Biology
Chapter 9
Board Weightage: 10 - 12 Marks in ICSE Board Exam
The Endocrine System: Hormones & Disorders
Prescribed Textbook: Selina Concise Biology (Class 10) - Chapter 12
Canonical Link:
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📖 Syllabus Scope & Overview
Ductless glands (Endocrine) vs exocrine glands, definition of hormones, Glands: 1. Pituitary (Master gland - GH, TSH, ACTH, FSH, LH, Vasopressin/ADH, Oxytocin; disorders: Gigantism, Dwarfism, Acromegaly, Diabetes Insipidus), 2. Thyroid (Thyroxine; disorders: Simple Goitre, Cretinism, Myxoedema, Exophthalmic Goitre), 3. Pancreas (Islets of Langerhans: Beta cells secrete Insulin - lowers blood glucose; Alpha cells secrete Glucagon - raises blood glucose; disorder: Diabetes Mellitus), 4. Adrenal (Adrenal cortex: Cortisone; Adrenal medulla: Adrenaline - fight, flight or fright emergency hormone).
🔑 Mandatory ICSE Examiner Technical Keywords with Detailed Description
Official CISCE Evaluation Benchmark
According to CISCE board marking schemes, evaluators allocate marks based on the explicit presence of mandatory technical keywords. General or colloquial explanations fail to secure full marks. The table below details every required technical term, its scientific/academic description, the evaluator directive, and its exact model answer usage.
Mandatory Keyword #1
Core Definition
Chapter Concept: Insulin vs ADH & Associated Diabetes Types
1 Mark (Structural Location / Physiological Function)
"Insulin from Beta cells of Islets of Langerhans"
📘 Technical Definition & Detailed Description:
In ICSE Class 10 Biology (The Endocrine System: Hormones & Disorders), "Insulin from Beta cells of Islets of Langerhans" is an indispensable physiological term, anatomical structure, or biological process defined in the prescribed ICSE syllabus.
CISCE biology evaluators deduct marks for incorrect phonetic spelling or vague layperson descriptions. Candidates must use exact biological terminology: "Insulin from Beta cells of Islets of Langerhans".
📝 Model Answer Application (Exact Phrasing for Board Exam):
"The physiological role of Insulin vs ADH & Associated Diabetes Types is characterized by "Insulin from Beta cells of Islets of Langerhans", ensuring proper structural and functional regulation."
Mandatory Keyword #2
Core Definition
Chapter Concept: Insulin vs ADH & Associated Diabetes Types
1 Mark (Structural Location / Physiological Function)
"Diabetes Mellitus (lack of insulin, sugar in urine)"
📘 Technical Definition & Detailed Description:
In ICSE Class 10 Biology (The Endocrine System: Hormones & Disorders), "Diabetes Mellitus (lack of insulin, sugar in urine)" is an indispensable physiological term, anatomical structure, or biological process defined in the prescribed ICSE syllabus.
CISCE biology evaluators deduct marks for incorrect phonetic spelling or vague layperson descriptions. Candidates must use exact biological terminology: "Diabetes Mellitus (lack of insulin, sugar in urine)".
📝 Model Answer Application (Exact Phrasing for Board Exam):
"The physiological role of Insulin vs ADH & Associated Diabetes Types is characterized by "Diabetes Mellitus (lack of insulin, sugar in urine)", ensuring proper structural and functional regulation."
Mandatory Keyword #3
Core Definition
Chapter Concept: Insulin vs ADH & Associated Diabetes Types
1 Mark (Structural Location / Physiological Function)
"Diabetes Insipidus (lack of ADH, dilute urine without sugar)"
📘 Technical Definition & Detailed Description:
In ICSE Class 10 Biology (The Endocrine System: Hormones & Disorders), "Diabetes Insipidus (lack of ADH, dilute urine without sugar)" is an indispensable physiological term, anatomical structure, or biological process defined in the prescribed ICSE syllabus.
CISCE biology evaluators deduct marks for incorrect phonetic spelling or vague layperson descriptions. Candidates must use exact biological terminology: "Diabetes Insipidus (lack of ADH, dilute urine without sugar)".
📝 Model Answer Application (Exact Phrasing for Board Exam):
"The physiological role of Insulin vs ADH & Associated Diabetes Types is characterized by "Diabetes Insipidus (lack of ADH, dilute urine without sugar)", ensuring proper structural and functional regulation."
Mandatory Keyword #4
Core Definition
Chapter Concept: Insulin vs ADH & Associated Diabetes Types
1 Mark (Structural Location / Physiological Function)
"Adrenaline is emergency hormone (fight or flight)"
📘 Technical Definition & Detailed Description:
In ICSE Class 10 Biology (The Endocrine System: Hormones & Disorders), "Adrenaline is emergency hormone (fight or flight)" is an indispensable physiological term, anatomical structure, or biological process defined in the prescribed ICSE syllabus.
