Soils of which soil order have no diagnostic horizon

✅ Explanation:
Entisols are the youngest soils in the soil classification system. They lack well-developed horizons due to their recent formation or factors that inhibit soil development, such as erosion or deposition. The absence of distinct horizons means they don't have any diagnostic horizons, which are specific soil layers used to classify soils into different orders.

📌 Other Options Explanations:
-Option A: Mollisols: Mollisols are characterized by a thick, dark surface horizon rich in organic matter, known as the mollic epipedon.
-Option C: Andisols: Andisols are formed from volcanic ash and have unique properties like high water-holding capacity and fertility. They possess diagnostic horizons such as andic or melanic horizons,.
-Option D: Aridisols: Aridisols are dry soils found in arid regions. While they may have weakly developed horizons due to limited moisture, they often have diagnostic horizons like calcic or gypsic horizons,