Only the main panel is grounded directly because if you ground each junction box of subpanel ground loop current paths are possible that can cause shock hazards. The ground rod is connected to main panel and the neutral is bonded to that ground as is the ground wire. The neutral and ground wire are then run to all circuits, junction boxes and subpanels throughout the house.
If you tie neutral and ground together at any point in the house, other than the main panel ground loops can exist and cause shocks.
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Can lights have a junction box attached to them. So yes.
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A 240 volt wire is the insulation factor of the wire. If you mean a 240 supply source from a distribution panel to a junction box then the answer is yes. You have to keep in mind that the box has to be accessible, meaning that you can get to the box to check the splice within the box. Don't bury the junction box behind the wall board.
The green ground wire should be attached directly to the junction box. That is the metal housing where the house wires enter the outlet.
The pre wire for a ceiling fan light should be made with a three wire cable. This cable will have a red, black, and white wire as main conductors. This cable will also have a bare ground wire. This wire should be strung between a two gang switch box to the fixture junction box. This pre wire allows the supply to be either fed to the two gang box. From the two gang switch junction box, one side will be used for the light in the fixture and the other side of the switch junction box, itwill be used for the fan portionin the fixture.