Question

The crescograph was invented by ___
A. Dixon
B. J. C. Bose
C. Raman
D. Stephen Hales

Answer 1

Hint: The crescograph is a device that helps to measure the growth of plants. This device was invented by a Bengali scientist in the early 20^th century.

Step by step answer:An Indian botanist and biologist Dr. J. C. Bose was the person who invented the crescograph. The main two instrumental features of this device are – smoke glass place and a number of clockwise gears. The plate is used for a regular marking in the response to the record. Clockwise gears are used to measure the growth of the plant.
Hence, the correct answer is option B. J. C. Bose.
Additional information:
Similarly, Koningsberger developed another instrument that also helps to measure the plant growth – Auxanometer. The term auxanometer is derived from two words- auxin means to grow and metron means to measure. This apparatus is seen in many places like the laboratory, field, classrooms, etc.
This is also called arc – indicator. The needle of the device helps to measure the stem growth of the plant.

Note: Dixon was the inventor of pencil. He used to run a pencil factory in the US. Stephen Hales was the first person who described the method of blood pressure measurement. Raman invented a spectroscopic technique that helps to detect the low – frequency, vibration
and rotational modes of a molecule.