Chapter 22: Chemical Coordination

NCERT Solutions for CBSE Class 10 Biology — 29 solved questions with detailed explanations.

Questions

Topics

Solved Questions

Q1. Insulin is secreted by:

α-cells of islets of Langerhans
β-cells of islets of Langerhans
Acinar cells
Chief cells

Difficulty: Easy · Topic: Hormones

Solution

β-cells of pancreatic islets secrete insulin, which lowers blood glucose by promoting glucose uptake and glycogenesis.

Q2. Hypothyroidism in children leads to:

Gigantism
Cretinism
Acromegaly
Diabetes

Difficulty: Easy · Topic: Thyroid

Solution

Cretinism: stunted growth, mental retardation due to thyroid hormone deficiency in childhood.

Q3. The fight-or-flight response is mediated by:

Thyroid hormones
Adrenaline (epinephrine)
Insulin
Melatonin

Difficulty: Easy · Topic: Adrenal Glands

Solution

Adrenaline from adrenal medulla triggers fight-or-flight: increased heart rate, blood pressure, glucose release.

Q4. TSH is secreted by:

posterior pituitary
hypothalamus
anterior pituitary
thyroid

Difficulty: Easy · Topic: Chemical Coordination

Solution

anterior pituitary.

Q5. Oxytocin is stored in:

hypothalamus only
ovary
posterior pituitary
anterior pituitary

Difficulty: Easy · Topic: Chemical Coordination

Solution

posterior pituitary.

Q6. Glucagon is secreted by:

Pituitary
Thyroid
Adrenal
Pancreas (α cells)

Difficulty: Easy · Topic: Hormones

Solution

Glucagon is produced by Pancreas (α cells).

Q7. Thyroxine (T4) is secreted by:

Pancreas
Pituitary
Thyroid gland
Adrenal

Difficulty: Easy · Topic: Hormones

Solution

Thyroxine (T4) is produced by Thyroid gland.

Q8. Adrenaline is secreted by:

Pituitary
Thyroid
Adrenal medulla
Pancreas

Difficulty: Easy · Topic: Hormones

Solution

Adrenaline is produced by Adrenal medulla.

Q9. Cortisol is secreted by:

Thyroid
Adrenal cortex
Pituitary
Pancreas

Difficulty: Easy · Topic: Hormones

Solution

Cortisol is produced by Adrenal cortex.

Q10. ADH (Vasopressin) is secreted by:

Thyroid
Posterior pituitary
Anterior pituitary
Kidney

Difficulty: Easy · Topic: Hormones

Solution

ADH (Vasopressin) is produced by Posterior pituitary.

Q11. Oxytocin is secreted by:

Posterior pituitary
Uterus
Anterior pituitary
Ovary

Difficulty: Easy · Topic: Hormones

Solution

Oxytocin is produced by Posterior pituitary.

Q12. FSH is secreted by:

Posterior pituitary
Testis
Ovary
Anterior pituitary

Difficulty: Easy · Topic: Hormones

Solution

FSH is produced by Anterior pituitary.

Q13. LH is secreted by:

Ovary
Testis
Posterior pituitary
Anterior pituitary

Difficulty: Easy · Topic: Hormones

Solution

LH is produced by Anterior pituitary.

Q14. Estrogen is secreted by:

Testis
Ovary
Adrenal
Pituitary

Difficulty: Easy · Topic: Hormones

Solution

Estrogen is produced by Ovary.

Q15. Testosterone is secreted by:

Adrenal
Testis (Leydig cells)
Ovary
Pituitary

Difficulty: Easy · Topic: Hormones

Solution

Testosterone is produced by Testis (Leydig cells).

Q16. Progesterone is secreted by:

Pituitary
Thyroid
Testis
Corpus luteum/Placenta

Difficulty: Easy · Topic: Hormones

Solution

Progesterone is produced by Corpus luteum/Placenta.

Q17. Melatonin is secreted by:

Thyroid
Pineal gland
Adrenal
Pituitary

Difficulty: Easy · Topic: Hormones

Solution

Melatonin is produced by Pineal gland.

Q18. Parathyroid hormone is secreted by:

Adrenal
Thyroid
Pituitary
Parathyroid gland

Difficulty: Easy · Topic: Hormones

Solution

Parathyroid hormone is produced by Parathyroid gland.

Q19. Calcitonin is secreted by:

Parathyroid
Pituitary
Adrenal
Thyroid (C cells)

Difficulty: Easy · Topic: Hormones

Solution

Calcitonin is produced by Thyroid (C cells).

Q20. Aldosterone is secreted by:

Thyroid
Pituitary
Adrenal cortex
Kidney

Difficulty: Easy · Topic: Hormones

Solution

Aldosterone is produced by Adrenal cortex.

Q21. Erythropoietin is secreted by:

Bone marrow
Kidney
Liver
Spleen

Difficulty: Easy · Topic: Hormones

Solution

Erythropoietin is produced by Kidney.

Q22. Atrial natriuretic factor is secreted by:

Pituitary
Liver
Heart (atria)
Kidney

Difficulty: Easy · Topic: Hormones

Solution

Atrial natriuretic factor is produced by Heart (atria).

Q23. Thymosin is secreted by:

Thyroid
Pituitary
Spleen
Thymus

Difficulty: Easy · Topic: Hormones

Solution

Thymosin is produced by Thymus.

Q24. Growth hormone is secreted by:

posterior pituitary
thyroid
anterior pituitary
adrenal

Difficulty: Easy-Medium · Topic: Chemical Coordination

Solution

anterior pituitary.

Q25. Thyroxine (T4) contains:

zinc
calcium
iron
iodine

Difficulty: Easy-Medium · Topic: Chemical Coordination

Solution

iodine.

Q26. Diabetes mellitus is caused by deficiency of:

insulin
glucagon
thyroxine
adrenaline

Difficulty: Easy-Medium · Topic: Chemical Coordination

Solution

insulin.

Q27. Addison's disease is due to:

pituitary excess
hypersecretion
hyposecretion of adrenal cortex hormones
thyroid deficiency

Difficulty: Easy-Medium · Topic: Chemical Coordination

Solution

hyposecretion of adrenal cortex hormones.

Q28. Gigantism is caused by:

excess GH in childhood
deficient GH
deficient insulin
excess thyroxine

Difficulty: Easy-Medium · Topic: Chemical Coordination

Solution

excess GH in childhood.

Q29. Dwarfism is caused by:

excess thyroxine
deficient GH in childhood
excess GH
deficient insulin

Difficulty: Easy-Medium · Topic: Chemical Coordination

Solution

deficient GH in childhood.

Other Chapters in Biology

Ch 1: The Living World Ch 2: Biological Classification Ch 3: Plant Kingdom Ch 4: Animal Kingdom Ch 5: Morphology of Plants Ch 6: Anatomy of Plants Ch 7: Structural Organisation in Animals Ch 8: Cell Unit of Life Ch 9: Biomolecules Ch 10: Cell Cycle Ch 11: Transport in Plants Ch 12: Mineral Nutrition Ch 13: Photosynthesis Ch 14: Respiration in Plants Ch 15: Plant Growth Ch 16: Digestion & Absorption Ch 17: Breathing & Gas Exchange Ch 18: Body Fluids & Circulation Ch 19: Excretory Products Ch 20: Locomotion & Movement Ch 21: Neural Control

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