¿Son "el pan" y "la fruta" seimpre singular?
The flash cards in Learning Spanish One for plural and singular do not show a plural for them.
3 Answers
No, las frutas and los panes are quite common when there is more than one kind of fruit or bread.
Las frutas

Los panes

Los panes y los peces

No they are "los panes" and "las frutas"
Great question!
"Las frutas" is not unusual to hear, in the sense of of something along the line of "Muchas frutas son una fuente de vitaminas". However, the singular is more common, just as it is in English.
"Los panes" would be more unusual. Instead of hearing something like "Muchos panes" you would hear "Muchas variedades de pan".
However, there are so many different regions of the Spanish speaking world, that it would certainly be possible.