In the previous shloka, Krishna listed the eight elements of His material nature. Now He reveals something deeper. Beyond all that, He says, I have another nature — a higher one. It is the life force itself, present as consciousness in every living being. And it is this higher nature that holds the entire world together.
Think of a house. The walls, the roof, the bricks — all of that is visible. But the foundation that holds it all up is hidden beneath the ground. The material world looks solid and self-sufficient, but it is the conscious life force — the para prakriti — that actually sustains it.
'Yayedam dharyate jagat' — by which this world is sustained. Without this conscious power, the inert elements would have no coherence. Matter alone cannot stand. It needs the spark of awareness to hold everything in place.