Biology MCQs

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The benefits of vermicomposting are to develop roots of the plants, improve the physical structure of the soil, and increase the fertility and water-resistance of the soil.

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The chief cells of the stomach secrete enzymes for protein breakdown (inactive pepsinogen and rennin). Hydrochloric acid activates pepsinogen into the enzyme pepsin, which then helps digestion by breaking the bonds linking amino acids, a process known as proteolysis.

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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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The diabetic person has higher sugar in blood. Glucose is a form of water soluble sugar. Excess blood sugar decreases the elasticity of blood vessels and causes them to narrow, impeding blood flow. This can lead to a reduced supply of blood and oxygen, increasing the risk of high blood pressure and damage to large and small blood vessels.

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Monotremes are mammals that lay eggs instead of giving birth to live young like marsupials and placental mammals. Among living mammals they include the platypus and four species of echidnas (or spiny anteaters).

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Vitamins are classified as either fat soluble (vitamins A, D, E and K) or water soluble (vitamins B and C).The fat soluble vitamins are soluble in lipids (fats); water-soluble vitamins are those that dissolve in water upon entering the body. Because of this, our body cannot store excess amounts of water-soluble vitamins for later use.

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The respiratory bronchioles are the narrowest airways of the lungs, one fiftieth of an inch across. The bronchi divide many times before evolving into the bronchioles. The bronchioles deliver air to the exchange surfaces of the lungs.

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Evolutionary biologists now classify wisdom teeth as vestigial organs, or body parts that have become functionless due to evolution. They believe wisdom teeth, or the third set of molars, were the evolutionary answer to our ancestor’s early diet of rough food – like leaves, roots, nuts and meats – which required more chewing power and resulted in excessive wear of the teeth. The modern diet with its softer foods has made the need for wisdom teeth nonexistent.

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Zika virus (ZIKV) is a member of the virus family Flaviviridae. It is spread by daytime-active Aedes mosquitoes, such as A. aegypti and A. albopictus. Its name comes from the Zika Forest of Uganda, where the virus was first isolated in 1947. Zika virus is related to the dengue, yellow fever, Japanese encephalitis, and West Nile viruses.

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Vitamin K is a group of structurally similar, fat-soluble vitamins the human body requires for complete synthesis of certain proteins that are prerequisites for blood coagulation. It is noteworthy for the synthesis of Prothrombin (coagulation factor II) that forms thrombin in the clotting process. Without vitamin K, blood uncontrolled bleeding occurs.