If the top soil has been eroded, we retire a land and grow over it:
Correct answer: B. Grasses
- A. Lichens
- B. Grasses
- C. Legumes
- D. Blue-green algae
Explanation
Grasses are planted first because their fibrous roots bind the exposed topsoil and rapidly provide ground cover. Lichens and blue-green algae may colonize bare surfaces naturally, but they are not the usual crop for rehabilitating eroded land.
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