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Entry Test MCQ :: Homeostasis


1.  The mechanism of regulation, generally between organism and its environment, of solutes and the gain and the loss of water is called
A. Homeostasis B. Hemostasis
C. Osmoregualtion D. Thermoregulation

2.  Which of the following statement about Homeostasis is incorrect
A. There is a definite control system that regulates the homeostatic activities B. Homeostatic mechanisms keep the internal environment fixed despite of wide changes in external environment
C. Because of this the fluctuations of internal environment are of extremely narrow range as compared to that of external environment D. All are correct

3.  In a hot summer after noon, if your body's Homeostatic machinery keep your internal temperature quite lower than that of external than this is an example of
A. Positive feed back B. Negative feed back
C. Feed back D. Osmoregulation

4.  In osmosis water molecules move from area of _______ to _______ through semipermeable memberane
A. Higher solute concentration to lower solute concentration B. Lower solute concentration to higher solute concentration
C. Lower solvent concentration to higher solvent concentration D. All of these

5.  Which of the following represents osmoregulatory steps taken by hydrophytes?
A. Increases transpiration by increasing the surface area of the leave. B. Small and thick leaves to decrease the surface area proportional to the volume of the leave.
C. Stomata closing in sufficient supply, and opening in restricted supply of water. D. None of these

6.  Thick, waxy & leathery cuticle around leaves is present in
A. Hydrophytes B. Mesophytes
C. Xerophytes D. Halophytes

7.  Rose is an example of
A. Hydrophytes B. Mesophytes
C. Xerophytes D. Halophytes

8.  Most of the marine invertebrates are
A. Osmoconformers B. Osmoregulators
C. Both depend upon the concentration of sea water D. None of these

9.  Which of the following fish drink large amount of sea water and excrete concentrated urine resulting in maximum salt excretion and minimal water loss?
A. Hagfish B. Fresh water fishes
C. Bony fishes D. None of these

10.  Marine fish can keep their internal environment hypertonic with respect to the surrounding salty water by retaining.
A. Excessive urea which will increase their internal solute concentration and prevent body shrinkage in hypertonic environment B. Trimethyl alanine
C. Ammonia D. Trimethylamine oxide




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