What is the main distinction between graduated and non-graduated medicine droppers?

• A. Non-graduated droppers have marks to measure
• B. They are interchangeable
• C. Graduated droppers have markings to measure volume
• D. Both are used for the same purposes

Answer: (C)

The main idea is whether the dropper can show exactly how much liquid you've delivered. A graduated dropper has markings along its stem that let you read the volume and dose you’re dispensing, so you can measure precise amounts. A non-graduated dropper lacks those markings, so you can estimate the amount by eye or by counting drops, which isn’t a precise measurement.

That’s why the correct statement is that graduated droppers have markings to measure volume. The other options aren’t right because non-graduated droppers don’t have measurement marks, they aren’t necessarily interchangeable with graduated ones, and they aren’t used for exactly the same purpose since one provides measurable volumes while the other does not.