Correct Option (D)
Neither 1 nor 2
Incorrect Options:
- Statement 1: Desertification is a phenomenon in tropical areas only.
The passage explicitly states, "While this phenomenon is often linked of the arid, semi-arid and sub-humid ecosystems, even in the humid tropics, the impact could be most dramatic." This indicates that desertification is not exclusively a tropical phenomenon, as its effects are observed across various climatic zones, including arid, semi-arid, sub-humid, and even humid tropical regions. - Statement 2: Deforestation invariably leads to floods and desertification.
The passage identifies deforestation as a major contributor to "adverse alterations in the hydrology and related soil and nutrient losses," and states that its consequences "invariably arise out of site degradation through erosive losses." While these processes are significant factors contributing to desertification, the passage does not assert that deforestation *invariably* leads to the *total loss of productivity* that defines desertification. Furthermore, regarding floods, the passage describes "frequent inundation along the flood-plains of Brahmaputra" as an *indirect consequence* of deforestation, mediated through "drastic alteration in the upland-lowland interaction" and subsequent siltation and changing river courses. The term "invariably" implies an absolute and unavoidable outcome, which is not supported by the passage's description of these complex environmental interactions.