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| Human endocrine system showing major endocrine glands and hormonal coordination in the body. |
NEET-Level MCQs (Hard)
Chapter: Chemical Coordination and Integration
Class 11 Biology
MCQs
Q1. Which of the following statements regarding hormones is incorrect?
A. They are produced in trace amounts
B. They act as intercellular messengers
C. They are always proteins
D. They are transported through blood
✅ Answer: C. They are always proteins
📝 Explanation: Hormones may be proteins, peptides, steroids, or amino acid derivatives.
Q2. Endocrine glands differ from exocrine glands because endocrine glands:
A. Produce enzymes
B. Lack ducts
C. Release secretions into ducts
D. Are larger in size
✅ Answer: B. Lack ducts
Q3. Which of the following is NOT correctly matched?
A. Hormones — Chemical messengers
B. Endocrine gland — Ductless gland
C. Blood — Hormone transport medium
D. Neurons — Hormone-producing cells
✅ Answer: D. Neurons — Hormone-producing cells
Q4. Hormones can produce profound effects because they:
A. Are produced in large quantities
B. Are stored permanently
C. Act specifically on target cells with receptors
D. Are nutrient substances
✅ Answer: C. Act specifically on target cells with receptors
Q5. Which characteristic is common to both nervous and endocrine systems?
A. Both use electrical impulses
B. Both maintain coordination in the body
C. Both act only on muscles
D. Both have rapid effects only
✅ Answer: B. Both maintain coordination in the body
Q6. The modern definition of hormones includes chemicals produced:
A. Only by endocrine glands
B. Only by neurons
C. By organized endocrine glands and other tissues
D. Only in vertebrates
✅ Answer: C. By organized endocrine glands and other tissues
Q7. Which of the following correctly explains why endocrine coordination is slower than neural coordination?
A. Hormones travel through ducts
B. Hormones move through blood circulation
C. Hormones are nutrients
D. Hormones cannot bind receptors
✅ Answer: B. Hormones move through blood circulation
Q8. Invertebrates possess:
A. No hormones
B. Highly complex endocrine systems
C. Simple endocrine systems with few hormones
D. Only exocrine glands
✅ Answer: C. Simple endocrine systems with few hormones
Q9. Which statement is correct regarding target organs?
A. They secrete hormones
B. They contain specific receptors for hormones
C. They destroy hormones
D. They transport hormones
✅ Answer: B. They contain specific receptors for hormones
Q10. Neural coordination is termed “point-to-point” because:
A. Hormones act everywhere
B. Nerves connect specific organs or cells
C. Blood transports signals everywhere
D. It affects all tissues equally
✅ Answer: B. Nerves connect specific organs or cells
Assertion and Reason Type MCQs
Q11.
Assertion:
Hormones are effective even in minute quantities.
Reason:
Target cells possess specific receptors for hormones.
A. Both true, Reason correct explanation
B. Both true, Reason not correct explanation
C. Assertion true, Reason false
D. Assertion false, Reason true
✅ Answer: A
Q12.
Assertion:
Endocrine glands are richly supplied with blood vessels.
Reason:
Hormones must be transported rapidly into circulation.
A. Both true, Reason correct explanation
B. Both true, Reason not correct explanation
C. Assertion true, Reason false
D. Assertion false, Reason true
✅ Answer: A
Q13.
Assertion:
Neural coordination is long-lasting.
Reason:
Nerve impulses act rapidly.
A. Both true
B. Both false
C. Assertion false, Reason true
D. Assertion true, Reason false
✅ Answer: C
Statement-Based MCQs
Q14. Select the correct statements:
- Hormones are non-nutrient chemicals.
- Hormones are produced in trace amounts.
- All cells respond equally to hormones.
- Hormones act through receptors.
A. 1 and 2 only
B. 1, 2 and 4 only
C. 2 and 3 only
D. 1, 3 and 4 only
✅ Answer: B
Q15. Which of the following statements are true regarding endocrine glands?
- They are ductless.
- They release hormones into blood.
- They contain target receptors.
- They regulate body functions.
