Question

Which of the following statements about osmoregulation are NOT true?

Select one:

a. Osmoregulators can control their internal osmolarity independent of external environment and thus maintain a constant osmotic pressure in the blood

b. Marine fish lose more water from the gills and body surface and excrete less water from the kidneys

c. Freshwater fish lose more water from the gills and body surface and excrete less water from the kidneys

d. Marine birds have a transport epithelium process that can move salt from the blood into secretory tubules and out of the nostrils

Answer 1

Which of the following statements about osmoregulation are NOT true? Select one: a. Osmoregulators can control their internal osmolarity independent of external environment and thus maintain a constant osmotic pressure in the blood b. Marine fish lose more water from the gills and body surface and excrete less water from the kidneys Freshwater fish lose more water from the gills and body surface and excrete less water from the kidneys d. Marine birds have a transport epithelium process that can move salt from the blood into secretory tubules and out of the nostrils

The option (c) is FALSE because,

Since freshwater fishes have higher salt concentration than their surrounding environment, they tend to take more water through their gills and body surface, and release more ions from their body surface. In addition, they secrete dilute urine, having large volume of water to get rid of water taken in during osmoregulation.