Official Answer Key & Detailed Solution
Ready to check the official UPSC Answer Key?
Click any option above to test yourself under exam conditions, or reveal the explanation directly.
Correct Answer: Option (A) — Red tides
Concept & Option Breakdown
Standard Reference VerifiedExcessive algal blooms of pigmented dinoflagellates give the coastal/estuarine waters a reddish or brownish tint, commonly known as 'red tides'.
Practice Full-Length & Sectional Prelims Mocks on this Interface
50 simulated tests in the APT Prelims Test Series (₹1,493) or 1-on-1 Mentorship with Avinash Sir.