A. 1 and 2 only
B. 1, 2 and 4 only
C. 2, 3 and 4 only
D. All of these
✅ Answer: B
Match the Following Type MCQ
Q16.
| Column I | Column II |
|---|---|
| a. Hormones | i. Ductless glands |
| b. Endocrine glands | ii. Chemical messengers |
| c. Blood | iii. Transport medium |
| d. Target organ | iv. Specific receptors |
A. a-ii, b-i, c-iii, d-iv
B. a-i, b-ii, c-iii, d-iv
C. a-iii, b-i, c-ii, d-iv
D. a-ii, b-iii, c-i, d-iv
✅ Answer: A
NEET Conceptual MCQs
Q17. Why can hormones regulate organs far away from their site of secretion?
A. Hormones diffuse through nerves
B. Hormones are transported through blood circulation
C. Hormones move through ducts
D. Hormones are stored in muscles
✅ Answer: B
Q18. Which of the following is NOT a property of endocrine coordination?
A. Long-lasting effect
B. Slow response
C. Highly localized rapid action
D. Regulation through hormones
✅ Answer: C
Q19. The endocrine system and nervous system together help in:
A. Digestion only
B. Reproduction only
C. Coordination and regulation of body functions
D. Excretion only
✅ Answer: C
Q20. Hormones are called chemical messengers because they:
A. Provide nutrition to cells
B. Carry signals between cells/organs
C. Produce nerve impulses
D. Digest food particles
✅ Answer: B
Previous-Year NEET Pattern Questions
Q21. Which one of the following is the characteristic feature of hormones?
A. Produced in large quantities
B. Act only at the site of production
C. Specific action on target cells
D. Stored permanently in blood
✅ Answer: C
Q22. The endocrine system differs from the nervous system in that it:
A. Uses receptors
B. Maintains body coordination
C. Produces slower but longer-lasting responses
D. Controls muscles only
✅ Answer: C
Challenge MCQ
Q23. A hormone fails to produce its effect even when present in normal concentration. The most likely reason is:
A. Lack of blood supply
B. Absence of receptors on target cells
C. Excess nutrient supply
D. Increased neural activity
✅ Answer: B
📝 Explanation: Hormones act only when target cells possess specific receptors.
NCERT-Based Direct Question
Q24. Hormones are best described as:
A. Digestive enzymes
B. Nutrient proteins
C. Non-nutrient intercellular messengers
D. Neural impulses
✅ Answer: C
High-Level Concept MCQ
Q25. Which statement best explains the necessity of endocrine coordination?
A. Nerves can regulate all body cells continuously
B. Neural control is always permanent
C. Nerves cannot innervate all body cells and long-term regulation is needed
D. Hormones act faster than nerve impulses
✅ Answer: C
NEET Previous Year Questions (PYQs)
Chapter: Chemical Coordination and Integration
Class 11 Biology
PYQ 1
Hormones are called:
A. Biocatalysts
B. Intercellular messengers
C. Intracellular messengers
D. Neurotransmitters
✅ Answer: B. Intercellular messengers
📘 NCERT Line: “Hormones are non-nutrient chemicals acting as intercellular messengers.”
PYQ 2
Which of the following glands is ductless?
A. Salivary gland
B. Sweat gland
C. Endocrine gland
D. Sebaceous gland
✅ Answer: C. Endocrine gland
PYQ 3
Hormones are produced in:
A. Excess quantity
B. Trace amounts
C. Equal amounts
D. Variable amounts only
✅ Answer: B. Trace amounts
PYQ 4
Which of the following acts as chemical messenger?
A. Enzyme
B. Hormone
C. Vitamin
D. Pigment
✅ Answer: B. Hormone
PYQ 5
The nervous system and endocrine system together control:
A. Digestion only
B. Respiration only
C. Body coordination and homeostasis
D. Excretion only
✅ Answer: C. Body coordination and homeostasis
PYQ 6
Hormones are transported through:
A. Lymph only
B. Nerve fibres
C. Blood
D. Muscles
✅ Answer: C. Blood
PYQ 7
Which statement is correct about endocrine glands?
A. They possess ducts
B. They release secretions into ducts
C. They release hormones directly into blood
D. They contain digestive enzymes only
✅ Answer: C. They release hormones directly into blood
PYQ 8
Neural coordination is characterized by:
A. Slow and prolonged action
B. Fast and short-lived action
C. Permanent action
D. Hormonal action
✅ Answer: B. Fast and short-lived action
PYQ 9
The target organ responds to a hormone because it possesses:
A. Enzymes
B. Nutrients
C. Specific receptors
D. Blood vessels
✅ Answer: C. Specific receptors
PYQ 10
Which one is NOT a feature of hormones?
