Question

Given below are two statements
Statement I: Land which is not producing green biomass consistently is called as culturable land
Statement II: A high‐density shelterbelt will provide a higher level of shelter over a shorter distance than a medium or low‐density belt.
In light of the above statements, choose the correct answer from the options given below

• A. Both Statement I and Statement II are true
• B. Both Statement I and Statement II are false
• C. Statement I is true but Statement II is false
• D. Statement I is false but Statement II is true

Hint:

Shelterbelt Paradox: Too thick = Short protection (due to turbulence). Moderately permeable (40-50%) = Longest protection. This is a very common question in agroforestry exams.

Answer 1

The Correct Option is D

Step 1: Understanding the Question:
The question tests definitions of land use and the physical principles of shelterbelts used in agroforestry and dryland management.
Detailed Explanation:

• Statement I analysis: Culturable land (or Arable land) is land capable of being used to grow crops. Land that is not producing green biomass consistently is usually termed wasteland or "barren/unculturable" land depending on why it's not producing. Culturable land is characterized by its potential for production, not its lack of it. Thus, Statement I is false.

• Statement II analysis: A high-density (very thick/impermeable) shelterbelt causes a large pressure drop immediately behind it. This creates intense turbulence and a "vortex" effect, which brings the wind back down to the ground very quickly. Consequently, the protected zone is short. A medium-permeability belt allows some air to leak through, reducing turbulence and providing a longer (though slightly less intense) protected zone. Thus, Statement II correctly identifies that high density results in a shorter protection distance. Statement II is true.

Step 2: Final Answer:
Statement I is incorrect, and Statement II is correct.