Question:
Assertion (A): Physiological uremia is seen in cartilaginous fishes.
Reason (R): Urea is formed in liver via ornithine cycle.
Assertion (A): Physiological uremia is seen in cartilaginous fishes.
Reason (R): Urea is formed in liver via ornithine cycle.
Show Hint
Cartilaginous fishes keep their internal osmolarity close to seawater by hoarding urea!
Updated On: Jun 10, 2026
- Both (A) and (R) are true. (R) is the correct explanation for (A)
- Both (A) and (R) are true. (R) is not the correct explanation for (A)
- (A) is true. But (R) is false
- (A) is false. But (R) is true
Show Solution
Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Step 1: Concept
Osmoregulation in cartilaginous fishes (like sharks) involves urea retention.
Step 2: Analysis
Assertion (A) is true: Cartilaginous fishes retain high concentrations of urea in their blood to maintain osmotic balance with seawater, a condition termed physiological uremia. Reason (R) is true: Urea is indeed synthesized in the liver via the ornithine cycle.
Step 3: Conclusion
While both statements are true, the reason explains the *source* of the urea, not the specific physiological mechanism or adaptation leading to the uremic state in these fish.
Final Answer: (B)
Osmoregulation in cartilaginous fishes (like sharks) involves urea retention.
Step 2: Analysis
Assertion (A) is true: Cartilaginous fishes retain high concentrations of urea in their blood to maintain osmotic balance with seawater, a condition termed physiological uremia. Reason (R) is true: Urea is indeed synthesized in the liver via the ornithine cycle.
Step 3: Conclusion
While both statements are true, the reason explains the *source* of the urea, not the specific physiological mechanism or adaptation leading to the uremic state in these fish.
Final Answer: (B)
Was this answer helpful?
0
0
Top AP EAPCET Zoology Questions
- The incorrect statement for subspecies
- The equation which explains relation of species–area on logarithmic scale
- Life span of blood platelets is
- Assertion (A): The activated osteoblasts start deposition of mineral material to join fractured bone.
Reason (R): The major part of inorganic matter of bone is collagen. - Choose the correct statement among the following
View More Questions
Top AP EAPCET Human Excretory System Questions
- Function of aldosterone is
- pH of urine
Match the following:
Column I Column II A. Glomerulus i. Essential nutrients, 70–80% water and electrolytes are reabsorbed B. DCT ii. Maintenance of osmolality C. PCT iii. Filtration of blood D. Henle’s loop iv. Secretion of H+ and K+ ions - Match the following: A) ADH - I. Vasodilation B) Aldosterone - II. Converts angiotensinogen into angiotensin-I C) Renin - III. Increases water reabsorption D) ANF - IV. Increases $Na^+$ reabsorption
- Match the following:
Top AP EAPCET Questions
- A body is projected from the ground at an angle of $\tan^{-1} \left( \frac{8}{7}\right)$ with the horizontal. The ratio of the maximum height attained by it to its range is
- The four quantum numbers of the valence electron of potassium are :
- A lens forms real and virtual images of an object, when the object is at $u_{1}$ and $u_{2}$ distances respectively. If the size of the virtual image is double that of the real image, then the focal length of the lens is (take, the magnification of the real image as $m$ )
- Two spheres $P$ and $Q$, each of mass $200\, g$ are attached to a string of length one metre as shown in the figure. The string and the spheres are then whirled in a horizontal circle about $O$ at a constant angular speed. The ratio of the tension in the string between $P$ and $Q$ to that of between $P$ and $O$ is $(P$ is at mid-point of the line joining $O$ and $Q$ )
- The volume of $0.02\, M$ acidified permanganate solution required for complete reaction of $60\, mL$ of $0.01\, MI^{-}$ ion solution to form $I_2$ in $mL$ is
View More Questions