A. Produced in trace amounts
B. Non-nutrient chemicals
C. Act as intercellular messengers
D. Stored permanently in bones
✅ Answer: D. Stored permanently in bones
Assertion & Reason PYQs
PYQ 11
Assertion:
Hormones are effective in very small quantities.
Reason:
Hormones act through specific receptors on target cells.
A. Both true and Reason explains Assertion
B. Both true but Reason does not explain Assertion
C. Assertion true but Reason false
D. Assertion false but Reason true
✅ Answer: A
PYQ 12
Assertion:
Endocrine glands are richly vascularized.
Reason:
Hormones are directly released into blood circulation.
A. Both true and Reason explains Assertion
B. Both true but Reason does not explain Assertion
C. Assertion true but Reason false
D. Assertion false but Reason true
✅ Answer: A
NCERT Exemplar-Type PYQs
PYQ 13
Select the correct statements:
- Hormones are non-nutrient chemicals.
- Hormones are secreted by endocrine glands.
- Hormones are transported through blood.
- Hormones act on target cells.
A. 1 and 2 only
B. 2 and 3 only
C. 1, 2, 3 and 4
D. 1 and 4 only
✅ Answer: C
PYQ 14
Which of the following correctly differentiates endocrine and nervous systems?
| Endocrine System | Nervous System |
|---|---|
| A. Fast | Slow |
| B. Long-lasting | Short-lived |
| C. Uses impulses | Uses hormones |
| D. Point-to-point | Widespread |
✅ Answer: B. Long-lasting | Short-lived
Diagram/Concept-Based PYQ
PYQ 15
Why is endocrine coordination necessary in addition to neural coordination?
A. Nerves are absent in humans
B. Neural control is always permanent
C. Nerves cannot innervate all body cells and long-term regulation is required
D. Hormones act faster than nerves
✅ Answer: C
High-Level NEET PYQ
PYQ 16
A hormone does not produce any effect on a target tissue despite normal secretion. The likely reason is:
A. Absence of blood supply
B. Deficiency of receptors on target cells
C. Excessive nerve supply
D. Increased hormone degradation in gland
✅ Answer: B
Most Repeated PYQ Facts for NEET
⭐ Hormones = Non-nutrient chemical messengers
⭐ Produced in trace amounts
⭐ Endocrine glands = Ductless glands
⭐ Hormones travel through blood
⭐ Neural action = Fast and short-lived
⭐ Hormonal action = Slow and long-lasting
NCERT Important Line for Direct Questions
⭐ “Hormones are non-nutrient chemicals which act as intercellular messengers and are produced in trace amounts.”
NEET Full Mock Test
Chapter: Chemical Coordination and Integration
Class 11 Biology
Total Questions: 45
Time: 45 Minutes
Marks: 180
(+4 for correct answer, -1 for incorrect answer)
SECTION A — MCQs
Q1. Hormones are:
A. Nutrient chemicals
B. Intercellular messengers
C. Digestive enzymes
D. Antibodies
Q2. Endocrine glands are called ductless glands because:
A. They lack blood supply
B. They lack hormones
C. They lack ducts
D. They lack target organs
Q3. Hormones are transported through:
A. Muscles
B. Blood
C. Bones
D. Neurons
Q4. Hormones are produced in:
A. Large quantities
B. Moderate quantities
C. Trace amounts
D. Unlimited quantities
Q5. Neural coordination is:
A. Slow and prolonged
B. Fast and short-lived
C. Permanent
D. Hormonal
Q6. Which system mainly controls chemical coordination?
A. Digestive system
B. Endocrine system
C. Skeletal system
D. Respiratory system
Q7. Target organs possess:
A. Enzymes
B. Pigments
C. Receptors
D. Hormones
Q8. Which statement is incorrect regarding hormones?
A. They act as chemical messengers
B. They are produced in trace amounts
C. They are always proteins
D. They act on target organs
Q9. Which of the following is NOT an endocrine gland?
