MCQs on Osmoregulation

The process by which osmotic pressure of the fluids is regulated creating an electrolytic balance in entities is referred to as osmoregulation. The two main types of osmoregulation are – osmoconformers and osmoregulators.

1. In Paramoecium, osmoregulation is a function of

(a) cytostome

(b) contractile vacuole

(c) cytopyge

(d) trichocysts

Answer: (b)

2. Osmoregulators carry out excretion of salt through

(a) gills

(b) fins

(c) scales

(d) bladder

Answer: (a)

3. Without restoration, if excess water passes out from the tissues of kidney, the cells would

(a) shrivel and die

(b) burst open and die

(c) not get affected at all

(d) take water from plasma

Answer: (c)

4. This is used as an osmolyte in humans to increase medullary interstitial osmolality during concentration of urine

(a) Urea

(b) TMAO

(c) (a) and (b) both

(d) Uric acid

Answer: (a)

5. A person on a long hunger strike, surviving only on water will have

(a) less amino acids in his urine

(b) more sodium in hir urine

(c) less urea in his urine

(d) more glucose in his blood

Answer: (c)

6. Mechanism of regulation, typically between entities and its environment of solutes and the loss and gain of water is known as

(a) Homeostasis

(b) Thermoregulation

(c) Hemostasis

(d) Osmoregulation

Answer: (d)

7. Most of the marine invertebrates are

(a) Osmoregulators

(b) Osmoconformers

(c) both depend on sea water concentration

(d) None of the above

Answer: (b)

8. Kidney matrix retains some quantity of urea to maintain

(a) metabolism

(b) micturition

(c) desired osmolarity

(d) balance of the body

Answer: (c)

9. This is not a primary function of protonephridia

(a) excretion

(b) osmoregulation

(c) fluid volume regulation

(d) ionic volume regulation

Answer: (a)

10.This is both osmoregulator and a nitrogenous product

(a) Uric acid

(b) Urea

(c) NH3

(d) All of the above

Answer: (b)

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