GyanGramEnvironment · Prelims 2014 Q484
Other than poaching, what are the possible reasons for the decline in the population of Ganges River Dolphins? 1. Construction of dams and barrages on rivers 2. Increase in the po…
Stem and options.
Other than poaching, what are the possible reasons for the decline in the population of Ganges River Dolphins?
1. Construction of dams and barrages on rivers
2. Increase in the population of crocodiles in rivers
3. Getting trapped in fishing nets accidentally
4. Use of synthetic fertilizers and other agricultural chemicals in crop-fields in the vicinity of rivers
Select the correct answer using the code given below.
Source: UPSC Civil Services Preliminary Examination 2014. Syllabus tags and explanation are GyanGram editorial joins for learning—not official UPSC metadata.
Correct option C
• Correct Answer: C
• Dams and barrages fragment habitat and isolate dolphin populations; accidental bycatch in nylon gillnets is a leading cause of mortality; agricultural chemicals cause eutrophication and bioaccumulation.
• 2 is wrong: There is no evidence that crocodile population increase threatens Ganges River Dolphins.
Where this sits in Learn.
Unit
Biodiversity
ENV-U03Chapter
Threatened Species
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