If Pond 2 has 10 more perch than Pond 1, what is this difference called?

• A. Perch difference in ponds
• B. Population difference in ponds
• C. Color difference in ponds
• D. Size difference in ponds

Answer: (A)

This question tests comparing the size of two groups. When Pond 2 has 10 more perch than Pond 1, you’re looking at how many more fish are in one pond than in the other. The way to name that difference is a perch difference in ponds—the difference in the perch population between the two ponds. The other options describe attributes like color or size, or use a more general term about population, but they don’t specify that we’re talking about the numerical difference in count of perch between ponds. So the phrase that best captures what’s changing is the perch difference in ponds.