The scientist who discovered the bacterium that causes anthrax was: MCQ with Answer and Explanation

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The scientist who discovered the bacterium that causes anthrax was:

A. Robert Koch

B. Louis Pasteur

C. Joseph Lister

D. Edward Jenner

Answer: Option A

Solution (By JKSSB Mock Tests)

Robert Koch identified Bacillus anthracis as the causative agent of anthrax in 1876, establishing Koch's postulates for proving microbial disease causation. Pasteur developed vaccines, Jenner smallpox vaccine, Lister antiseptic surgery.

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Question #1

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Assertion (A): Double circulation is seen in birds and mammals.
Reason (R): It ensures complete separation of oxygenated and deoxygenated blood.

A. A false, R true.

B. A true, R false.

C. Both A and R are true, and R is the correct explanation.

D. Both A and R are true, but R is not the correct explanation.

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Correct Answer: Option C

Explanation:
Double circulation (pulmonary and systemic) with a four-chambered heart keeps oxygenated and deoxygenated blood separate, increasing efficiency. R correctly explains A.

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Question #2

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A network of interconnected food chains is called a:

A. Food web

B. Food pyramid

C. Trophic level

D. Ecological niche

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Correct Answer: Option A

Explanation:
A food web represents complex feeding relationships in an ecosystem, showing how multiple food chains are linked. Food chain is linear.

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Question #3

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Consider statements about scientists: 1. Edward Jenner is the father of immunology. 2. Alexander Fleming discovered penicillin. 3. Louis Pasteur discovered the structure of DNA. Which are correct?

A. 1, 2 and 3

B. 1 and 3 only

C. 2 and 3 only

D. 1 and 2 only

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Correct Answer: Option D

Explanation:
Edward Jenner is considered the father of immunology for pioneering the concept of vaccination by developing the smallpox vaccine. Alexander Fleming discovered the first antibiotic, penicillin, from the fungus Penicillium notatum in 1928. Louis Pasteur made monumental contributions to microbiology and vaccination, but the structure of DNA was discovered by James Watson and Francis Crick in 1953. Thus, statements 1 and 2 are correct.

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