Why bony fish have tendency to lose water to the external environment?
a) their bodies are hypertonic
b) their bodies are isotonic
c) their bodies are hypotonic
d) none of these
Marine teleosts lose water to environment especially across ………
a) gills epithelium
b) skin
c) eyes
Which of the following salt ions are removed across gills epithelium in marine teleosts (bony fish)?
a) Na+
b) Cl-
c) K+
d) all of these
Which of the following salt ions is removed through kidneys in marine teleosts (bony fish)?
a) Mg++
b) Ca++
c) K+
d) both a and b
Salt secreting gland in marine fish are found in
a) walls of stomach
b) wall of the rectum
c) gills epithelium
d) all of these
Explanation: these glands are called rectal glands
Rectal gland is a character of…….
a) fresh water fishes
b) marine water fishes
c) both a and b
d) none of these
