17. NCERT Exemplar VIII

Situation A & BSituation BSituation A is advantageous to plants because A and B horizons are humus-rich regions. Humus improves the soil's texture, increases the soil's plant-holdingsoil-holdingwater-holding capacity, and provides nutrients for plant growth. Minerals are also present in A and B horizons. Humus and minerals make the soil fertile and help plants grow. So, the growth and branching of roots in the A and BA and CB and C horizons are advantageous for plants' absorption of water and minerals.