Thyroid & Parathyroid — NEET Biology MCQs with Solutions
Free NEET Biology Thyroid & Parathyroid MCQs with step-by-step solutions (6 questions). Part of Chemical Coordination and Integration. Practise online on Prepizo — no login needed.
▶ Practise Thyroid & Parathyroid online (free)
Questions with solutions
Q1 — Thyroid & Parathyroid · easy · theory
The thyroid hormones (T₃ and T₄) require the element ______ for their synthesis:
A. Sodium
B. Calcium
C. Iodine ✓ Correct
D. Iron
Solution: Iodine is essential for thyroxine (T₄) and triiodothyronine (T₃) synthesis.
Q2 — Thyroid & Parathyroid · easy · theory
Enlargement of the thyroid gland due to dietary iodine deficiency is called:
A. Goitre ✓ Correct
B. Cretinism
C. Diabetes
D. Tetany
Solution: Iodine deficiency → low thyroxine → thyroid enlarges (simple goitre).
Q3 — Thyroid & Parathyroid · medium · theory
Hyposecretion of thyroid hormones during pregnancy/childhood can cause ______ in the newborn:
A. Exophthalmic goitre
B. Acromegaly
C. Cretinism (stunted growth, mental retardation) ✓ Correct
D. Gigantism
Solution: Congenital hypothyroidism causes cretinism — stunted growth, low IQ, deaf-mutism.
Q4 — Thyroid & Parathyroid · medium · theory
The parathyroid hormone (PTH) raises blood calcium levels; it is therefore called a ______ hormone:
A. Hypercalcemic ✓ Correct
B. Hypocalcemic
C. Hypoglycemic
D. Hyperglycemic
Solution: PTH is hypercalcemic — it increases blood Ca²⁺ by acting on bone, kidney and gut (opposed by calcitonin).
Q5 — Thyroid & Parathyroid · hard · theory
Calcitonin (from the thyroid) and parathormone (from parathyroids) act antagonistically to regulate:
A. Blood pressure
B. Body temperature
C. Blood calcium levels ✓ Correct
D. Blood glucose levels
Solution: Calcitonin lowers and PTH raises blood Ca²⁺ — together they maintain calcium homeostasis.
Q6 — Thyroid & Parathyroid · hard · theory
Thyroxine is also a major regulator of the ______ and influences ______:
A. Basal metabolic rate (BMR); growth, RBC formation and tissue development ✓ Correct
B. Water balance; urine volume
C. Blood sugar; digestion only
D. Blood calcium; muscle contraction only
Solution: Thyroxine controls BMR and supports normal growth, erythropoiesis, and metabolism of carbohydrates, fats and proteins.