A question asks whether giving more water makes a plant grow better. How should the word better be made scientific?

Correct answer: Replace it with measured height or biomass

The direct answer is B: replace “better” with a measured height or biomass outcome. The word “better” is vague because different people may understand it differently: taller, heavier, healthier-looking, or producing more leaves. Science needs an operational definition, meaning a clear statement of exactly what will be measured and how. Option A is wrong because removing the word without naming an outcome leaves the question incomplete and untestable. Option B is correct because plant height can be measured with a ruler and biomass can be measured as mass, using a stated procedure and time period. Option C is wrong because “beautiful” is even more subjective and cannot give a consistent scientific measurement. Option D is wrong because “much better” is still vague and adds no measurement. A strong investigation could compare average height after a fixed number of days while keeping plant type, soil, light, and container conditions controlled. Memory cue: replace opinion words with a number, unit, time, and method whenever possible.