Biology MCQs

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The Hypothalamus, positioned in the brain, is the gland responsible for the release of Neurohormone. Neurohormones are versatile and can perform various functions depending on the body’s needs, this can include releasing or inhibiting different hormones. This overall mechanism is critical to maintaining the body’s internal balance, or homeostasis, and oversees critical bodily functions, such as sleep, hunger, thirst, and body temperature.

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Leydig or interstitial cells of the testis secrete testosterone. It is present outside the seminiferous tubules in the interstitial spaces.

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A condition in which one or both of the testes fail to descend from the abdomen into the scrotum is called Cryptorchidism.

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Tularemia is also known as rabbit fever or deer fly fever. Tularemia is caused by the bacterium Francisella tularensis. The disease mainly affects rabbits and rodents.

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Phosphorus is the essential chemical fertilizer for better rhizobial nitrogen fixation.

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Vitamin C (Ascorbic acid) cures scurvy, which can cause abnormal gum bleeding. Excellent sources include citrus fruits such as oranges, lemons, limes, and grapefruits. Researchers examined 15 published studies involving 1,140 healthy people as well as data on 8,210 people from the CDC’s Health and Nutrition Examination Survey. They found that low vitamin C levels in the bloodstream were associated with an increased risk for gum bleeding with gentle probing.

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Cnidarian, also called coelenterate, any member of the phylum Cnidaria (Coelenterata), a group made up of more than 9,000 living species. ? Mostly marine animals, the cnidarians include the corals, hydras, jellyfish, Portuguese men-of-war, sea anemones, sea pens, sea whips, and sea fans.

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Heparin also known as un-fractionated heparin, a highly sulphated glycosaminoglycan, is widely used as an injectable anticoagulant, and has the highest negative charge density of any known biological molecule.

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An isogenic graft or Isograft is a graft between genetically identical individuals (i.e. monozygotic twins). This type of graft donot pose any form of tissue rejection threat by recipient’s body.

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Animals that have a cavity between body wall and digestive tract are known as coelomates for e.g.. annelids, molluscs, arthropods, Echinodermata, and chordates etc. In contrast, animals in which the body cavity is absent are known as acoelomates. Platyhelminthes is an example of acoelomates. The presence or absence of body cavity or coelom plays a very important role in the classification of animals.