A. Pituitary gland
B. Thyroid gland
C. Sweat gland
D. Adrenal gland
Q10. Hormones regulate:
A. Growth
B. Metabolism
C. Reproduction
D. All of these
Q11. Endocrine coordination is slower because hormones:
A. Move through ducts
B. Travel through blood
C. Are proteins only
D. Cannot bind receptors
Q12. The nervous system differs from endocrine system because it:
A. Uses hormones
B. Produces slow responses
C. Uses electrical impulses
D. Lacks coordination
Q13. Which is correctly matched?
A. Hormones — Nutrients
B. Blood — Transport medium
C. Endocrine gland — Duct gland
D. Target organ — Hormone producer
Q14. Hormones act only on:
A. All body cells
B. Cells with receptors
C. Blood cells only
D. Bone cells only
Q15. Invertebrates possess:
A. No hormones
B. Simple endocrine systems
C. Complex endocrine systems only
D. No coordination
Q16. Hormones are effective in small amounts because:
A. They are nutrients
B. They act through specific receptors
C. They remain stored permanently
D. They act on all cells
Q17. Neural coordination is called point-to-point because:
A. Hormones act everywhere
B. Nerves connect specific cells/organs
C. Blood reaches all organs
D. Signals are permanent
Q18. Which is NOT a property of endocrine coordination?
A. Slow action
B. Long-lasting effect
C. Highly localized rapid effect
D. Hormonal regulation
Q19. Hormones are:
A. Intracellular messengers
B. Intercellular messengers
C. Pigments
D. Vitamins
Q20. Chemical coordination is maintained by:
A. Bones
B. Muscles
C. Hormones
D. RBCs
ASSERTION–REASON QUESTIONS
Q21.
Assertion:
Hormones are produced in trace amounts.
Reason:
Hormones are highly specific in action.
A. Both true, Reason correct explanation
B. Both true, Reason not correct explanation
C. Assertion true, Reason false
D. Assertion false, Reason true
Q22.
Assertion:
Endocrine glands are richly vascularized.
Reason:
Hormones are directly released into blood.
A. Both true, Reason correct explanation
B. Both true, Reason not correct explanation
C. Assertion true, Reason false
D. Assertion false, Reason true
Q23.
Assertion:
Neural coordination is long-lasting.
Reason:
Nerve impulses travel rapidly.
A. Both true
B. Both false
C. Assertion false, Reason true
D. Assertion true, Reason false
Q24.
Assertion:
Hormones act on target organs.
Reason:
Target organs possess receptors for hormones.
A. Both true, Reason correct explanation
B. Both true, Reason not correct explanation
C. Assertion true, Reason false
D. Assertion false, Reason true
Q25.
Assertion:
Hormones are non-nutrient chemicals.
Reason:
Hormones provide energy to cells.
A. Both true
B. Both false
C. Assertion true, Reason false
D. Assertion false, Reason true
STATEMENT-BASED QUESTIONS
Q26. Select the correct statements:
- Hormones are chemical messengers.
- Hormones are produced in trace amounts.
- Hormones act through receptors.
- Hormones are always proteins.
A. 1 and 2 only
B. 1, 2 and 3 only
C. 2 and 4 only
D. All of these
Q27. Which statements are correct?
- Endocrine glands lack ducts.
- Hormones are transported by blood.
- Neural coordination is slow.
- Hormonal action is long-lasting.
A. 1 and 2 only
B. 1, 2 and 4 only
C. 2, 3 and 4 only
D. All of these
Q28. Identify the incorrect statement:
A. Hormones regulate body functions
B. Hormones act on target organs
C. Hormones are stored permanently in bones
D. Hormones act in minute quantities
Q29. Which statements are true regarding target organs?
- They contain receptors.
- They respond to hormones.
- They produce hormones only.
- They are specific for certain hormones.
