Arrange soil horizons from top to bottom in the soil profile:
(A) Oi (B) E (C) Oe (D) EB (E) BC
Choose the correct answer from the options given below:

Correct option is C

Soil horizons are layers in the soil profile, arranged vertically based on their composition, structure, and formation processes. The correct sequence from top to bottom in the profile is:
1. Oi (A):
· The organic horizon at the top, primarily composed of undecomposed organic material.
2. Oe (C):
· The second organic horizon, containing partially decomposed organic matter.
3. E (B):
· The eluviation horizon, characterized by the leaching of minerals and organic matter, leaving a lighter-colored layer.
4. EB (D):
· A transitional horizon between the E and B horizons, showing characteristics of both.
5. BC (E):
· A transitional layer between the B horizon (subsoil) and the C horizon (parent material).
Thus, the correct order is (A), (C), (B), (D), (E).
Information Booster: 1. Soil Horizon Overview:
· O Horizon: Organic matter at the surface, subdivided into Oi (undecomposed) and Oe (partially decomposed).
· E Horizon: Zone of eluviation, where minerals and organic materials leach out.
· B Horizon: Zone of accumulation of minerals (illuviation).
· C Horizon: Composed of partially weathered parent material.
2. Purpose of Understanding Soil Horizons:
· Soil classification.
· Evaluating soil fertility and suitability for agriculture.
· Understanding environmental and geological processes.
Additional Knowledge: Oi (A):
· Surface layer of mostly fresh, undecomposed organic material like leaves and twigs.
Oe (C):
· Layer containing humus or partially decomposed organic material.
E (B):
· Eluviation layer where fine particles, minerals, and organic matter are removed, leaving a light-colored horizon.
EB (D):
· A mixed horizon showing properties of both the E and B horizons.
BC (E):
· Transitional layer between the B horizon and the unweathered parent material of the C horizon.