Mangroves, coral reefs, seagrass — distribution & threats

UPSC tests factual recall on global/Indian distribution hotspots and specific threat mechanisms (not general conservation). Questions often pair India's Sundarbans mangroves or Andaman coral reefs with threats like aquaculture, coastal development, or bleaching. Common error: confusing ecosystem characteristics with threat types; avoid vague answers like 'pollution' without naming specific stressors.