the rear of the retina. This is because these photoreceptors are positioned at the back layer of the retina tissue.