'Grains' in the Bible

‘Do you not fear Me?’ says the Lord.‘Do you not tremble [in awe] in My presence?For I have placed the sand as a boundary for the sea,An eternal decree and a perpetual barrier beyond which it cannot pass.Though the waves [of the sea] toss and break, yet they cannot prevail [against the sand ordained to hold them back];Though the waves and the billows roar, yet they cannot cross over [the barrier].[Is not such a God to be feared?]

And I said, “What is it?” And he said, “This is the ephah (grain basket) going forth. This,” he continued, “is their appearance throughout the land

One Sabbath He was walking along [with His disciples] through the grainfields, and as they went along, His disciples began picking the heads of grain.

The seed you sow is not the body (the plant) which it is going to become, but it is a bare seed, perhaps of wheat or some other grain.