Daily Practice Problems

📝 SolutionThe theory of chemical origin of life (proposed by Oparin and Haldane) suggests life arose from simple inorganic and organic molecules that combined under early Earth's reducing atmosphere.

📝 SolutionStanley Miller and Harold Urey passed electric sparks through a mixture of $CH_4$, $NH_3$, $H_2$ and water vapour, producing amino acids, showing organic molecules could form abiotically.

📝 SolutionDarwin proposed that organisms with heritable variations favourable to their environment survive and reproduce more (natural selection), leading to evolutionary change over generations.

📝 SolutionLamarck proposed that organs used more become stronger and those unused degenerate, and these acquired changes are passed to offspring — a theory now largely discredited.

📝 Solution'Fittest' means best adapted to the environment, and such organisms leave more surviving, reproducing offspring, not necessarily the physically strongest.