Tag: science & technology

Air resistance is the force that opposes the motion of objects through air. It's caused by air particles colliding with the moving object, creating drag that slows it down. This force increases with speed and surface area.

Septicemia is a bloodstream infection (sepsis) and not a disease of the lungs. Tuberculosis, Silicosis, and Pleurisy are all lung-related conditions. TB is bacterial, Silicosis is from dust inhalation, and Pleurisy involves inflammation of lung lining.

Charles Darwin developed the modern theory of evolution through natural selection, published in 'On the Origin of Species' (1859). Gregor Mendel worked on genetics, Theodor Schwann on cell theory, and Thomas Morgan on chromosomes.

Leaching is the process where water carries dissolved minerals downward through soil layers. Tropism is plant growth response, Induration is soil hardening, and Diagenesis is rock transformation.

Asteroids and meteoroids are both small rocky bodies that orbit the Sun. The main difference between them is size - asteroids are larger (typically over 1 meter in diameter), while meteoroids are smaller. Both can become meteors (shooting stars) if they enter Earth's atmosphere and burn up.

Pluto has the longest orbital period of about 248 years among the bodies listed, taking nearly two and a half centuries to complete one orbit around the Sun. While Pluto was reclassified as a dwarf planet in 2006, it remains the smallest body in its orbital category with the most distant orbit.

Toothbrush handles are typically manufactured using injection molding machines. This process injects molten plastic into molds to create the handle shape, which is then cooled and ejected. The bristles are inserted separately into pre-formed holes in the handle.

Erythrocytes (red blood cells) contain hemoglobin, the iron-rich protein that binds oxygen and transports it throughout the body. Leukocytes are white blood cells and platelets are cell fragments involved in clotting.

Persistence of vision is the correct answer because the human eye retains an image for approximately 1/16th of a second after it disappears. This allows sequential still images shown rapidly (like in film at 24 frames per second) to blend into smooth continuous motion. Parallax view refers to apparent position changes, photoreception is the general process of detecting light, and vanishing point is an artistic perspective technique.

Blue whales are the largest animals known to have ever lived on Earth, reaching lengths up to 100 feet and weights of 200 tons. They are significantly larger than any dinosaur discovered. The African elephant is the largest land animal alive today, but the blue whale outweighs it by many times.