The Crescograph, a device to measure the growth and response of plants, was invented by whom? MCQ with Answer and Explanation

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The Crescograph, a device to measure the growth and response of plants, was invented by whom?

A. Birbal Sahni

B. Prafulla Chandra Ray

C. Jagadish Chandra Bose

D. C.V. Raman

Answer: Option C

Solution (By JKSSB Mock Tests)

Sir Jagadish Chandra Bose invented the crescograph in the early 20th century to prove that plants have feelings and react to stimuli.

This question belongs to: Static General Knowledge Inventions and Discoveries

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Who discovered that certain types of chemical reactions produce electricity spontaneously, formalizing electrochemical cells?

A. Michael Faraday

B. Humphry Davy

C. Luigi Galvani and Alessandro Volta

D. Georg Ohm

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Correct Answer: Option C

Explanation:
Galvani observed muscle contractions from static discharges, and Volta channeled this into the continuous current metallic pile.

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Question #2

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Who discovered the therapeutic potential of the anti-malarial drug Artemisinin, winning a Nobel Prize in 2015?

A. Ronald Ross

B. Tu Youyou

C. Satoshi Ōmura

D. Charles Laveran

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Correct Answer: Option B

Explanation:
Tu Youyou extracted artemisinin from sweet wormwood plants based on traditional Chinese medical texts, saving millions from malaria.

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Question #3

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Who discovered the link between electricity and magnetism by observing a compass needle deflect near a current-carrying wire in 1820?

A. Hans Christian Ørsted

B. Michael Faraday

C. James Clerk Maxwell

D. André-Marie Ampère

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Correct Answer: Option A

Explanation:
Hans Christian Ørsted discovered electromagnetism when he noticed an electric current deflected a magnetic compass needle.

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