Which of the following is a correct match of scientist and contribution?
A. Alexander Fleming - Pasteurization
B. Louis Pasteur - Discovery of penicillin
C. Edward Jenner - Smallpox vaccine
D. Robert Hooke - Discovery of bacteria
Answer: Option C
Solution (By JKSSB Mock Tests)
Edward Jenner developed the first successful smallpox vaccine (1796). Pasteur invented pasteurization and rabies vaccine, not penicillin. Fleming discovered penicillin. Hooke coined the term 'cell' but did not discover bacteria; Leeuwenhoek observed bacteria. Thus, the correct match is Jenner - smallpox vaccine.
Explanation:
Urine specific gravity, a measure of solute concentration, normally ranges from 1.015 to 1.030. It varies with hydration status: low when dilute (after drinking), high when concentrated (dehydration). Diabetes insipidus shows low SG, diabetes mellitus may show high due to glucose.
Explanation:
Rickets is characterized by weak, soft bones, bowed legs, and growth retardation due to impaired calcium deposition. In adults, equivalent is osteomalacia. Scurvy is vitamin C, pellagra niacin.
Explanation:
Euglenoids are unicellular eukaryotic organisms that possess characteristics of both plants (chloroplasts for photosynthesis) and animals (lack of a cell wall and presence of a flagellum for movement). Due to their unique features and unicellular nature, they are classified under the Kingdom Protista.
No comments yet. Be the first to start the discussion!