Answer:
You eat something you neither plant nor plow. It is the son of water, but if water touches it, it dies.
They made me a mouth, but didn't give me breath. Water gives me life, but the sun brings me death.
There are several different kinds, but the one you pick doesn't do its job. What is it?
Large as a mountain, small as a pea, Endlessly swimming in a water-less sea.
Gets rid of bad ones, short and tall. Tightens when used, one size fits all.
hide me from your parents if you have done bad academically this year.