A. 1 and 2 only
B. 1, 2 and 4 only
C. 2 and 3 only
D. All of these
Q30. Hormonal coordination helps in:
A. Growth
B. Reproduction
C. Metabolism
D. All of these
MATCH THE FOLLOWING
Q31.
| Column I | Column II |
|---|---|
| a. Hormones | i. Ductless gland |
| b. Thyroid | ii. Chemical messenger |
| c. Blood | iii. Transport medium |
| d. Endocrine gland | iv. Hormone-producing gland |
A. a-ii, b-iv, c-iii, d-i
B. a-i, b-ii, c-iii, d-iv
C. a-iii, b-iv, c-i, d-ii
D. a-ii, b-iii, c-i, d-iv
Q32.
| Column I | Column II |
|---|---|
| a. Nervous system | i. Long-lasting action |
| b. Endocrine system | ii. Rapid response |
| c. Hormones | iii. Blood transport |
| d. Nerve impulses | iv. Electrical signals |
A. a-ii, b-i, c-iii, d-iv
B. a-i, b-ii, c-iv, d-iii
C. a-iv, b-i, c-ii, d-iii
D. a-ii, b-iii, c-i, d-iv
CASE STUDY QUESTIONS
Q33–35
A student accidentally touched a hot pan and instantly removed his hand. Later, stress caused increased heartbeat for several minutes.
Q33. Which system caused immediate withdrawal?
A. Endocrine system
B. Nervous system
C. Circulatory system
D. Excretory system
Q34. Increased heartbeat for long duration was due to:
A. Hormonal action
B. Bone activity
C. Digestive action
D. Muscle storage
Q35. Which statement is correct?
A. Nervous action is slow
B. Hormonal action is short-lived
C. Neural action is rapid
D. Hormones act through nerves only
Q36–38
A doctor explained that endocrine glands release hormones directly into blood and hormones act only on target organs containing receptors.
Q36. Endocrine glands are:
A. Duct glands
B. Ductless glands
C. Exocrine glands only
D. Enzyme glands
Q37. Hormones act on:
A. All body cells equally
B. Cells lacking receptors
C. Specific target organs
D. Bone marrow only
Q38. Hormones travel through:
A. Neurons
B. Blood
C. Bones
D. Lymph nodes only
HIGH-LEVEL CONCEPT QUESTIONS
Q39. A hormone fails to produce its effect despite normal secretion. The likely reason is:
A. Lack of receptors on target cells
B. Increased blood flow
C. Excess nutrients
D. Excess nerve supply
Q40. Why is endocrine coordination necessary in the body?
A. Nerves reach all body cells
B. Hormonal action is faster
C. Long-term regulation is required
D. Hormones produce impulses
Q41. Which characteristic is common to nervous and endocrine systems?
A. Both use hormones
B. Both maintain body coordination
C. Both act slowly
D. Both use ducts
Q42. Hormones are called chemical messengers because they:
A. Provide nutrition
B. Carry signals between organs
C. Produce enzymes
D. Destroy receptors
Q43. The endocrine system mainly helps in maintaining:
A. Homeostasis
B. Digestion only
C. Excretion only
D. Movement only
Q44. Which statement best explains target specificity of hormones?
A. Hormones enter all cells
B. Target cells possess specific receptors
C. Hormones are stored in target cells
D. Hormones act randomly
Q45. Which one is the most appropriate definition of hormones?
A. Nutrient chemicals produced in large amounts
B. Digestive chemicals secreted into ducts
C. Non-nutrient intercellular messengers produced in trace amounts
D. Electrical impulses transmitted by neurons
Internal Links
Neural Control and Coordination Notes
Human Reproduction NEET Notes
Body Fluids and Circulation Notes
Digestion and Absorption Notes
Locomotion and Movement Notes
Biomolecules NEET Revision Notes
Cell Cycle and Cell Division Notes
Breathing and Exchange of Gases Notes
Excretory Products and Elimination Notes
NEET Biology Full Mock Tests
ANSWER SHEET
| Q.No | Ans | Q.No | Ans | Q.No | Ans |
|---|---|---|---|---|---|
| 1 | B | 16 | B | 31 | A |
| 2 | C | 17 | B | 32 | A |
| 3 | B | 18 | C | 33 | B |
| 4 | C | 19 | B | 34 | A |
| 5 | B | 20 | C | 35 | C |
| 6 | B | 21 | A | 36 | B |
| 7 | C | 22 | A | 37 | C |
| 8 | C | 23 | C | 38 | B |
| 9 | C | 24 | A | 39 | A |
| 10 | D | 25 | C | 40 | C |
| 11 | B | 26 | B | 41 | B |
| 12 | C | 27 | B | 42 | B |
| 13 | B | 28 | C | 43 | A |
| 14 | B | 29 | B | 44 | B |
| 15 | B | 30 | D | 45 | C |
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