Step 1: Understanding the Concept.
Four school health standards are given, and one of them does not match the accepted guideline.
Step 2: Key Approach.
Go through each infrastructure rule and compare it with the standard recommendation used in school health practice.
Step 3: Detailed Explanation.
The 10 sq ft per student space rule matches the accepted floor space standard, so it stands as correct. The lighting rule, natural light from the left for a right handed child, also matches the standard classroom design guideline, so it is correct too. The toilet ratio, one urinal per 60 students and one latrine per 100 students, is likewise an accepted sanitation norm.
The desk rule is different. School furniture guidelines call for flat type desks sized to the child, since a flat surface supports good sitting posture and prevents spinal strain. A plus type desk design is not part of this recommendation, so this statement fails to match the guideline.
Step 4: Final Answer.
The incorrect statement is that desks should be of plus type, the accepted guideline calls for flat type desks instead.