Read the passage excerpt and answer the question:
'Mangrove forests inhabit intertidal coastal zones, functioning as highly efficient carbon sinks through a process known as blue carbon sequestration. Their complex aerial prop-root architecture not only decelerates turbulent wave energy—thereby attenuating shoreline erosion during cyclonic storm surges—but also traps organic sediments in oxygen-depleted marine soils, preventing carbon from oxidizing back into the atmosphere for millennia.'
What dual ecological function do mangrove root systems perform according to the text?
Answer and explanation
Correct answer: C. Attenuating erosive wave energy and trapping organic carbon in anoxic soils
- Step 1: The text highlights that the root architecture 'not only decelerates turbulent wave energy, thereby attenuating shoreline erosion...' but also 'traps organic sediments in oxygen-depleted marine soils'.
- Step 2: These correspond directly to wave dampening and anoxic sediment carbon retention.
Answer
Attenuating erosive wave energy and trapping organic carbon in anoxic soils.
Why not the others: 'Generating fresh potable water...' is factually incorrect as mangroves thrive in saline water; 'Eliminating nitrogenous waste and accelerating tidal currents' contradicts the deceleration of wave energy; 'Promoting inland soil salinization...' distorts their protective barrier function.
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