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UPSC 2018: Which of the following is/are the possible consequence/s of heavy sand mining in riverbeds? 1. Decreased salinity in the river 2. Pollution of groundwater 3. Lowering of the water-table Select the correct answer using the code given below :
(a)1 only
(b)2 and 3 only
(c)1 and 3 only
(d)1, 2 and 3
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Not attemptedCorrect Answer: (b) 2 and 3 only
Removing large volumes of sand destroys the river-bed’s natural filter, allowing contaminants to percolate and pollute groundwater and deepening the channel, which lowers adjoining water-tables. It generally raises—not lowers—salinity near estuaries, so only statements 2 and 3 are correct. ([edukemy.com](https://edukemy.com/blog/upsc-prelims-2018-question-81/?utm_source=openai))
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Frequently Asked Questions
What is the correct answer to this UPSC 2018 Environment & Ecology question?▼
The correct answer is option (b): 2 and 3 only. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Water & Wetland Conservation question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 2018, GS Paper 1, as Question 81. It falls under Environment & Ecology > Water & Wetland Conservation.
What is the difficulty level of this UPSC question?▼
This question is rated "moderate". It requires sound conceptual understanding of the topic.
How many UPSC Prelims questions have been asked from Water & Wetland Conservation?▼
UPSC has asked 20 questions from Water & Wetland Conservation (under Environment & Ecology) across multiple years. Visit the topic page to see the full list and year-wise trends.