By arc auxanometer,we measure the growth in

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(A) The arc auxanometer is a device used to measure the rate of growth in the length of a plant stem.It works on the principle of a lever system where

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Elongation

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(A) The arc auxanometer is a device used to measure the rate of growth in the length of a plant stem.It works on the principle of a lever system where the elongation of the stem causes a pointer to move along an arc.The actual growth in length is calculated using the formula:$	ext{Actual growth} = \frac{	ext{Distance travelled by pointer} 	imes 	ext{Radius of pulley}}{	ext{Length of pointer from centre of pulley}}$Therefore,it specifically measures elongation (increase in length).

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