Who discovered the phenomenon of specific biological chemical pathways known as carbon fixation or the dark reactions of photosynthesis? MCQ with Answer and Explanation

Question
Who discovered the phenomenon of specific biological chemical pathways known as carbon fixation or the dark reactions of photosynthesis?
A. Melvin Calvin
B. Hans Krebs
C. Louis Pasteur
D. Robert Emerson
Answer: Option A
Solution (By JKSSB Mock Tests)
Melvin Calvin traced the pathway of carbon absorption in plants using carbon-14, establishing the Calvin-Benson Cycle.
This question belongs to: Static General Knowledge Inventions and Discoveries
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Question #1
The first practical solar cell capable of converting significant sunlight into electricity was invented by whom at Bell Labs?
A. Albert Einstein
B. Gerald Pearson, Calvin Fuller, and Daryl Chapin
C. Charles Fritts
D. Theodore Maiman
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Correct Answer: Option B

Explanation:
In 1954, Pearson, Fuller, and Chapin developed the silicon photovoltaic cell, achieving around 6% energy efficiency.
This question belongs to: Static General Knowledge Inventions and Discoveries
Question #2
The discovery of the charge-coupled device (CCD), which replaces film with digital sensor pixels in cameras, was made by whom?
A. Charles Kao
B. Theodore Maiman
C. Fujio Masuoka
D. Willard Boyle and George E. Smith
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Correct Answer: Option D

Explanation:
Boyle and Smith invented the CCD at Bell Labs in 1969, fundamentally altering digital imaging, which won them a 2009 Nobel Prize.
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Question #3
The invention of the common mechanical device known as the marine depth tracker Echo Sounder was patented by whom?
A. Robert Watson-Watt
B. Heinrich Hertz
C. Alexander Behm
D. Guglielmo Marconi
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Correct Answer: Option C

Explanation:
German physicist Alexander Behm patented the sonic echo sounder depth locator apparatus in 1912 to prevent marine collisions.
This question belongs to: Static General Knowledge Inventions and Discoveries
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