Correct Option (d)
The passage primarily focuses on the concept and consequences of habitat fragmentation. It describes how this phenomenon, caused by activities such as mining and highway construction, disrupts forest continuity and is deemed the "most serious threat to biodiversity conservation." Therefore, "disruption of habitat" accurately encapsulates the central theme discussed.
Incorrect Options:
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Option (a) Illegal mining in forests: While illegal mining is mentioned in the passage, it is presented as an aggravating factor that intensifies the threat of habitat fragmentation, rather than being the central focus itself. It is a specific cause contributing to the broader problem.
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Option (b) Extinction of wildlife: The passage states that habitat fragmentation affects "several extinction prone species of wild life." Wildlife extinction is depicted as a significant consequence or effect of habitat fragmentation, not the overarching central subject of the entire passage.
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Option (c) Conservation of nature: This option is too broad. While the passage relates to biodiversity conservation, its specific emphasis is on the threat to biodiversity-namely, habitat fragmentation-rather than a general discussion of nature conservation strategies or principles. The passage details a specific problem within the larger context of nature conservation.