Moderate
In low-rainfall areas, huge shifting sand dunes are commonly found, particularly near human habitations. Techniques of afforesting the shifting dunes needed to be implemented. These techniques consist of___________?
Correct answer: C. Both a & b
- A. Treatment of shifting sand-dunes by fixing barriers in parallel stripes or in a chess-board design, using the local shrub material starting from the crest of the dunes to protect the seedlings from burial or exposure by the blowing of sand.
- B. Protection against biotic interference
- C. Both a & b
- D. None of these
Explanation
Shifting dunes are stabilized by barriers arranged in parallel strips or a chess-board pattern, followed by protection of planted seedlings from grazing and other biotic interference. Thus, both physical sand fixation and biotic protection are required.
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