Biology MCQs

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Down’s 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.Down’s syndrome is the most common chromosome abnormality in humans. It is typically associated with a delay in cognitive ability (mental retardation, or MR) and physical growth, and a particular set of facial characteristics

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Night blindness is caused by nearsightedness, cataracts, or vitamin A deficiency. Night blindness (nyctalopia) is the inability to see well at night or in poor light. Its causes include glaucoma medications and cataracts

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Mycology is the branch of biology concerned with the study of fungi, including their genetic and biochemical properties, their taxonomy and their use to humans as a source for tinder, medicine, food, and entheogens, as well as their dangers, such as toxicity or infection.

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Iron is also found in many plant-based foods such as:
• Green vegetables, for example spinach, silverbeet and broccoli
• Lentils and beans
• Nuts and seeds
• Grains, for example whole wheat, brown rice and fortified breakfast cereals
• Dried fruit

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Men determine the sex of a baby depending on whether their sperm is carrying an X or Y chromosome. An X chromosome combines with the mother’s X chromosome to make a baby girl (XX) and a Y chromosome will combine with the mother’s to make a boy (XY).

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The digestive functions of saliva include moistening food, and helping to create a food bolus, so it can be swallowed easily. Saliva contains the enzyme amylase that breaks some starches down into maltose and dextrin. Thus, digestion of food occurs within the mouth, even before food reaches the stomach.

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Nitrogen fixing plants don’t pull nitrogen from the air on their own. They actually need help from a common bacteria called Rhizobium. The bacteria infect legume plants such as peas and beans and use the plant to help it draw nitrogen from the air.

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Average fat content in buffalo milk is 7.2% and average fat content in cow milk is 4.4%. As per the nutrient components, buffalo milk contains all the nutrients in higher proportion than cow’s milk.

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Alziemer’s is a disease which attacks the neural system, It results in continuous decline in the number brain cells which leads to loss of memory.

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Cod liver oils from fish are rich in vitamins A and D and hence these are recommended for the chikdren to prevent the rickets(bone deformation).