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13.Biodiversity and Conservation
normal
Assertion : In tropical rain forests. $O-$ horizon and $A-$ Horizon of soil profile are shallow and nutrient-poor.
Reason : Excessive growth of micro-organisms in the soil depletes its organic content
A
If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
B
If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
C
If the Assertion is correct but Reason is incorrect.
D
If both the Assertion and Reason are incorrect.
(AIIMS-2006)
Solution
$O-$ horizon occupies the topmost soil and is rich in mineral and decomposed organic matter (humus). $A-$ horizon is dark coloured and has abundant minerals mixed with humus
Standard 12
Biology
