Osmoregulation is the regulation of water and salt content of the body. There are two extreme patterns of responses of an organism to the osmotic condition of the environment. Animals that are osmotically labile change the osmolarity of body fluids according to the osmolarity of the surrounding medium. They are called osmoconformers or Poikilosmotics. Animals that are osmotically stable maintain an internal osmolarity different from the surrounding medium. They are called osmoregulator. So take the Osmoregulation quiz and increase your knowledge about osmoregulation.
1. Which one of the following is the only osmoconformer in vertebrates?
A. Rana
B. Protopterus
C. Hagfish
D. Petromyzon
2. The organism which maintains their internal osmolarity different from surrounding mediums are......
A. Osmoconformers
B. Osmoregulators
C. Osmotons
D. Heteroconformers
3. What is the osmolarity of human blood?
A. 100 mosm/lt.
B. 1000 mosm/lt.
C. 300 mosm/lt.
D. 50 mosm/lt.
4. What is the basic purpose of scales over the body of fish?
A. Prevent the loss of water
B. Protect the body from enemies
C. To give proper shape to the body
D. All of the above
5. Urine in the insect is.......
A. Hyposmotic
B. Dilute
C. Hyperosmotic
D. None of the above
6. The organisms highly intolerant to dilution of the external medium are.........
A. Euryhaline
B. Halohaline
C. Pseudohaline
D. Stenohaline
7. Hypotonic organisms are in constant danger of......
A. Hydration
B. Dehydration
C. Osmoregulation
D. Rehydration
8. Protozoans eliminate the excess of water by.......
A. Food vacuole
B. Gas vacuole
C. Tactile vacuole
D. Contractile vacuole
9. Gills in Marine Bony fish preferably eliminate......
A. Monovalent ions
B. Trivalent ions
C. Divalent ions
D. Tetravalent ions
10. When marine Lampreys enter freshwater this stops drinking but if a return to brackish water, they......
A. Drink water
B. Extraction of Na+ and Cl- get activated
C. Both of these
D. None of these
11. In the freshwater fishes, the gill membrane has a special cell to import ions from the surrounding water......
A. Ionocytes
B. Chloride cells
C. Both of these
D. None of these
12. Insensible loss of water occurs through......
A. Perspiration
B. Urine elimination
C. In defaecation
D. Evaporation from respiratory surface
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