Biology MCQs

Page No. 22

Which of the following nephrons play important role in production of concentrated urine?


aCrotical

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bMedullary

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cJuxtramedullary

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dNone of these

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View Answer Juxtramedullary

Which of the following excretory structure is associated with gut of the organism?


aProtonephridium

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bMetanephridium

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cMalpighian tubules

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dNephrons

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View Answer Malpighian tubules

The main nitrogenous waste formed in the body of earthworm is/are___________?


aAmmonia

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bUrea

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cUric acid

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dTrimethylamine oxide

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View Answer Urea

Each ach nephridium of earthworm opens to the exterior by__________?


aNephrostome

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bNephridiopore

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cFlame cell

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dAnus

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View Answer Nephridiopore

Amount of water required to excrete 1gN of Urea is_________?


a1 ml

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b50 ml

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c100 ml

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d150 ml

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View Answer 50 ml

Purine and pyrimidine metabolism results in production of____________?


aCreatinine

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bTrimethyamine oxide

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cXanthine

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dNone of these

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View Answer Xanthine

Which of the following statement about conifers is correct?


aStored excretory products in vacuoles, at a concentration that leads to crystal formation.

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bAccumulate waste in leaves, which fall in autumn.

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cProduction of black wood in the center.

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dExcrete some of the waste materials directly into soil, occasionally using them as a chemical weapon against other competing plants.

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Which excretory product in produced in plants during autotrophic mode of life?


aCO2

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bH2O

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cO2

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dBoth A and B

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View Answer O2

Which of the following marine fishes are considered direct descendents of fresh water ancestors?


aHagfish

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bJelly Fish

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cStar Fish

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dBony fishes

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View Answer Bony fishes

Most of the marine invertebrates are__________?


aOsmoconformers

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bOsmoregulators

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cBoth depend upon the concentration of sea water

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dNone of these

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View Answer Osmoconformers

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