Multiple Choice Questions

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Cattle fed with spoilt hay of sweet clover which contains dicumarol

  • are healthier due to a good diet

  • catch infections easily

  • may suffer vitamin K deficiency and prolonged bleeding

  • may suffer from beri beri due to deficiency of B vitamins.


C.

may suffer vitamin K deficiency and prolonged bleeding

During the process of spoiling, the coumarins in sweet clover are converted to toxic dicumarol, a potent vitamin K antagonist and anticoagulant. Any method of hay storage that allows molding of sweet clover promotes the likelihood of formation of dicumarol in the hay. Weathered, large round bales, particularly the outer portions, usually contain the highest concentrations of dicumarol.

When toxic hay or silage is consumed for several weeks, dicumarol alters proenzymes required for synthesis of prothrombin, resulting in hypoprothrombinemia (by preventing formation of the active enzyme). It probably also interferes with synthesis of factor VII and other vitamin K–dependent coagulation factors. Dicumarol concentrations of 20–30 mg/kg of hay ingested throughout several weeks are usually required to cause poisoning in cattle.

The toxic agent crosses the placenta in pregnant animals, and newborn animals may be affected at birth. All species of animals studied are susceptible, but instances of poisoning involve cattle and, to a limited extent, sheep, pigs, and horses.


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The Great Barrier Reef along the east coast of Australia can be categorised as

  • population

  • community

  • ecosystem

  • biome.


Which one of the following is a pair of endangered species

  • Garden lizard and Mexican poppy

  • Rhesus monkey and Sal tree

  • Indian peacock and carrot grass

  • Hornbill and Indian aconite


Which one of the following is a matching pair of a drug and its category

  • Amphetamines - stimulant

  • Lysergic acid dimethyl amide - narcotic

  • Heroin - psychotropic

  • Benzodiazepine - pain killer


A baby has been born with a small tail. It is a case exhibiting

  • retrogressive evolution

  • mutation

  • atavism

  • metamorphosis


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Which one of the following is correctly matched regarding an Institute and its location

  • National Institute of Virology - Pune

  • National lnstitute of Communicable Diseases - Lucknow

  • Central Drug Research Institute - Kasauli

  • National Institute of Nutrition - Mumbai


Electron beam therapy is a kind of radiation therapy to treat

  • Enlarged prostrate gland

  • Gall bladder stones by breaking them

  • Certain types of cancer

  • Kidney stones.


Severe Acute Respiratory Syndrome (SARS)

  • is caused by a variant of Pneumococcus pneumonia

  • is caused by a variant of the common cold virus (coronavirus)

  • is an acute form of asthma 

  • affects non-vegetarians much faster than the vegetarians


If the Bengal Tiger becomes extinct

  • hyenas and wolves will become scars

  • the wild areas will be safe for man and domestic animals

  • its gene pool will be lost forever

  • the populations of beautiful animals like deers will get stabilized.


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Nitrogen oxides produced from the emission of automobiles and power plants, are the source of fine air borne particles which lead to

  • photochemical smog

  • dry acid deposition

  • industrial smog

  • wet acid deposition