Question

A sophisticated instrument designed by J.C. Bose was so sensitive that is could record even the minute growth of a plant upto a millionth part of millimeter is

• A. Crescograph
• B. Micrograph
• C. Thermograph
• D. Monograph

Hint:

J.C. Bose is renowned for his interdisciplinary research, particularly in radio and microwave optics, plant physiology, and the invention of the crescograph.

Answer 1

The Correct Option is A

Step 1: Understand the question.
The question asks to identify the instrument designed by J.C. Bose that was capable of measuring even minute plant growth up to a millionth part of a millimeter. Step 2: Recall J.C. Bose's contributions to science, specifically in plant physiology.
J.C. Bose (Jagadish Chandra Bose) was a pioneering Indian physicist, biologist, botanist, and archaeologist. He made significant contributions to the study of plant physiology, including the detection of plant responses to various stimuli. Step 3: Evaluate the given options. \begin{itemize} \item Crescograph: A crescograph is a device for measuring the growth of plants. It was invented by Sir Jagadish Chandra Bose. It measures the minute increase in the size of plants, up to 1/1,000,000th of an inch. This perfectly matches the description in the question. \item Micrograph: A micrograph is a photograph or digital image taken through a microscope. It is used to view very small objects, but it is not an instrument for measuring plant growth. \item Thermograph: A thermograph is an instrument that records changes in temperature. It is used for temperature measurement, not plant growth. \item Monograph: A monograph is a detailed scholarly book or study on a single specialized subject or an aspect of it. It is a written work, not a scientific instrument. \end{itemize} Step 4: Conclude based on the evaluation.
Based on the functions of the instruments listed, the Crescograph is the correct answer as it was invented by J.C. Bose to measure minute plant growth. The final answer is $\boxed{\text{Crescograph}}$.