Discussion
Read the following statements :
Situation A : Growth and branching of roots in the A-horizon and B-horizon is advantageous for absorption of water and minerals.
Situation B : C-horizon is rich in humus which makes soil soft and porous.
Choose the correct option.
Answer: A
Only Situation A is true.
The A-horizon (topsoil) and B-horizon (subsoil) hold the water, minerals and humus that roots use, so roots that grow and branch there absorb water and minerals well. Situation A is correct.
Situation B is false. The humus that makes soil soft and porous is in the topsoil, the A-horizon. The C-horizon is made of weathered and broken pieces of the parent rock, with little or no humus. So the options calling B true are wrong.
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