Reddit, Nambo, CyanCat and many other seeds include melons in their terrain generation, just look carefully.
Yes you can grow cactus in mine craft Pocket edition ,cuz I have a cactus farm
No.
yes
You dig .
cant you ...............
no
With an iron pickaxe
Tap it
you tap on it
No
theederscrolls
find it and mine it with iron pickaxe or better