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Consider the following statements about an estuary: 1. An estuary is the place where the river freshwater meets with ocean water. 2. This area is highly productive. 3. This area is highly unproductive. Which of the above statements is/are true?

Consider the following statements about an estuary: 1. An estuary is the place where the river freshwater meets with ocean water. 2. This area is highly productive. 3. This area is highly unproductive. Which of the above statements is/are true? Correct Answer 1 and 2 only

The correct answer is 1 and 2 only.

 Key Points

  • An estuary is a place where a river or a stream opens into the sea (mouth of the river). Hence Statement 1 is true.
  • It is a partially enclosed coastal area of brackish water (salinity varies between 0-35 ppt) with one or more rivers or streams flowing into it, and with a free connection to the open sea.
  • At the estuaries, freshwater carrying fertile silt and runoff from the land mixes with the salty seawater.
  • Estuaries form a transition zone (ecotone) between river environments and maritime environments and are highly productive. Hence Statement 2 is true.
  • Examples of estuaries are river mouths, coastal bays, tidal marshes, lagoons, and deltas.

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