Tag: science & technology

Oparin proposed the theory of chemical evolution, suggesting life arose from gradual chemical reactions in Earth's early atmosphere (the Oparin-Haldane hypothesis). Darwin focused on natural selection and evolution by natural means, Lamarck on inheritance of acquired traits, and Haeckel on embryology and recapitulation theory.

Exobiology (also called astrobiology) is the study of potential life beyond Earth. The prefix 'exo-' means 'outer' or 'outside,' referring to extraterrestrial environments. The other options are not standard biological terms.

Faraday is incorrectly paired with gas diffusion - he is famous for electromagnetic induction, electrolysis laws, and discoveries in electricity and magnetism. Graham is actually known for gas diffusion. All other pairs are correctly matched: Roentgen discovered X-rays, Newton formulated gravitation laws, and Pasteur founded bacteriology.

Paper is measured in reams (typically 500 sheets) and caliper (thickness measurement). This standard industry practice allows for consistent paper quantity and thickness specifications in printing and manufacturing.

Salt lowers the melting point of water through freezing point depression, which is why it's used to melt ice on roads in winter. This physical principle makes salt effective at melting snow and ice at temperatures below water's normal freezing point.

Kolkata houses the first Science City of Asia, established as a major science center and popular science destination. This pioneering institution features interactive exhibits, a space theater, and various scientific demonstrations.

Carbon dioxide fits all the clues: used in carbonated drinks, something people enjoy savoring, essential for photosynthesis in plants, yet harmful in excess in the atmosphere. CO2 is the greenhouse gas that creates this dual nature - beneficial at appropriate levels but damaging when overabundant.

The ozone layer is located in the stratosphere, approximately 15-30 kilometers above Earth's surface. It absorbs harmful ultraviolet (UV) radiation from the sun, protecting living organisms from DNA damage and conditions like skin cancer. The riddle's reference to being 'up above the world' and 'protecting' directly points to this atmospheric layer.

Polar bears are the largest land predators in the Arctic, characterized by their white fur and massive size. They are classified as marine mammals and are threatened by climate change causing sea ice loss. The riddle describing an 'Arctic giant' that is 'furry, huge and white' directly matches the polar bear.

Earth is often referred to as 'Mother Earth' because it has sustained all life since its beginning. The planet provides shelter, resources, and conditions necessary for life. The riddle's imagery of being 'a mother to you all' and 'providing shelter since life started' clearly personifies Earth.