Question

Dwarfism in childhood, such as Frohlich and Lorain dwarfs in humans, develop due to ......................

• A. hyposecretion of somatotropin
• B. hyposecretion of thyrotropin
• C. hypersecretion of thymosin
• D. hypersecretion of secretin

Hint:

Hyposecretion of somatotropin (growth hormone) in children leads to growth disorders such as dwarfism.

Answer 1

The Correct Option is A

Step 1: Understanding dwarfism.
Dwarfism in humans can result from a variety of endocrine disorders. Frohlich and Lorain dwarfs have a deficiency in somatotropin (growth hormone), leading to stunted growth. This condition results from hyposecretion of somatotropin.
Step 2: Analyzing the options.
(A) hyposecretion of somatotropin: Correct — A deficiency of somatotropin causes growth retardation, resulting in dwarfism.
(B) hyposecretion of thyrotropin: Incorrect — Thyrotropin regulates thyroid function but does not directly cause dwarfism.
(C) hypersecretion of thymosin: Incorrect — Thymosin is related to immune function, not growth, and its hypersecretion does not cause dwarfism.
(D) hypersecretion of secretin: Incorrect — Secretin is involved in digestive processes, not growth, and its overproduction is not linked to dwarfism.
Step 3: Conclusion.
The correct answer is (A) hyposecretion of somatotropin, as it directly causes dwarfism in these conditions.