General Awareness · Science General

Inventors and Scientific Discoveries

4,616 Questions

This hub provides questions related to great inventors and their scientific discoveries. It covers the inventors of the telephone, radio, and microchips, alongside Nobel Prize winners. These facts are crucial for the general awareness section of major competitive exams.

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Inventors and Scientific Discoveries Questions

Multiple choice biology chemical coordination in plants cytokinins plant hormones plants and animal hormones

Kinetin was first isolated and identified by

  1. Charles Darwin

  2. Boysen and Jansen

  3. Paal

  4. Miller
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Kinetin is a type of cytokinin, a class of plant hormone that promotes cell division. Kinetin was originally isolated by Miller and Skoog et al., as compound from autoclaved herring sperm DNA that had cell division-promoting activity.

Multiple choice biology chemical coordination in plants cytokinins plant hormones plants and animal hormones

Kinetin was isolated by ...............

  1. Skoog and Miller

  2. Darwin and Lamarck

  3. Boysen and Jensen

  4. Went and Smit
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Kinetin is a type of cytokinin, a class of plant hormone that promotes cell division. Kinetin was originally isolated by Miller and Skoog et al, as a compound from autoclaved herring sperm DNA that had cell division-promoting activity. It was given the name kinetin because of its ability to induce cell division, provided that auxin was present in the medium. Kinetin is often used in plant tissue culture for inducing formation of callus and ti regenerate shoot tissues from callus.

Multiple choice biology chemical coordination in plants cytokinins plant hormones plants and animal hormones

First natural cytokinin was discovered by 

  1. Miller

  2. Letham

  3. Calvin

  4. Haberlandt
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Cytokinins are the growth hormones which was discovered by Miller. It mainly helps in the cell division. Kinetin was first discovered cytokinin which had the immense potential to promote cytokinesis. Zeatin is the natural cytokinin  traced in corn.
So, the correct answer is option A.
Multiple choice biology chemical coordination in plants cytokinins plant hormones plants and animal hormones

The first cytokinin was discovered by 

  1. Skoog

  2. Went

  3. Addicott

  4. Miller
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
The first cytokinin was isolated from herring sperm in 1955 by Miller. This compound was named as kinetin because of its ability to promote cytokinesis. Natural cytokinins are synthesized in regions where rapid cell division is occurring. e.g., root apices, developing shoot buds, young fruits etc.
Cytokinins overcome apical dominance. They promote nutrient mobilization that help in delay of leaf senescence.
Thus, the correct answer is option D.
Multiple choice biology chemical coordination in plants cytokinins plant hormones plants and animal hormones

First natural cytokinin was discovered by

  1. Skoog and Miller

  2. Letham

  3. Benson and Calvin

  4. Thimann and Went
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The first cytokinin was isolated from herring sperm in 1955 by Miller and his associates . This compound was named kinetin because of its ability to promote cytokinesis. Hall and deRopp reported that kinetin could be formed from DNA degradation products in 1955. The first naturally occurring cytokinin was isolated from corn in 1961 by Miller. It was later called zeatin. 

Therefore, the correct answer is option A.

Multiple choice business economics and quantitative methods introduction to micro economics microeconomics and macroeconomics : introduction economic ideas of j k mehta micro and macro economics

Who developed the innovation theory of profit?

  1. Schumpeter

  2. Haley

  3. Prof. Knight

  4. Karl Marx
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The 'Innovation Theory of Profit' was proposed by Joseph. A. Schumpeter who believed that an entrepreneur can earn economic profits by introducing successful innovations.

Multiple choice business economics and quantitative methods introduction to micro economics microeconomics and macroeconomics : introduction economic ideas of j k mehta micro and macro economics

The term microeconomics was coined by __________.

  1. Prof. A Samulson

  2. Giffen

  3. Prof. Ragner Frisch

  4. Eagle
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The term microeconomics was coined by Prof. Ragnar Frisch. In the Greek language ‘Mickros’ means very small. And thus microeconomics concerns itself with the small and individual part of the economy.

Multiple choice biology biotechnology and genetic engineering stds and infertility gm crops biotechnology

Whose discovery in mid-1980 overturned the idea that only proteins could be biological catalysts? 

  1. Monoclonal antibodies

  2. DNA probes

  3. Ribozymes

  4. RFLP
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Scientic theories about the origin-of-life theories have historically been characterized by the chicken-and-egg problem of which essential aspect of life was the rst to appear, replication or self-sustenance. RNA, the other nucleic acid, contained building blocks very similar to DNA, so biologists recognized early that RNA could store information in its linear sequences. With the discovery in the 1980s that RNA molecules were capable of biological catalysis, a function till now ascribed to proteins alone, RNA took on the role of the single entity that could act as both chicken and egg. Within a few years of the discovery of these catalytic RNAs (ribozymes) scientists had formulated an RNA hypothesis that posited an early phase in the evolution of life where all key functions were performed by RNA molecules. 

Therefore, the correct answer is option C.

Multiple choice biology cell biology and biotechnology stds and infertility gm crops biotechnology

Who discovered interferon?

  1. Isaacs and Lindenmann

  2. Holmes and Knight

  3. Hershey and Chase

  4. Enders
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

G.M. Findley and McCallum (1937) reported a phenomenon, called viral interference in which the cell infected with one type of virus becomes reisstant to superinfection by other viruses. Alliac Issacs and Lindeman (1957) gave the term interferons to the chemical substances responsible for the viral inference. 

Multiple choice business organisation management - nature, significance and scope management as an art, science and profession management as art, science and profession comparison of business, profession and employment levels and functions of management management functions functions and levels of management

"Hawthrone experiment", which was a real beginning of applied research in organisational behaviour was conducted by _________.

  1. Elton Mayo

  2. Henry Fayol

  3. F.W. Taylor

  4. Max Weber
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The Hawthorne Studies, conducted by Elton Mayo at Western Electric's Hawthorne Works, marked the beginning of applied research in organizational behavior. These studies revealed the importance of social factors and human relations in workplace productivity.

Multiple choice organization of commerce and management employee selection process meaning and steps in selection meaning, importance, methods and procedure of selection steps in employee selection process

Frederick Herzberg and his associates interviewed _________.

  1. 50 engineers

  2. 100 engineers

  3. 200 engineers

  4. 500 engineers
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Frederick Herzberg and his associates interviewed 200 engineers and accountants employed by firms in and around Western Pennsylvania. He asked these people to describe two important incidents at their jobs. First is when they feel particularly good and the second one is when they feel exceptionally bad about their job.