The thymus gland, which plays a key role in the maturation and functioning of the lymphoid system, is implicated in the acquired immune deficiency syndrome (AIDS). The observation that the thymic hormone, thymosin α₁, is elevated in individuals at risk for AIDS (as opposed to being depressed in other immunodeficient states) has provided the first direct evidence that the thymus is malfunctioning early in the course of this deadly disease.

Spermwere first observed in 1677 by Antonie van Leeuwenhoek using a microscope, he described them as being animalcules (little animals), probably due to his belief in preformationism, which thought that eachsperm contained a fully formed but smallhuman.

Rhinoceros (rhino) are protected in Kaziranga sanctuary at Sibsagar, Jorhat in Assam which was started in 1987.

Sunderlal Bahuguna(born 9 January 1927)is a noted Garhwalienvironmentalist and Chipko movement leader. The idea of Chipko movement was of his wife and the action was taken by him. For years he has been fighting for the preservation of forests in the Himalayas,first as a member of the Chipko movementin the 1970s, and later spearheaded the Anti-Tehri Dammovement starting 1980s, to early 2004.

Koch's postulates are not applicable to leprosy because the causative agent of leprosy, Mycobacterium leprae has never been grown on artificial media.

Colluvial soil is transported by gravity, alluvial soil is transported by water, eolian soil istransported by wind and glacial soil is transported by glaciers ie, large ice pieces.

Non Cleidoic egg-Eggmembranes are soft in theseeggse.g. All viviparous animals and in oviparous animals which layseggsin water.

Brazil is the Pioneer country in the production of fuel alcohol, which is used in automobiles like cars, buses and motorcycles as a substitute of petroleum.

Glycineis the amino acid that has a single hydrogen atom as its side chain. It is the simplest possible amino acid. The chemical formula ofglycineis NH₂‐CH₂‐COOH. Glycineis one of the proteinogenic amino acids, and is notable as the only one that is achiral.

Long fibres of cotton are called lint and small fibres are called fuzz. Lint are extractable while fuzz are non-extractable