Multiple choice

Which among the following statements does not characterise red tides?

  1. The occurrence of red tides may be natural or from human activities.

  2. Coastal water pollution can cause red tides.

  3. Iron-rich dust influx from large desert can cause red tides.

  4. Red tides are related to the movements of the tides.

  5. When the algae are present in high concentrations, the water appears to be discolored.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Red tides are unrelated to movements of the tides. They are not necessarily red and many have no discolouration at all.

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