Hydrometer is used in soil analysis to determine:

Correct option is D

A hydrometer is a device used to measure the relative density (or specific gravity) of liquids. In soil analysis, it is primarily used to determine soil texture by measuring the distribution of sand, silt, and clay particles. This is done by observing how the soil particles settle in a suspension. The rate at which particles settle helps determine the proportions of sand, silt, and clay, which are important indicators of soil texture.