Biology MCQs

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The main function of the cornea present in the human eye is to bend light before it reaches the lens.

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The stomach receives the majority of its blood supply from the Coeliac axis.

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The thymus gland is located above the heart, inside the chest cavity. It is important for the development of the T cell inside the body. It is largest in children and starts shrinking as you reach puberty and changes to fat.

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A hormone, which is released by the posterior pituitary is Oxytocin. The posterior pituitary does not synthesize hormones, but it is able to store and release the two hormones.

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Bacteria, cyanobacteria and fungi are the main sources of biofertilizers. These trap atmospheric nitrogen and reduce it to ammonia and make it available to plants. They also convert insoluble phosphates into forms required by plants.

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Green diesel is also a type of biofuel, produced by hydrocarbon oil and fat feedstock. Bio-ethers and Re-formulated gasoline are also a type of biofuels.

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Leptospirosis is a bacterial disease caused by corkscrew-shaped bacteria called Leptospira. Signs and symptoms can range from none to mild such as headaches, muscle pains, and fevers; to severe with bleeding from the lungs or meningitis. If the infection causes the person to turn yellow, have kidney failure and bleeding, it is then known as Weil’s disease.

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Chickenpox, also known as varicella, is a highly contagious infection caused by the varicella zoster virus. The disease results in a characteristic skin rash that forms small, itchy blisters, which eventually scab over. It is an airborne disease which spreads easily through the coughs and sneezes of an infected person.

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Alzheimer’s disease is a progressive neurologic disease of the brain leading to the irreversible loss of neurons and the loss of intellectual abilities, including memory and reasoning. These with time become severe enough to impede social or occupational functioning. Alzheimer’s disease is also known as simply Senile Dementia.

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The average adult has a blood volume of roughly 4-5 to 5 litres, which is composed of plasma and several kinds of cells. By volume, the red blood cells constitute about 45% of whole blood, the plasma about 54.3%, and white cells about 0.7%.