Question

into which horizon roots cannot penetrate​

Answer 1

Answer:

after subsoil the layer is called C-horizon,consists of rocks one fragments of it.so root find it difficult to pass through this rocky layer so the roots cannot penetrate after C-horizon

Answer 2

Answer:

The roots cannot penetrate through the C horizon because the C horizon has fragments of unweathered rocks that's why roots find it difficult to penetrate between the fragments and also C horizon lacks humus and is infertile