Multiple choice

Red Tide is a common name for a phenomenon known as an algal bloom, an event in which estuarine, marine or fresh water algae accumulate rapidly. Which among the following statements does not characterise red tides?

  1. When the algae are present in high concentrations, the water appears to be discoloured.

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

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

  4. Coastal water pollution can cause red tides.

  5. The occurrence of red tides may be natural or from human activities.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

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

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