Homeostasis Mcqs

This Set of Multiple choice questions and answers focuses on study of Homeostasis in Biology. These questions are chosen from a collection of most authoritative and best reference books on Biology. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, MDCAT, Teaching jobs Tests and Medicine industry job interviews. One should practice our Mcqs to assimilate knowledge on Homeostasis comprehensively.

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1.
The mechanism of regulation, generally between organism and its environment, of solutes and the gain and the loss of water is called

Homeostasis

Hemostasis

Osmoregualtion

Thermoregulation

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2.
Which of the following statement about Homeostasis is incorrect

There is a definite control system that regulates the homeostatic activities

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

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

All are correct

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3.
In osmosis water molecules move from area of _______ to _______ through semipermeable memberane

Higher solute concentration to lower solute concentration

Lower solute concentration to higher solute concentration

Lower solvent concentration to higher solvent concentration

All of these

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4.
Which of the following represents osmoregulatory steps taken by hydrophytes?

Increases transpiration by increasing the surface area of the leave.

Small and thick leaves to decrease the surface area proportional to the volume of the leave.

Stomata closing in sufficient supply, and opening in restricted supply of water.

None of these

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5.
Thick, waxy & leathery cuticle around leaves is present in

Hydrophytes

Mesophytes

Xerophytes

Halophytes

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7.
Most of the marine invertebrates are

Osmoconformers

Osmoregulators

Both depend upon the concentration of sea water

None of these

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8.
Which of the following fish drink large amount of sea water and excrete concentrated urine resulting in maximum salt excretion and minimal water loss?

Hagfish

Fresh water fishes

Bony fishes

None of these

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9.
Marine fish can keep their internal environment hypertonic with respect to the surrounding salty water by retaining.

Excessive urea which will increase their internal solute concentration and prevent body shrinkage in hypertonic environment

Trimethyl alanine

Ammonia

Trimethylamine oxide

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10.
Which of the following marine fishes are considered direct descendents of fresh water ancestors?

Hagfish

Jelly Fish

Star Fish

Bony fishes

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11.
Which of the following fishes excrete large volume of diluted urine?

Bony Marine fishes

Fresh water fishes

Both depending upon the surrounding water

None of these

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12.
The characteristic which enable animals to tolerate dehydration is called

Osmoconformation

Osmoregulaton

Anhydrobiosis

Anhydrosis

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14.
In plants which of the following is a waste product produced both during photosynthesis and respiration

CO2

H2O

O2

Both A and B

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15.
Which of the following statement about conifers is correct?

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

Accumulate waste in leaves, which fall in autumn.

Production of black wood in the center.

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

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