Match List-I with List-II

List-I (Soil parameters)	List-II (Measurement)
[A] Bulk density	(I) Cl³⁶
[B] Soil water content	(II) C¹³
[C] Seepage	(III) H²
[D] Soil salinity	(IV) Am–Be
[E] Soil aggregation	(V) Cs¹³⁷

Choose the correct answer from the options given below:

Correct option is A

✅ Correct matching: Option (a)
[A]-(V), [B]-(IV), [C]-(III), [D]-(I), [E]-(II)
Explanation of correct pairs:
· Bulk density → Cs¹³⁷ (V)
· Cesium-137 is used as a tracer to study soil redistribution, compaction, and bulk density changes.
· Soil water content → Am–Be (IV)
· Americium–Beryllium is a neutron source.
· Neutron scattering techniques measure hydrogen atoms, hence soil moisture.
· Seepage → H² (III)
· Deuterium (²H) is used as a tracer in water movement studies.
· Helps track seepage and flow paths.
· Soil salinity → Cl³⁶ (I)
· Chlorine-36 is a radioactive tracer for salt movement and salinity studies in soil and groundwater.
· Soil aggregation → C¹³ (II)
· Carbon-13 is used to study soil organic matter dynamics.
· Organic carbon plays a major role in soil aggregation.
➡️ Hence, option (a) exactly matches all soil parameters with their correct measurement techniques.
❌ Why other options are incorrect
Option (b):
· Soil water content is wrongly matched with Cs¹³⁷.
· Cs¹³⁷ is related to bulk density, not moisture.
Option (c):
· Bulk density is incorrectly linked with H².
· Soil salinity is wrongly associated with C¹³.
Option (d):
· Soil water content is incorrectly paired with H².
· Soil aggregation is wrongly linked with Cl³⁶.
�� Key Points to Remember
· Am–Be → soil moisture (neutron probe)
· Cs¹³⁷ → bulk density & soil redistribution
· H² (Deuterium) → seepage and water movement
· Cl³⁶ → soil salinity studies
· C¹³ → soil organic matter & aggregation