alleryWhich gland plays a major role in development of the immune system?
- Pineal
- Thyroid
- Thymus
- Adrenal
Show answer and solution
Correct answer: C. Thymus
The thymus secretes thymosins and plays a major role in the development of immunity.
CBSE Class 11 (Science) Neural Control and Chemical Coordination — practice questions — page 4
Explore 172 free Neural Control and Chemical Coordination questions in CBSE Class 11 (Science) Biology. Open each question or exercise to read its content, reference answers and available explanation.
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Which gland plays a major role in development of the immune system?Read the answer and worked solution →Thymosins promote differentiation of which cells?Read the answer and worked solution →Why do old persons have weaker immune responses?Read the answer and worked solution →Where is the thymus located?Read the answer and worked solution →The adrenal glands are located:Read the answer and worked solution →The centrally located tissue of the adrenal gland is the:Read the answer and worked solution →Underproduction of adrenal cortex hormones causes weakness, fatigue and:Read the answer and worked solution →Adrenaline and noradrenaline are together called:Read the answer and worked solution →Which hormones are known as hormones of fight or flight?Read the answer and worked solution →Which effect is NOT produced by adrenaline and noradrenaline?Read the answer and worked solution →Catecholamines raise blood glucose by stimulating the breakdown of:Read the answer and worked solution →Which is the inner layer of the adrenal cortex?Read the answer and worked solution →The main glucocorticoid in the human body is:Read the answer and worked solution →Which process do glucocorticoids stimulate?Read the answer and worked solution →Cortisol is known to produce which reaction and suppress immunity?Read the answer and worked solution →Aldosterone acts mainly at the renal tubules to stimulate reabsorption of:Read the answer and worked solution →Androgenic steroids from the adrenal cortex help growth of which feature at puberty?Read the answer and worked solution →The pancreas acts as which kind of gland?Read the answer and worked solution →Which cells of the islets secrete glucagon?Read the answer and worked solution →Glucagon acts mainly on which cells to raise blood sugar?Read the answer and worked solution →Insulin acts mainly on hepatocytes and which other cells?Read the answer and worked solution →Insulin lowers blood glucose partly by promoting conversion of glucose to:Read the answer and worked solution →Prolonged hyperglycemia leads to which disorder?Read the answer and worked solution →Diabetic patients are successfully treated with:Read the answer and worked solution →Leydig cells of the testis produce a group of hormones called:Read the answer and worked solution →Which feature is NOT stimulated by androgens?Read the answer and worked solution →The testis works as a primary sex organ and also as a(n):Read the answer and worked solution →The ovary produces how many ova during each menstrual cycle?Read the answer and worked solution →Which hormone, made by the atrial wall of the heart, lowers blood pressure?Read the answer and worked solution →Erythropoietin, which stimulates formation of RBCs, is produced by the:Read the answer and worked solution →
Worked practice questions
Thymosins promote differentiation of which cells?
- B-lymphocytes only
- Red blood cells
- Platelet formation
- T-lymphocytes
Show answer and solution
Correct answer: D. T-lymphocytes
Thymosins drive differentiation of T-lymphocytes, which give cell-mediated immunity.
Why do old persons have weaker immune responses?
- Thymus degenerates, so less thymosin
- The thyroid gland enlarges
- Pineal secretes more melatonin
- Adrenal medulla shrinks fast
Show answer and solution
Correct answer: A. Thymus degenerates, so less thymosin
Thymus degeneration with age lowers thymosin production, weakening immune responses.
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