A good thing to examine with science, the scripture speaks of two types of seed, and both are derived from scripture.
The character of the interpretation is the seed idea, the application becomes the plant that eventually bears fruit.
In the same way people could ask, why does my soul hunger? why does my soul thirst? why am I depressed, neurotic, bloodthirsty, or starved to annihilate everything? The answer is all in the seed, and the soil it is planted in.
So many people in the church fall prey to these hungers and thirsts that are sinful, death bound, and demonic. However, this should not be so.
Thus according to science, what is the genetics of a good seed that feeds everyone to satisfaction? What are it's characteristics? If we had such a seed, perhaps a parable could be more commonly known for emotional and spiritual hungers alike.
All of theses desired and search is to fill a void that can only be filled by God. This is true irrespective of the seed.