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.

Options

A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion.
B. It both Assertion & Reason are true but the reason is not the correct explanation of the assertion.
C. If Assertion is true statement but Reason is false.
D. It both Assertion and Reason are false statements.

Answer

b

Explanation

A cross section of well developed soil shows more or less distinct layers called horione. O- horizon is the topmost layer of soil and A-horizon comes below O horizon. In the topmost layer, vegetation grows and various builogical activities takes place. Tropical rain forests are found in tropical zone of the world and are characterized by very high temeprature and abudances of rainfall. Soil in these area are red latosols and are exccedingly thick. Leaching of minrals from the top soil occurs rapidly but cycling of nutrients also occure here. the laterite soils are generally infertilie because of intesive leaching and not due to growth of micro-organism.