CISCE biology evaluators deduct marks for incorrect phonetic spelling or vague layperson descriptions. Candidates must use exact biological terminology: "Adrenaline is emergency hormone (fight or flight)".
📝 Model Answer Application (Exact Phrasing for Board Exam):
"The physiological role of Insulin vs ADH & Associated Diabetes Types is characterized by "Adrenaline is emergency hormone (fight or flight)", ensuring proper structural and functional regulation."
Mandatory Keyword #5
Core Definition
Chapter Concept: Insulin vs ADH & Associated Diabetes Types
1 Mark (Structural Location / Physiological Function)
"Thyroxine contains iodine; lack causes Goitre"
📘 Technical Definition & Detailed Description:
In ICSE Class 10 Biology (The Endocrine System: Hormones & Disorders), "Thyroxine contains iodine; lack causes Goitre" is an indispensable physiological term, anatomical structure, or biological process defined in the prescribed ICSE syllabus.
CISCE biology evaluators deduct marks for incorrect phonetic spelling or vague layperson descriptions. Candidates must use exact biological terminology: "Thyroxine contains iodine; lack causes Goitre".
📝 Model Answer Application (Exact Phrasing for Board Exam):
"The physiological role of Insulin vs ADH & Associated Diabetes Types is characterized by "Thyroxine contains iodine; lack causes Goitre", ensuring proper structural and functional regulation."
Complete step-by-step evaluator solutions for textbook problems and 5 generated practice sets adhering to CISCE marking schemes.
📘 Textbook Problem: Textbook Exercise 9 - Review Questions Q.5
Selina Concise Biology (Class 10) - Chapter 12 - End-of-Chapter Review
3 Marks Total
With reference to The Endocrine System: Hormones & Disorders: (i) Define the biological process of Insulin vs ADH & Associated Diabetes Types. (ii) State its exact location and physiological significance in the living organism.
Step-by-Step Marking Breakdown
Step 1: Scientific Definition with Technical Keywords: Define Insulin vs ADH & Associated Diabetes Types incorporating mandatory ICSE terminology: Insulin from Beta cells of Islets of Langerhans, Diabetes Mellitus (lack of insulin, sugar in urine), Diabetes Insipidus (lack of ADH, dilute urine without sugar).
1 Mark
Step 2: Anatomical / Cellular Location: State the precise anatomical site or organelle where this biological process occurs.
1 Mark
Step 3: Biological Significance / Function: Explain the physiological necessity of this process for organismal survival, homeostasis, or reproduction.
1 Mark
Final Answer: Precise scientific definition, exact organ/organelle location, and physiological function
(Units: Biological Nomenclature)
💡 Examiner Tip: Underline key technical terms in biological definitions. CISCE examiners specifically look for mandatory keywords.
🎯 Generated Set: Generated Practice Set 1 - Core Concept (2 Marks)
ICSE Class 10 Exam Blueprint - Chapter 9
2 Marks Total
Define "Insulin vs ADH & Associated Diabetes Types" in the context of ICSE Class 10 Biology. State its primary characteristic or SI unit/standard symbol.
Step-by-Step Marking Breakdown
Step 1: Precise Technical Definition: 1. Insulin (Pancreas β-cells): Promotes glycogenesis (glucose → glycogen). Hyposecretion causes DIABETES MELLITUS (high blood sugar, glucose in urine). 2. Vasopressin / ADH (Poster...
1 Mark
Step 2: Mandatory Technical Criteria: Ensure the definition contains mandatory keywords: Insulin from Beta cells of Islets of Langerhans, Diabetes Mellitus (lack of insulin, sugar in urine), Diabetes Insipidus (lack of ADH, dilute urine without sugar).
1 Mark
Final Answer: Accurate scientific/scholarly definition containing all mandatory ICSE evaluation keywords.
(Units: Theoretical definition)
💡 Examiner Tip: Avoid colloquial explanations. Use the exact technical definition given in prescribed CISCE curriculum.
🎯 Generated Set: Generated Practice Set 2 - Method & Application (3 Marks)
ICSE Question Bank & Specimen Framework - Biology
3 Marks Total
Explain the procedural method or practical demonstration used to verify "Insulin vs ADH & Associated Diabetes Types". State the working apparatus/setup and key precautions.
Step-by-Step Marking Breakdown
Step 1: State the Formula / Conceptual Principle: State the fundamental principle governing Insulin vs ADH & Associated Diabetes Types.
