D. Lamarck proposed the theory of natural selection.
Answer: Option A
Solution (By JKSSB Mock Tests)
Fossils are direct evidence showing transitional forms. Lamarck proposed use and disuse, not natural selection. Analogous organs do not indicate common ancestry; homologous do. Appendix is vestigial.
Explanation:
Oryza sativa is the scientific name of rice, the staple food for a large part of the world. Triticum aestivum is wheat, Zea mays is maize, Hordeum vulgare is barley. All are cereals of the Poaceae family.
Explanation:
Robert Hooke observed thin slices of cork under a microscope he designed and saw honeycomb-like compartments which he termed 'cells' in his 1665 book 'Micrographia'. Leeuwenhoek discovered living cells (bacteria, protozoa). Brown discovered the nucleus (1831), and Virchow proposed that all cells arise from pre-existing cells (1855). Hooke's cells were dead, empty cell walls of cork.
Explanation:
Approximately 70% of CO2 is transported in the blood as bicarbonate ions (HCO3-). CO2 diffuses into red blood cells, where it reacts with water to form carbonic acid, catalyzed by the enzyme carbonic anhydrase. Carbonic acid then dissociates into H+ and HCO3-, which moves into the plasma. About 20-25% is carried as carbaminohemoglobin.
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