Understanding the Crescograph and its Inventor

The question asks about the invention of the Crescograph, a specific instrument used to measure the growth rate of plants. This device is a significant contribution to the field of plant physiology.

Let's examine the options provided to identify the correct inventor:

• A. Hydar Ali: This name is not associated with scientific inventions related to plant growth.
• B. Satyendra Bose: Satyendra Nath Bose was a physicist known for his work on quantum mechanics and the Bose-Einstein statistics. His work was primarily in theoretical physics, not botanical instruments.
• C. Subrahmanyan Chandrashekhar: Subrahmanyan Chandrashekhar was an astrophysicist renowned for his theoretical work on the structure and evolution of stars. His research did not involve plant science or instrument invention for measuring plant growth.
• D. Jagadish Chandra Bose: Sir Jagadish Chandra Bose was a polymath, physicist, biologist, botantist, and archaeologist. He pioneered the investigation of radio and microwave optics, made significant contributions to plant science, and was a leading figure in applying physics to biology.

Sir Jagadish Chandra Bose invented the Crescograph to demonstrate the electrical nature of the stimuli response in plants and measure their growth with incredible precision. The instrument could magnify the tiny movements of plant growth up to 10,000 times, making it possible to study growth patterns in detail.

Therefore, the inventor of the Crescograph, the device for measuring growth in plants, is Jagadish Chandra Bose.

Key Concepts: The Crescograph and Plant Growth Measurement

The Crescograph is an early mechanical and optical device used for measuring the growth of plants. Its design was groundbreaking at the time, allowing for detailed observations of plant responses to various stimuli.

• Function: Measures extremely slow plant growth rates.
• Principle: Uses a series of levers and smoked glass plates or optical magnification to amplify and record the movement of a plant tip as it grows.
• Significance: Provided early scientific evidence of plant sensitivity and response, challenging conventional views that plants were unresponsive organisms.

Revision Table: Important Indian Scientists

Additional Information: Jagadish Chandra Bose's Contributions

Beyond the Crescograph, Jagadish Chandra Bose made several other significant contributions:

• Wireless Telegraphy: He did pioneering work on radio waves even before Marconi, although his focus was purely scientific, not commercial.
• Plant Physiology Experiments: Using his own instruments, he conducted extensive experiments demonstrating that plants have a form of sensitivity and response to stimuli, similar to animals.
• Resonance Recorder: Another instrument he invented to measure the response of plants to stimuli.
• Publications: Authored key books like "Response in the Living and Non-Living" and "The Nervous Mechanism of Plants".

His work was crucial in establishing the field of plant neurobiology and challenging the conventional understanding of plant life.