Question

By arc auxanometer, we measure the growth in
A. Elongation
B. Thickness
C. Both A and B
D. None of the above

Answer 1

Hint: Sensitive auxanometers permit estimation of development as little as a micrometer, which permits estimation of development because of momentary changes in barometrical creation. Auxano Meters are utilized in the lab, the field, and the study hall. It is additionally called a circular segment pointer.

Complete answer:
Auxanometer (Gr. auxain= "to develop" + metron= "measure") is a contraption for estimating increment of development in plants.
It is utilized to gauge lengthening development among plants. Along these lines, choice ‘A’ is right
In an instance of a bend auxanometer , there is a wire fixed with the plant zenith toward one side and a dead-weight on the other.
It ignores a pulley which has a pointer connected to it.
When the plant's tallness expands, the pulley pivots and the pointer proceeds onward a round scale to legitimately give the extent of development.

Thus, alternative A is the right answer.

Note: An auxanometer otherwise called a bend marker is characterized as a mechanical assembly which is utilized for estimating the development in plants.
The importance of auxanometer is auxin represents to develop and metron represents the measure.
This contraption was developed by Koningsberger.
The contraption comprises an account gadget which is utilized for deciphering the expansion in the stature of the stem into the development of a needle over the scale.
These are intended for estimating prolongation in plants.