Question

Select the correct match with reference to excretion.

• A. Ornithine cycle - uric acid synthesis
• B. Camel - uricotelic animal
• C. Low threshold substance - glucose
• D. High threshold substance - amino acids

Hint:

Remember that the threshold of a substance is the point at which it can no longer be reabsorbed by the kidneys and is excreted in the urine.

Answer 1

The Correct Option is D

Step 1: Understanding the question.
The question asks for the correct match of terms related to excretion, focusing on the threshold of substances.
Step 2: Analyzing the options.
(A) Ornithine cycle - uric acid synthesis: The ornithine cycle does not directly correlate with uric acid synthesis; it is involved in the urea cycle.
(B) Camel - uricotelic animal: Camels are not uricotelic (excreting uric acid). They are ureotelic, excreting urea to conserve water.
(C) Low threshold substance - glucose: This is incorrect because glucose is not a low-threshold substance. Its threshold is typically high.
(D) High threshold substance - amino acids: Correct — Amino acids are typically high threshold substances as they are reabsorbed in the kidneys until a certain threshold is surpassed.
Step 3: Conclusion.
The correct answer is (D) High threshold substance - amino acids, as amino acids are reabsorbed until a certain concentration is reached.