Consider the following statements :Statement-I :The soil in tropical rain forests is rich in nutrients.Statement-II :The high temperature and moisture of tropical rain forests cause dead organic matter in the soil to decompose quickly.Which one of the following is correct in respect of the above statements?

1. A

   Both Statement-I and Statement-II are correct and Statement- II is the correct explanation for Statement-I

   Both correct and II explains I. Rainforest soils are typically nutrient-poor; nutrients sit in biomass.

2. B

   Both Statement-I and Statement-II are correct and Statement- II is not the correct explanation for Statement-I

   Both correct but II does not explain I. I is false.

3. C

   Statement-I is correct but Statement- II is incorrect

   I correct, II incorrect. Fast decomposition is real.

4. D

   Statement-I is incorrect but Statement-II is correct

   I incorrect, II correct. Heat and moisture decompose litter quickly; the soil itself is leached and poor.

Summary. Official key is (d). Tropical rainforest soils are usually infertile (oxisols/ultisols) because nutrients are locked in living matter and heavy rain leaches the rest. High heat and moisture do speed decomposition — Statement-II is true and does not make I true.