Chapter 22: Chemical Coordination and Integration – Case-Based / Source-Based Questions with Answers
CBSE Class 11 Biology Case-Based Questions – Chemical Coordination and Integration (NCERT)
Course & Examination Details
- Course: CBSE Class 11 Biology
- Prescribed By: Central Board of Secondary Education
- Based On: NCERT
- Unit: Unit V – Human Physiology
- Chapter: Chapter 22 – Chemical Coordination and Integration
- Question Type: Case-Based / Source-Based Questions
- Exam Relevance: CBSE Class 11 Annual Exam, Unit Tests, Competency-Based Assessments
Section A: Endocrine Glands (Case 1–9)
Case 1
A student learns that some glands release chemicals directly into blood without ducts.
Q1. Identify the type of glands described.
Answer:
These are endocrine glands, which secrete hormones directly into the bloodstream.
Case 2
A diagram shows a small gland at the base of the brain controlling other glands.
Q2. Name this gland.
Answer:
The pituitary gland.
Case 3
A patient shows reduced activity of thyroid due to lack of iodine.
Q3. Which disorder may develop?
Answer:
Goitre may develop due to iodine deficiency.
Case 4
A doctor explains that a gland connects the nervous system with the endocrine system.
Q4. Identify this gland.
Answer:
The hypothalamus connects the nervous and endocrine systems.
Case 5
A person has disturbed sleep–wake cycle.
Q5. Which hormone is responsible for regulating this cycle?
Answer:
Melatonin regulates the sleep–wake (circadian) rhythm.
Case 6
An emergency situation causes rapid increase in heart rate and blood pressure.
Q6. Name the hormone responsible.
Answer:
Adrenaline is responsible for this response.
Case 7
A gland shows two distinct regions – cortex and medulla.
Q7. Identify the gland.
Answer:
The adrenal gland.
Case 8
A child shows abnormal growth due to imbalance of a pituitary hormone.
Q8. Name the hormone involved.
Answer:
Growth hormone.
Case 9
A patient has low blood calcium level and muscle spasms.
Q9. Which gland may be under-secreting?
Answer:
The parathyroid gland.
Section B: Hormones & Their Action (Case 10–17)
Case 10
A hormone acts only on cells having specific receptors.
Q10. What property of hormones is illustrated here?
Answer:
Hormone specificity.
Case 11
A hormone cannot enter the cell and acts via cAMP.
Q11. Identify the type of hormone.
Answer:
It is a water-soluble hormone.
Case 12
A hormone enters the cell and directly affects gene expression.
Q12. Which class of hormone shows this action?
Answer:
Lipid-soluble (steroid) hormones.
Case 13
Two pancreatic hormones work in opposite manner to regulate blood glucose.
Q13. Name these hormones.
Answer:
Insulin and glucagon.
Case 14
A hormone increases basal metabolic rate of the body.
Q14. Name the hormone.
Answer:
Thyroxine.
Case 15
Excess hormone level inhibits further secretion from the gland.
Q15. What regulatory mechanism is shown?
Answer:
Negative feedback regulation.
Case 16
A hormone deficiency causes excessive urination and thirst.
Q16. Identify the hormone.
Answer:
Antidiuretic hormone (ADH).
Case 17
A gland secretes hormones affecting secondary sexual characters in males.
Q17. Name the hormone.
Answer:
Testosterone.
Section C: Hormonal Disorders (Case 18–25)
Case 18
A patient has persistently high blood glucose and glucose in urine.
Q18. Identify the disorder.
Answer:
Diabetes mellitus.
Case 19
A child shows stunted growth due to hormone deficiency during development.
Q19. Name the disorder.
Answer:
Dwarfism.
Case 20
An adult shows enlarged hands and facial bones.
Q20. Identify the condition.
Answer:
Acromegaly.
Case 21
A patient has excessive cortisol levels causing obesity and muscle weakness.
Q21. Name the disorder.
Answer:
Cushing’s syndrome.
Case 22
A patient shows weight loss, fatigue, and low blood pressure due to adrenal failure.
Q22. Identify the disease.
Answer:
Addison’s disease.
Case 23
A child suffers from mental retardation and stunted growth due to thyroid deficiency.
Q23. Name the disorder.
Answer:
Cretinism.
Case 24
An adult shows swelling and reduced metabolic rate due to thyroid dysfunction.
Q24. Identify the condition.
Answer:
Myxedema.
Case 25
A patient shows involuntary muscle contractions due to low calcium.
Q25. Name the disorder.
Answer:
Tetany.
NCERT & CBSE Compliance Note
✔ Strictly based on NCERT Class 11 Biology
✔ Competency-based, application-oriented questions
✔ Fully aligned with CBSE board assessment pattern
✔ Ideal for board exams and internal assessments