Biology MCQs

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Hemoglobin in humans has a very high affinity for carbon monoxide, forming carboxyhemoglobin which is a very bright red in color. Carbon monoxide is thus problematic for humans because it has affinity higher than that of oxygen.

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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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Auxins are a class of plant hormones with some morphogen-like characteristics. Auxin is basically a Weak Organic Acid and It is produced in the stem tip that promotes the elongation in the cells.

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Vitamin A, D & C are respectively called as Retinol, Calciferol and Ascorbic Acid. Vitamin A is essential for good vision, a healthy immune system, and cell growth. Vitamin D is a fat-soluble vitamin whereas Vitamin C is a water-soluble vitamin which is found in many foods, particularly fruits and vegetables.

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A fibrous root system is universal in monocotyledonous plants and ferns. It is the opposite of a taproot system and usually formed by thin, moderately branching roots growing from the stem. Fibrous root system is present in grass.

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Calcium is required in plants in the formation of cell wall. It is a structural layer surrounding some types of cells, just outside the cell membrane. The cell wall can be tough, flexible, and sometimes rigid also.

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The cultivation of Jatropha curcas on wastelands has a potential to generate biofuel in large quantities. It is a species of flowering plant in the spurge family called Euphorbiaceae, that is native to the American tropics, most likely in Mexico and Central America.

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Britain is the first country to issue research licenses for human embryonic cloning to create stem cells. The cloning procedure involves the process of combining a patient’s body cell with an unfertilized egg cell from a donor.

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The most common antioxidant found in Red Wine is Polyphenol. It has been demonstrated by the scientists that, certain wines such as Red Wine posses health benefits because they contain antioxidants, which work in the body as Free Radical Scavengers and slow the oxidation of other molecules by capturing the free radicals.

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Bombay Blood Group is an extremely rare ABO group, called so because it was first discovered among some people in Bombay. Their red cells lack ABH antigens and their sera contain anti-A and anti-B and anti-H. The anti-H would not be detected in the ABO group but would be detectable in pretransfusion tests. People who have Bombay phenotype can donate to any member of the ABO blood group system (unless some other blood factor gene, such as Rhesus, is incompatible), but they cannot receive any member of the ABO blood group system`s blood (which always contains one or more of A and B and H antigens), but only from other people who have Bombay phenotype