Question

Who invented the instrument “Crescograph”:
A) Vikram A Sarabhai
B) Jagadish Chandra Bose
C) C V Raman
D) Satyendra Nath Bose

Answer 1

Hint: The Crescograph is the instrument that is used for the measurement of growth in the plants. This instrument is given the different rates of growth under different stimuli. The Crescograph is also used to measure under different temperatures, chemicals, gases, and electricity.

Complete step by step answer:
The Indian Scientist Jagadish Chandra Basu invented the instrument “Crescograph.” Jagadish Chandra Basu is known for pioneering discoveries in the field of plant psychology.
The Crescograph consists of a series of clockwork gears, a smoked glass plate. The smoked glass plate is used to record the movement at the tip of the plant. The smoked plate is also used to magnify up to 10000 times by using the two livers in which one liver is used to record 100 times magnified while the other liver is used to magnify 100 times the already magnified image.
In Crescograph, one wire is gently attached at one end to a plant and, on the other hand, delicate clockwork to measure the plant's rate of growth in one hour. Bose used this Crescograph to study the change in behavior of the plant under different lighting conditions.

$\therefore$ Jagadish Chandra Bose invented the instrument “Crescograph” and therefore, from the given options, only option B is correct.

Note:
Jagadish Chandra Basu is a well-known Indian plant physiologist known for his contributions to the field botany. He invented a highly sensitive instrument to measure the response of the plants. Jagadish Chandra Bose proved that plants have life. He also wrote a book about plant response named “Response of living and non -living."