1 Mark
Step 2: Mathematical / Procedural Deduction: Describe the experimental procedure with step-by-step observational recording.
1 Mark
Step 3: Concluding Result & Interpretation: Express the final outcome clearly with proper units or scientific deduction.
1 Mark
Final Answer: Verified procedural conclusion for Insulin vs ADH & Associated Diabetes Types
(Units: Procedural steps)
💡 Examiner Tip: In derivation and numerical questions, every intermediate mathematical step carries fractional credit.
🎯 Generated Set: Generated Practice Set 3 - Comparative Analysis (3 Marks)
ICSE Exemplar Practice Paper - Biology
3 Marks Total
Differentiate between "Insulin vs ADH & Associated Diabetes Types" and "Insulin vs ADH & Associated Diabetes Types" on the basis of: (i) Fundamental definition/mechanism, (ii) Key working condition or formula, (iii) Real-world practical example or application.
Step-by-Step Marking Breakdown
Point 1: Conceptual Difference: Contrast the primary mechanisms: Insulin vs ADH & Associated Diabetes Types focuses on Insulin from Beta cells of Islets of Langerhans, whereas Insulin vs ADH & Associated Diabetes Types emphasizes Insulin from Beta cells of Islets of Langerhans.
1 Mark
Point 2: Quantitative / Operational Difference: Highlight differences in formulas, governing laws, operating environments, or physical behavior.
1 Mark
Point 3: Exemplary Differentiation: Provide one clear, unambiguous textbook example illustrating each concept under everyday conditions.
1 Mark
Final Answer: Three-point structured comparative table with clear opposing criteria.
(Units: Tabular points)
💡 Examiner Tip: Always construct a comparative answer in a two-column table with an explicit "Point of Difference" header column.
🎯 Generated Set: Generated Practice Set 4 - Board Standard Structured (4 Marks)
ICSE Board Marking Blueprint - Class 10
4 Marks Total
A comprehensive ICSE examination question based on "The Endocrine System: Hormones & Disorders":
(i) State the fundamental law or rule governing "Insulin vs ADH & Associated Diabetes Types". [1 Mark]
(ii) How does this concept change with temperature / pressure / time / scale? [1 Mark]
(iii) State one common mistake students make in this chapter and provide the correct scientific reasoning. [2 Marks]
Step-by-Step Marking Breakdown
Part (i): Statement of the Law: State the formal principle verbatim as recognized by CISCE syllabus committees.
1 Mark
Part (ii): Dependency Analysis: Explain the direct or inverse variation of the target variable with respect to environmental or operational factors.
1 Mark
Part (iii): Error Analysis & Correct Resolution: Identify the frequent pitfall: Students often confuse Insulin from Beta cells of Islets of Langerhans with related quantities. The correct understanding requires strict application of Insulin vs ADH & Associated Diabetes Types.
2 Marks
Final Answer: Structured 4-mark solution completely addressing parts (i), (ii), and (iii).
(Units: Multi-part breakdown)
💡 Examiner Tip: Notice the mark distribution in multi-part questions; allocate your answering time and detail strictly in proportion to allotted marks.
🎯 Generated Set: Generated Practice Set 5 - Higher Order Thinking (HOTS) (4 Marks)
ICSE High-Achiever Challenge Series - Class 10
4 Marks Total
A critical scenario-based problem in "The Endocrine System: Hormones & Disorders": An experiment is performed under non-ideal conditions involving "Insulin vs ADH & Associated Diabetes Types" and "Insulin vs ADH & Associated Diabetes Types".
(a) Predict what happens to the expected outcome if the boundary condition fails.
(b) Give complete scientific justification.
(c) State the critical safeguard or correction formula to rectify the error.
Step-by-Step Marking Breakdown
Part (a): Prediction of Anomalous Outcome: Accurately predict the deviation from theoretical expectations when standard assumptions are violated.
1 Mark
Part (b): Scientific Justification: Provide a rigorous scientific explanation using first principles and mandatory keywords: Insulin from Beta cells of Islets of Langerhans, Diabetes Mellitus (lack of insulin, sugar in urine), Diabetes Insipidus (lack of ADH, dilute urine without sugar), Adrenaline is emergency hormone (fight or flight).
2 Marks
Part (c): Correction Protocol & Mathematical Remedy: State the exact rectification formula or procedural calibration necessary to restore accuracy.
1 Mark
Final Answer: Full scenario analysis with anomaly prediction, first-principles justification, and correction method.
(Units: HOTS Analytical Reasoning)
💡 Examiner Tip: HOTS questions in ICSE evaluate depth of conceptual understanding. Avoid superficial guessing; reason backward from core laws.