Biology MCQs

Page No. 19

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


aHigher solute concentration to lower solute concentration

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bLower solute concentration to higher solute concentration

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cLower solvent concentration to higher solvent concentration

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dAll of these

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Normal body temperature in mamals like human beings is____________?


a26 – 28°C

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b36 – 38°C

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c46 – 48°C

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d56 – 58°C

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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

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bFresh water fishes

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cBony fishes

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dNone of these

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View Answer Bony fishes

Which of the following statement about Homeostasis is incorrect?


aThere is a definite control system that regulates the homeostatic activities

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

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

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dAll are correct

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


aChange in membrane protein composition.

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

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cIncrease in proportion of unsaturated fatty acids.

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dDevelopment of heat shock proteins.

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


aFailure of bone marrow is accompanied with renal failure.

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bDestruction of RBC results from accumulated urea in the blood.

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cChronicity of the disease is respobsible for anemia

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

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


aGlucose

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bAmino acids

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cNitrogenous waste

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dAll of these

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View Answer Nitrogenous waste

Protonephridia are present in____________?


aRound worms

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bFlateworm

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cTape worms

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dSegmented worms

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View Answer Flateworm

Aquatic animals excrete nitrogenous waste commonly in the form of_____________?


aAmmonia

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bUrea

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cUric acid

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dTrimethylamine oxide

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View Answer Ammonia

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


aThey don’t require water for their metabolic process

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

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

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dThey are anhydrobiotic organisms

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