Charles Darwin proposed the theory of natural selection based on observations during his voyage on:
A. HMS Victory
B. HMS Endeavour
C. HMS Challenger
D. HMS Beagle
Answer: Option D
Solution (By JKSSB Mock Tests)
Darwin traveled as a naturalist on the HMS Beagle (1831-1836) and made extensive observations, especially in the Galápagos Islands. His observations of finches' beak adaptations led to the concept of natural selection as the mechanism for evolution. 'On the Origin of Species' (1859) laid out his theory. HMS Challenger was an oceanographic expedition. HMS Endeavour was Captain Cook's ship.
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ADH (vasopressin) from the posterior pituitary increases water permeability of collecting duct cells by inserting aquaporins, reducing urine volume.
Explanation:
B lymphocytes differentiate into plasma cells that produce antibodies (immunoglobulins) against specific antigens, providing humoral immunity. T cells mediate cellular immunity, macrophages and neutrophils are phagocytes.
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