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Down syndrome also known as trisomy 21,is a genetic disorder caused by the presence of all or part of a third copy of chromosome 21.

The pineal gland is a tiny endocrine gland found in the brain. It produces and secretes the hormone melatonin, which is a hormone that helps regulate biological rhythms such as sleep and wake cycles. The secretion of melatonin is inhibited by light and triggered by darkness.

Gravitropism is a coordinated process of differential growth by a plant or fungus in response to gravity pulling on it. It is a general feature of all higher and many lower plants as well as other organisms.

Phototropism is the growth of an organism which responds to a light stimulus. It is most often observed in plants, but can also occur in other organisms such as fungi. The cells on the plant that are farthest from the light have a chemical called auxin that reacts when phototropism occurs.

The growth of a plant part due to chemical stimulus is known as chemotropism ‘Chemotropism is the growth of organisms such as bacteria and plants, navigated by chemical stimulus from outside of the organism or organism’s part.

Microcrystalline wax is highly viscous, it has good extensibility, does not become brittle. It is very soluble in chloroform, ether, benzene, petroleum ether, carbon.

Tinning is the process of thinly coating sheets of wrought iron or steel with tin, and the resulting product is known as tinplate. The term is also widely used for the different process of coating a metal with solder before soldering.

Gay-related immune deficiency (GRID) was the original name for a disease currently known as AIDS.
Anthrax can be found naturally in soil and commonly affects domestic and wild animals around the world.
Sars – A contagious and sometimes fatal respiratory illness caused by a coronavirus.
Plague- A rare but serious bacterial infection that’s transmitted by fleas.

Azolla can be used as an animal feed a human food, a medicine and water purifier.
Bacteria – Bacteria are a type of biological cell.
Fungi -Microorganisms such as yeasts and molds, as well as the more familiar mushrooms.
Lichens – A simple slow-growing plant that typically forms a low crusty, leaf like, or branching growth on rocks, walls, and trees.

Tusks are elongated, continuously growing front teeth, usually but not always in pairs, that protrude well beyond the mouth of certain mammal species. They are most commonly canines, as with warthogs, pig, and walruses, or, in the case of elephants, elongated incisors. In most tusked species both the males and the females have tusks although the males’ are larger. Tusks are generally curved, though the narwhal’s sole tusk is straight and has a helical structure. In the elephant, the tusks were originally first canons.

Caffeine is a stimulant obtained from over 60 different types of plants worldwide. The scientific name for caffeine is 1,3,7-trimethylxanthine. Caffeine is considered to be the most commonly used psychoactive drug in the world. Coffee, soda, and tea are the most common sources of caffeine in the diet.
Nicotine- a toxic colourless or yellowish oily liquid which is the chief active constituent of tobacco.
Aspirin- a tablet of any mild painkilling drug.

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