Medical entry test MCQs Biology Topic Homeostasis and excretion

These Questions/MCQs are from Biology 2nd year topic of Homeostasis and Excretion. Designed specially for Medical Entry Test particullarly MCAT. Leave your answers below or ask about a MCQ with a Question no and a link to test.

Biology Test Chapter 15 Homeostasis and Excretion :

1. The mechanism by which organisms maintain the stability of their cellular environment is known as;
a. Homeostasis
b. Normal health
c. Structural adaption
d. Osmoregulation

2. When the concentration of external medium is equal to the concentration of internal medium of cell is called;
a. Hypertonic
b. Hypotonic

c. Isotonic
d. Heterotonic

3. Brassica and rose plant belong to group of plants;
a. Hydrophytes
b. Mesophytes
c. Xerophytes
d. Succulents

4. Animals which are unable to adjust their internal salt concentration according to external environment is;
a. Anhydrobiosis
b. Osmoregulators
c. Thermoregulatory
d. Osmoconformers

5. Which one of the following animal can survive without drinking water?
a. Kangaroo rat
b. Pig
c. Kangaroo
d. Camel

6. Nitrogeneous wastes are produced as a result of;
a. Photosynthesis
b. Ingestion

c. Assimilation
d. Deamination

7. Fresh water protozoans pumped out excess water by a special structure called;
a. Oral groove
b. Contractile vacuole
c. Pellicle
d. Vacuole

8. The term glycogenesis means, the conversion of;
a. glucose to Glycogen
b. Lactic acid to Glycogen
c. Glycogen to Glucose
d. Amino acid to Glycogen

9. Which one of the following nitrogenous compound is much more soluble in water?
a. Uric acid
b. Urea
c. Ammonia
d. Creatine

10. The removal of amino group from amino acid is called;
a. Transamination
b. Deamination
c. Translocation
d. Transposition

11. The amount of water required for the removal of 2 g of ammonia is;
a. 200 ml
b. 500 ml
c. 100 ml
d. 1000 ml

12. In flatworms excretory system consists of a net work of closed tubules with out internal openings are called;
a. Nephridia
b. Protonephridia
c. Metanephridia
d. Nephrostome

13. According to the removal of nitrogenous wastes, reptiles and birds are the examples of;
a. Uricotelic
b. Ammonotelic
c. Ureotelic
d. Ammoniotelic

14. The functional unit of human kidney is called;
a. Nephridia
b. Collecting tubule
c. Nephron
d. Nephrotome

15. The end product of haemoglobin is the;
a. Allontoin
b. Bilirubin
c. Xanthine
d. Creatinine

16. All of the following are the plasma proteins synthesize by Liver, except that of;
a. Albumin
b. Prothrombin
c. Glycogen
d. Fibrinogen

17. Liver is a large organ, making the body weight  up to;
a. 2 -- 3 %
b. 3 -- 6 %
c. 1 -- 2 %
d. 3 -- 5 %

18. The term Glycogenolysis means, the conversion of;
a. Glucose into lactic acid
b. Glucose into Glycogen
c. Glucose into alcohol
d. Glucose into amino acid

19. Liver store tke vitamins A, D, E & K, which are the mainly;
a. Fat soluble
b. Cold water soluble
c. Alcoholic soluble
d. Hot water soluble

20. As human kidney has less than one percent of total body weight and with each cardiac cycle it receive the bllod of about;
a. 50 %
b. 30 %
c. 20 %
d. 25 %

21. Creatinine is produced  in;
a. Liver
b. Muscles
c. Kidney
d. Blood

22. All are related to urea cycle, except that of;
a. Citruline
b. Ornithene
c. Arginine
d. Creatinine

23. Urea leaves the kidney through;
a. Ureter
b. Urinary bladder
c. Urethra
d. pelvis

24. Urea is produced by a cyclic process in the liver known as;
a. Urea or Ornithene cycle
b. Urea or Citruline cycle
c. Urea or Arginine cycle
d. Both a & b

25. In man the expulsion of urine from the body the urethra is known as;
a. Urination
b. Elimination
c. Micturition
d. Filtration

26. Each nephron has a mass of blood capillaries which are partially enclosed by the blind ending region of the tubule is called;
a. Glomerulus
b. Bowman's capsule
c. Loop of henle
d. Vasa recta

27. The inner layer of the Bowman's capsule is made up o un-usual cells called;
a. Endothelial cells
b. Baesment membrane cells
c. Ciliated cells
d. Podocytes

28. the blood pressure in kidneys is higher that in the other organs this high pressure is maintained because;
a. The afferent arteriole has a large diameter and efferent arteriole has a smaller diameter
b. Of the foot like process of Podocytes
c. Because of the Bowman's capsule
c. The efferent arreriole has a large diameter than the afferent arteriole

29. Marine mammal such as whale has a very thick layer of isulating fat called blubber just under the skin, which one of the is not related to the adaptive value of this fat?
a. Because it is insoluble in water, so does not affect the osmotic balance of the cells
b. As fat is an energy storing compound, so it is utilized by the animal when storage of food
c. Fat has low energy contents as compared to other energy storing compound such as glycogen
d. Fat ha an insulating function  and having low heat conductivity

30. Which part of the Nephron maintains the normal pH of human blood?
a. Bowman's capsule
b. Ascending prtion of henle loop
c. Descending portion of henle loop
d. Collecting duct

31. Which one the following properties of water is the main contributory factor enabling homeotherms to adapt, to a range of environment?
a. Water has a high heat of vaporization
b. Water has high surface tension
c. Water has maximum density at 4 Co
d. It has a low viscocity

32. Which of the following is a function of the lever?
a. Regulation of plasma bicarbonate ions
b. Storage of vitamin C
c. Production of plasma albumin
d. Production granulocytes

33. Which of the following is an endothermic?
a. Humming birds
b. Bat
c. Fish
d. Birds

34. Human maintains their high body temperature with in a narrow range of about;
a. 36 -- 38 oC
b. 35 -- 37 oC
c. 37 -- 38 oC
d. 37 -- 39 oC

35. In human being body temperature is regulated by a part of brain; the
a. Thalamus
b. Hypothalamus
c. Medulla oblongata
d. Cerebellum

36. Process of reabsorption is the movement of materials from;
a. Filtrate to Glomerulus
b. Filtrate to blood capillaries
c. Glomerulus to filtrate
d. Pelvis to filtrate

37. Which of the following chemicals displaces the set point of the hypothalamus?
a. Antigen
b. Antibodies
c. Antibiotics
d. Pyrogen

38. The most common kidney stone is;
a. Calcium stone
b. Oxalate stone
c. Uric acid stone
d. Carbonate stone

39. The nitrogenous excretory compounds formed in Earth-worm are the;
a. Urea
b. Ammonia
c. Both a & b
d. Uric acid


  1. 1a 2c 3a 4c 5d 6b 7b 8c 9b 10c 11d 12a 13a 14c 15 16 17 18 19 20

  2. Replies
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