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John Logie Baird FRSE was a Scottish engineer, innovator, one of the inventors of the mechanical television, demonstrating the first working television system on 26 January 1926, and inventor of both the first publicly demonstrated colour television system, and the first purely electronic colour television picture tube.

A real image is one that can be caught on a screen. Concave mirrors can be used to get the real image of an object. To get real images the object should be placed at the principal focus or beyond the principal focus of the mirror, i.e. at a distance greater than or equal to f, the focal length of the mirror.

An autosome is a chromosome in a eukaryotic cell that is not a sex chromosome. Unlike prokaryotic cells, eukaryotic cells have many chromosomes in which they package their DNA. This allows eukaryotes to store much more genetic information.

A pair of contrasting characters means that there are 2 variants for a single character. You can see in Mendel’s experiment that he always chose 2 variants of a character. Round seed and yellow seed for seed shape etc. Mendel worked with 14 true-breeding traits OR 7 pairs of contrasting characters

John Napier acquired international fame for his contribution to mathematics, primarily by the invention of logarithms in 1614 and to a lesser extent by the development of Napier s bones or rods and a mnemonic for formulas used in solving spherical triangles.

X-rays were discovered in 1895 by Wilhelm Conrad Roentgen (1845-1923) who was a Professor at Wuerzburg University in Germany. Working with a cathode-ray tube in his laboratory, Roentgen observed a fluorescent glow of crystals on a table near his tube.

Bushnell is credited with creating the first submarine ever used in combat, while studying at Yale in 1775, . He called it Turtle because of its look in the water. His idea of using water as ballast for submerging and raising his submarine is still in use, as is the screw propeller, which was used in Turtle.

The integuments develop into the seed coat when the ovule matures after fertilization.

The mushroom basidiocarp is typically composed of a stipe that elevates the basidiocarp above the substrate, a pileus and in some species a partial veil that encloses and protects the lamella as the basidia and basidiospores are developing

Parathyroid hormone (PTH), also called parathormone or parathyrin, is a hormone secreted by the parathyroid glands that regulates the serum calcium through its effects on bone, kidney, and intestine.

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