Discussion
Read the descriptions of various layers of soil given below and identify the horizons for X, Y, Z in the correct sequence :
X : The layer is made of small lumps of rocks with cracks
Y : The layer is soft and porous and retains more water
Z : The compact layer containing a lot of minerals but less humus
Answer: D
The horizons are C-horizon, A-horizon, B-horizon.
- X, small lumps of rock with cracks: the C-horizon, the layer of weathered parent rock just above the bedrock.
- Y, soft, porous and holding more water: the A-horizon or topsoil, rich in humus.
- Z, compact, rich in minerals but with less humus: the B-horizon, the middle layer.
Options listing top-soil or the A-horizon first put the descriptions in the wrong order, since X is clearly the rocky layer.
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