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Environmental Issues — BIOLOGY STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceBIOLOGYEnvironmental Issues1 Mark
MCQ
Which method is most effective in controlling floods?
  • A
    Digging deep canals
  • ✓
    Reforestation
  • C
    Deforestation
  • D
    Constructing dams
✓

Answer

Correct option: B.
Reforestation
Loss of vegetation $($deforestation$)$ results in an increased risk of flooding. With natural forest cover, the flood duration should decrease. Reducing the rate of deforestation should improve the incidents and severity of floods.
Reforestation and afforestation are two strategies to increase the vegetation cover, that can improve infiltration and interception rates, and thus regulate flood peaks. Reforestation refers to planting trees in areas, where they have been cut down, while afforestation means planting trees, where they have never existed.
Dams and reservoirs are effective in controlling floods by reducing peak flows.

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