Biology MCQs

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Arsenicosis or Black foot is caused by exposure over a period of time to Arsenic in drinking water. It may also be due to intake of arsenic via food or air. Kindly note that Itai-itai disease is caused by Cadmium poisoning.

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Plasma is 55% of the blood by volume and constitutes 5% of the body weight. Plasma is a pale yellow transparent clear fluid which consists of 90-92% water and 8-10% organic and inorganic substances. Organic substances are mainly plasma proteins viz. albumin, globulin, prothrombin and fibrinogen. Albumins are responsible for maintenance of osmotic pressure of Blood. Globulins are chief sites for formation of antibodies; while prothrombin and fibrinogen are essential for clotting of blood

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Tocopherols are a class of organic chemical compounds, many of which have vitamin E activity. Deficiency of Tocopherol leads to sterility in males and females. Tocopherol exists in four different forms designated as α, β, δ, and γ.

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Cuttle fish or cuttles are marine molluscs of the order Sepiida. Molluscs are an important phylum of invertebrate animals. It is the second-largest phylum of invertebrate animals after the Arthropoda.

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Marsh Mallow is not a carnivorous plant. Whereas Pitcher plant, Venus Fly Trap and waterwheel plant are carnivorous plants. Carnivorous plants derive some or most of their nutrients from trapping and consuming animals or protozoans, typically insects and other arthropods.

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A pleura is a serous membrane which folds back onto itself to form a two-layered membranous pleural sac. It surrounds each lung and attach to the internal surface of the thoracic cavity.

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Beta cells secrete insulin. Destruction of beta cells in the pancreas will halt the production of insulin. Therefore, eliminate answer choices (A), (B) and (C). This will lead to an increase in blood glucose levels.

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Alzheimer's is caused by brain cell death. It is a neurodegenerative disease, which means there is progressive brain cell death that happens over a course of time. It is caused due to deficiency of acetylcholine.

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Mesonephros is permanent kidney of frog and most fish, developing posterior to and replacing the pronephros of the embryonic and larval stages. It is a paired organ consisting of a set of nephrons having capsules that filter blood from the glomerulus and tubules whose cells reabsorb water and nutrients and secrete nitrogenous wastes.

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The chemical name of Vitamin B3 is Niacin which is a water soluble vitamin. It is an important nutrient. In fact, every part of your body needs it to function properly. As a supplement, niacin may help lower cholesterol, ease arthritis and boost brain function, among other benefits.