Biology MCQs

Page No. 19

In osmosis water molecules move from area of _____________ through semipermeable memberane?


aHigher solute concentration to lower solute concentration


bLower solute concentration to higher solute concentration


cLower solvent concentration to higher solvent concentration


dAll of these



Normal body temperature in mamals like human beings is____________?


a26 – 28°C


b36 – 38°C


c46 – 48°C


d56 – 58°C


View Answer 36 – 38°C

Which of the following fish drink large amount of sea water and excrete concentrated urine resulting in maximum salt excretion and minimal water loss?


aHagfish


bFresh water fishes


cBony fishes


dNone of these


View Answer Bony fishes

Which of the following statement about Homeostasis is incorrect?


aThere is a definite control system that regulates the homeostatic activities


bHomeostatic mechanisms keep the internal environment fixed despite of wide changes in external environment


cBecause of this the fluctuations of internal environment are of extremely narrow range as compared to that of external environment


dAll are correct



Which adaptation is acquired by plants of cooler areas to prevent lipid crystal formation in cell membrane?


aChange in membrane protein composition.


bChange in the solute composition of the cell membrane which prevents crystallization.


cIncrease in proportion of unsaturated fatty acids.


dDevelopment of heat shock proteins.



Which of the following mechanism explains development of anemia in Renal failure?


aFailure of bone marrow is accompanied with renal failure.


bDestruction of RBC results from accumulated urea in the blood.


cChronicity of the disease is respobsible for anemia


dFailure of proper RBC synthesis, due to lack of chemical stimulation.



Which of the following constituent is/are maximum in the filtrate that leaves proximal convoluted tubules?


aGlucose


bAmino acids


cNitrogenous waste


dAll of these


View Answer Nitrogenous waste

Protonephridia are present in____________?


aRound worms


bFlateworm


cTape worms


dSegmented worms


View Answer Flateworm

Aquatic animals excrete nitrogenous waste commonly in the form of_____________?


aAmmonia


bUrea


cUric acid


dTrimethylamine oxide


View Answer Ammonia

Terrestrial animals like kangaroo rat survive even without drinking water since__________?


aThey don’t require water for their metabolic process


bThey can retain excessive water in their body during raining season.


cThey feed on carbohydrate rich seeds which can provide them with metabolic water


dThey are anhydrobiotic organisms



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