#1
Which organ is primarily responsible for osmoregulation in freshwater fish?
Kidneys
ExplanationKidneys regulate water and ion balance in freshwater fish.
#2
What is the process by which marine animals maintain proper salt concentrations within their bodies?
Osmoregulation
ExplanationOsmoregulation ensures salt balance in marine animals.
#3
In which environment would you expect to find a higher concentration of urea in the body fluids of an animal?
Saltwater
ExplanationAnimals in saltwater environments have higher urea concentrations.
#4
Which hormone plays a crucial role in regulating water balance in mammals by increasing water reabsorption in the kidneys?
Antidiuretic hormone (ADH)
ExplanationADH enhances water reabsorption in mammalian kidneys.
#5
Which of the following is a characteristic of osmoconformers?
They adjust their internal osmolarity to match the external environment
ExplanationOsmoconformers match internal osmolarity to external conditions.
#6
What is the primary function of the rectal gland in elasmobranchs such as sharks and rays?
Salt excretion
ExplanationRectal gland aids salt excretion in elasmobranchs.
#7
Which ion plays a crucial role in the regulation of osmotic balance in plants?
Potassium (K+)
ExplanationPotassium regulates osmotic balance in plant cells.
#8
What is the term for the process by which marine birds and reptiles excrete excess salt accumulated from their diets?
Salt excretion
ExplanationSalt excretion removes excess salt in marine birds and reptiles.
#9
Which of the following animals is known for its ability to survive extreme dehydration by entering a state of suspended animation?
Kangaroo rat
ExplanationKangaroo rat survives dehydration via suspended animation.