The instrument by which the rate of growth of stem is accurately measured is
Or
Growith in langth of a plant can be measured by

Options

A. Hydrometer
B. Auxanometer
C. Osmometer
D. Potometer

Answer

B

Explanation

An auxanometer is an apparatus for measuring increase of growth in plants. In case of an arc-auxanometer, there is a wire fixed with the plant apex on one end and a dead-weight on the other.