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X-rays (Roentgen-rays) were discovered on the 8th ofNovember, 1895 by the German physicist Wilhelm Conrad Roentgen.
Fifty days after the discovery of X-ray, on December 28, 1895. Wilhelm Conrad Roentgen published a paper about the discovery of X-rays – "On a new kind of rays"
X-rays cause mutation by deletion (deficiency, gene deletion, or deletion mutation).

A diamagnetic substance is weakly repelled by the both poles of a barmagnet.
When a magnet is brought near a bar magnet it gets magnetized.
The magnetization takesplace in a direction that is opposite to the external field.
When a diamagnet is at a distance from a bar magnet , the magnetic field deviates away from the diamagnet.

Mortar is a material used in masonry construction to fill the gaps between the bricks and blocks. Mortar is a mixture of sand, a binder such as cement or lime, and water and is applied as a paste which then sets hard.

In a p-type semiconductor the majority carriers of current are holes.

Red blood cell compatibility. Blood group AB individuals have both A and B antigens on the surface of their RBCs, and their blood plasma does not contain any antibodies against either A or B antigen. The blood group O has O- antigen (A glycoprotein on the surface of the RBC). The sequence of O antigen is Gal-NAG-Gal-Fuc. Due to expression of different GlycosylTransferase enzymes, different additional sugar molecules are added to the chain.

Edward Jenner used the term in 1798 in the long title ‘Inquiry into the Variolae vaccine known as the cow pox’.

He was also known as ‘Father of Immunology’.

Liquid ammonia act as a refrigerant in ice plants, When liquid ammonia vaporizes, it absorbs large quantities of heat without changing its temperature.

Photosynthesis is the process by which plants prepare their food like glucose from carbon dioxide and water in the presence of sunlight with the help of chlorophyll.
Transpiration is the loss of water from the aerial part of the plant to keep them and surrounding cool.

Ans:C.
Gold

Fuel of future – Hydrogen.
The gas used in incandescent lamps – Argon or Nitrogen.
The inert gases used in welding – Helium ,Argon.

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