Question on: JAMB Biology - 1990

The salinity of a brackish environment is the salt content of the water.

• Brackish water is a mixture of saltwater and freshwater.
• Rain dilutes the water, thus reducing the salinity. Therefore, option A is incorrect.
• Micro-organisms can affect water chemistry, but their direct impact on salinity is less significant than rainfall or evaporation. Therefore, option C is incorrect.
• The dry season leads to evaporation, which would increase the salinity as the water becomes more concentrated with salt. However, the question is looking for the most immediate effect. Therefore, option D is not the best choice.
• After the rainy season, the influx of freshwater slows down and the water becomes more saline compared to during the rainy season. Therefore, option B

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