Auxanometer is required for

Studying rate of transpiration

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Measuring rate of respiration

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Finding out rate of photosynthesis

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Calculating rate of growth

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Solution

The correct option is C Calculating rate of growth
Auxanometer is a device used for measuring rate of growth in plants. It is also called as arc-indicator. It allows calculating growth as small as a micrometer. It helps in measuring the effects of environment on rate of growth of plant.
Thus, the correct answer is option D.

Suggest Corrections

Apparatus	Function
A. Ganong potometer	(i) Rate of growth
B. Cobalt chloride paper	(ii) Rate of transpiration
C. Pfeffer's auxanometer	(iii) Differential transpiration
D. Porometer	(iv) Opening and closing of stomata