Inventors and Scientific Discoveries

Charles Elton introduced the concept of ecological pyramids in the 1920s to represent the quantitative relationships between different trophic levels in ecosystems. These pyramids show how energy, biomass, or numbers decrease at each successive trophic level. Odum contributed to ecosystem ecology more broadly, while Morgan worked in genetics and Reiter in various biological fields. Elton's pyramid concept remains fundamental to understanding ecosystem structure and energy flow.

Carl Correns, along with Hugo de Vries and Erich von Tschermak, independently rediscovered Mendel's work in 1900, decades after its original publication. Correns specifically worked with corn and peas, confirming Mendel's laws of inheritance. Morgan, Muller, Bridge, and Robertson made significant contributions to genetics but came later, with Morgan establishing the chromosome theory of inheritance that built upon Mendel's foundation.

Richard Doll's 1950 study with Austin Bradford Hill was the first to establish the statistical link between smoking and lung cancer. This British doctor's research was groundbreaking in proving smoking's health risks. Otto Warburg studied cancer metabolism but not the smoking link.

Justus von Liebig was a pioneer in plant nutrition research who developed the Law of the Minimum, which states that plant growth is limited by the essential nutrient in shortest supply. His work in the 19th century established the foundation for modern agricultural chemistry by systematically studying how nitrogen, phosphorus, and other nutrients affect plant development. The other options made important contributions to chemistry and ecology but not specifically to plant nutrient research.

J.T. Rudd developed the method for determining whale age by analyzing the layers in whale ear plugs (earwax plugs). These layers, similar to tree rings, are deposited annually and can be counted to determine a whale's age. Rudd's work in the late 1950s provided marine biologists with the first reliable technique for aging whales, which was crucial for population studies and conservation efforts.

George Washington Carver, an African American agricultural scientist, developed hundreds of applications for peanuts and other crops to promote crop rotation and improve soil health in the South. His work at the Tuskegee Institute included creating products like peanut butter, cosmetics, dyes, and even medicinal compounds from peanuts. While exact counts vary, 'about 300' is a commonly cited figure reflecting his extensive research and innovation.

James Harrison, a Scottish-born Australian journalist, invented the mechanical refrigeration system used in modern refrigerators in 1856. His invention used ether as a refrigerant and laid the foundation for modern refrigeration technology. Torricelli invented the barometer, Benz invented the automobile, and Hunt invented the safety pin.

This is the correct option. C. L. A. Laveran in 1880 discovered the malarial parasite 'plasmodium'.

Alessandro Volta (not Alexandria Volta - there's a typo in the option) invented the first true battery (voltaic pile) in 1800. Faraday worked on electromagnetism, Galileo on astronomy/physics, Pythagoras on mathematics.

Michael Faraday invented the dynamo (electric generator) in 1831, establishing the principle of electromagnetic induction. Volta invented the battery, Galileo was an astronomer, Pythagoras a mathematician.

Michael Faraday formulated the laws of electrolysis in 1833, which describe the quantitative relationship between electric current and chemical change. Newton formulated laws of motion, Edison invented devices, Rutherford worked on nuclear physics.

Christian Huygens proposed the wave theory of light in 1678 in his Treatise on Light. Thomas Young later provided experimental evidence for it, while C.V. Raman worked on light scattering and Faraday on electromagnetism.

Thomas Alva Edison invented the commercially practical incandescent bulb in 1879. While others (including Swan) developed earlier versions, Edison's design with a carbonized bamboo filament was the first commercially successful one.