That depends completely on the slope that you're trying to compensate for.
Figure for two inches at the high point, but settle for one.
Cabbages grow above ground
No, they are under water but not under ground. There is no ground above them.
sunflowers grow above ground .
No
They grow above the ground. On a tree. Have a look at Wikipedia.
It should be placed under the clips.
It depends if you under ground Or above ground because you can follow Where you dug if your above ground you can't
Below ground.
No roots are not located under the ground
carrots
no
no you can only use the bike above ground