Step 1: Understanding the Concept:
Livestock housing should be designed for climatic conditions.
Some design principles are important.
Step 2: Key Formula or Approach:
No specific formula.
Need to know livestock housing principles.
Step 3: Detailed Explanation:
Statement A: It is impossible to design an ideal building for all regions - correct.
Statement B: Conventional barns and loose houses are the main types - correct.
Statement C: Long narrow buildings with roof on pillars are suitable for hot humid regions - correct.
Statement D: Outer surface of roof should be white or reflective in hot-dry regions, not black.
Black absorbs heat and is not suitable.
Thus, Statement D is NOT correct.
Step 4: Final Answer:
The statement about black roof is NOT correct.
Hence, the correct option is (D).