No, sugar cane is a member of the grass family and has parallel leaf veins.
Almost all except a few.
Venation is how a the leaf veins are organized. Netted venation is when there are larger veins with many smaller veins branches making a type of web pattern.
I think the watermelon is a dicot, so the leaf venation will be reticulated, or netted.
Netted
A carnation is a dicot. It's flower parts are in groups of four and its leaves have netted venation.
No, it does not have parallel venation. It's venation is pinnately netted venation
netted
pinately netted
netted
pinately netted
It is reticulate type.
Alternate phyllotaxy