Biology MCQs Online Quiz Test 42

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MCAT Biology MCQs With Answers For Entry Tests

Q.1: Which adaptation is acquired by plants of cooler areas to prevent lipid crystal formation in cell membrane?

  1. Change in membrane protein composition.
  2. Change in the solute composition of the cell membrane which prevents crystallization.
  3. Increase in proportion of unsaturated fatty acids.
  4. Development of heat shock proteins.

C

Q.2: Which of the following statement about Homeostasis is incorrect?

  1. There is a definite control system that regulates the homeostatic activities
  2. Homeostatic mechanisms keep the internal environment fixed despite of wide changes in external environment
  3. Because of this the fluctuations of internal environment are of extremely narrow range as compared to that of external environment
  4. All are correct

B

Q.3: Which of the following fish drink large amount of sea water and excrete concentrated urine resulting in maximum salt excretion and minimal water loss?

  1. Hagfish
  2. Fresh water fishes
  3. Bony fishes
  4. None of these

C

Q.4: Normal body temperature in mamals like human beings is——?

  1. 26 – 28°C
  2. 36 – 38°C
  3. 46 – 48°C
  4. 56 – 58°C

B

Q.5: In osmosis water molecules move from area of ——- through semipermeable memberane?

  1. Higher solute concentration to lower solute concentration
  2. Lower solute concentration to higher solute concentration
  3. Lower solvent concentration to higher solvent concentration
  4. All of these

B

Q.6: Which of the following is most toxic?

  1. Ammonia
  2. Urea
  3. Uric acid
  4. Trimethylamine oxide

A

Q.7: Blubber a thick layer of fat is present in——?

  1. Fresh water mammals
  2. Terrestrial mammals
  3. Marine Mammals
  4. Flying mammals

C

Q.8: Production of pyrogens is a —– phenomenon?

  1. Protective
  2. Destructive
  3. Constructive
  4. Aggressive

A

Q.9: Thermostat of human body is present in—–?

  1. Fore brain
  2. Hind Brain
  3. Thalamus
  4. Hypothalamus

D

Q.10: Which of the following structure in plant’s body is called excretophores?

  1. Stem
  2. Leaves
  3. Flowers
  4. Roots

B