'Kernel' in the Bible

"Look! I'm giving the order: I will sift the house of Israel throughout all the nations, as one sifts with a sieve, yet not a single kernel will reach the ground!

I tell you the solemn truth, unless a kernel of wheat falls into the ground and dies, it remains by itself alone. But if it dies, it produces much grain.

and what you plant is not the form that it will be, but a bare kernel, whether it is wheat or something else.