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Assertion (A): A wide belt of mangrove offers more wave attenuation than a narrow one.
Reason (R): Attenuation accumulates along the path the wave travels through the vegetation.

  • A.A is true but R is false
  • B.A is false but R is true
  • C.Both A and R are true, and R is the correct explanation of A
  • D.Both A and R are true, but R is not the correct explanation of A

Answer: C

Both are true and the reason gives the dependence, and the reduction is roughly exponential with distance. Belt width is therefore the key parameter in nature based defence. A narrow fringe offers comparatively little.

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