any relation between planar graphs and connected or disconnected graph

Question

I just wanted to confirm that if I have a disconnected graph ,then I can call it planar .so for a graph to be planar do I need to check whether it is connected or disconnected.

Answer 1

planar graph need not to be connected .... this should follow only condition is no edge must cross each other
they will specify for connected planar graph in question.

Answer 2

First of all there is no relation between concept of planarity & concept of connected & disconnected graph.

Given disconnected graph, you can not call it either planar or non planar.

As

K3,3, & K5 can be components of disconnected graph  & disconnect graph is non planar here !

Usually they will give you whether given planar graph is connected or disconnected !