Which of the following statement(s) is/are correct?
A. Only I
B. I and II
C. II and III
D. All of the above
Answer:D
Which of the following statement(s) is/are correct?
A. Only I B. I and II C. II and III D. All of the above
Explanation: Rapid increase in human population has placed a great strain on the land and soil resources resulting in land degradation and soil erosion. Soil is the uppermost layer of the earth’s crust, which can be dug or ploughed, and in which plants grow. Land is a solid, substratum which supports human and many other organisms. On a worldwide basis more than 4.85 billion acres (1.96 billion hectares) or 17% of the earth under vegetation has been degraded by humans to various extents.