Biology MCQs

Page No. 22

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


aCrotical


bMedullary


cJuxtramedullary


dNone of these


View Answer Juxtramedullary

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


aProtonephridium


bMetanephridium


cMalpighian tubules


dNephrons


View Answer Malpighian tubules

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


aAmmonia


bUrea


cUric acid


dTrimethylamine oxide


View Answer Urea

Each ach nephridium of earthworm opens to the exterior by__________?


aNephrostome


bNephridiopore


cFlame cell


dAnus


View Answer Nephridiopore

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


a1 ml


b50 ml


c100 ml


d150 ml


View Answer 50 ml

Purine and pyrimidine metabolism results in production of____________?


aCreatinine


bTrimethyamine oxide


cXanthine


dNone of these


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.


bAccumulate waste in leaves, which fall in autumn.


cProduction of black wood in the center.


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



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


aCO2


bH2O


cO2


dBoth A and B


View Answer O2

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


aHagfish


bJelly Fish


cStar Fish


dBony fishes


View Answer Bony fishes

Most of the marine invertebrates are__________?


aOsmoconformers


bOsmoregulators


cBoth depend upon the concentration of sea water


dNone of these


View Answer Osmoconformers

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