Biology
Chapter 10
Board Weightage: 8 Marks in Class 9 Exams
Nutrition & Balanced Diet
Prescribed Textbook: Selina Concise Biology (Class 9) - Chapter 10
Canonical Link:
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📖 Syllabus Scope & Overview
Nutrients: Carbohydrates, proteins, fats, vitamins (A, B, C, D, E, K), mineral salts (Fe, Ca, I, P), water and roughage, balanced diet requirements, and deficiency diseases (Kwashiorkor, Marasmus, Scurvy, Rickets, Goitre).
🔑 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: Protein Energy Malnutrition (PEM)
1 Mark (Structural Location / Physiological Function)
"Kwashiorkor protein deficiency oedema"
📘 Technical Definition & Detailed Description:
In ICSE Class 9 Biology (Nutrition & Balanced Diet), "Kwashiorkor protein deficiency oedema" 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: "Kwashiorkor protein deficiency oedema".
📝 Model Answer Application (Exact Phrasing for Board Exam):
"The physiological role of Protein Energy Malnutrition (PEM) is characterized by "Kwashiorkor protein deficiency oedema", ensuring proper structural and functional regulation."
Mandatory Keyword #2
Core Definition
Chapter Concept: Protein Energy Malnutrition (PEM)
1 Mark (Structural Location / Physiological Function)
"Marasmus protein and calorie deficiency"
📘 Technical Definition & Detailed Description:
In ICSE Class 9 Biology (Nutrition & Balanced Diet), "Marasmus protein and calorie deficiency" 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: "Marasmus protein and calorie deficiency".
📝 Model Answer Application (Exact Phrasing for Board Exam):
"The physiological role of Protein Energy Malnutrition (PEM) is characterized by "Marasmus protein and calorie deficiency", ensuring proper structural and functional regulation."
Mandatory Keyword #3
Core Definition
Chapter Concept: Protein Energy Malnutrition (PEM)
1 Mark (Structural Location / Physiological Function)
"Scurvy Vitamin C"
📘 Technical Definition & Detailed Description:
In ICSE Class 9 Biology (Nutrition & Balanced Diet), "Scurvy Vitamin C" 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: "Scurvy Vitamin C".
📝 Model Answer Application (Exact Phrasing for Board Exam):
"The physiological role of Protein Energy Malnutrition (PEM) is characterized by "Scurvy Vitamin C", ensuring proper structural and functional regulation."
Mandatory Keyword #4
Core Definition
Chapter Concept: Protein Energy Malnutrition (PEM)
1 Mark (Structural Location / Physiological Function)
"Rickets Vitamin D and calcium"
📘 Technical Definition & Detailed Description:
In ICSE Class 9 Biology (Nutrition & Balanced Diet), "Rickets Vitamin D and calcium" 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: "Rickets Vitamin D and calcium".
📝 Model Answer Application (Exact Phrasing for Board Exam):
"The physiological role of Protein Energy Malnutrition (PEM) is characterized by "Rickets Vitamin D and calcium", 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 10 - Review Questions Q.5
Selina Concise Biology (Class 9) - Chapter 10 - End-of-Chapter Review
3 Marks Total
With reference to Nutrition & Balanced Diet: (i) Define the biological process of Protein Energy Malnutrition (PEM). (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 Protein Energy Malnutrition (PEM) incorporating mandatory ICSE terminology: Kwashiorkor protein deficiency oedema, Marasmus protein and calorie deficiency, Scurvy Vitamin C.
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 9 Exam Blueprint - Chapter 10
2 Marks Total
Define "Protein Energy Malnutrition (PEM)" in the context of ICSE Class 9 Biology. State its primary characteristic or SI unit/standard symbol.
Step-by-Step Marking Breakdown
Step 1: Precise Technical Definition: Kwashiorkor is caused by deficiency of protein in diet (swollen belly, oedema, dark peeling skin). Marasmus is caused by deficiency of both protein and total calories (wasting of m...
1 Mark
Step 2: Mandatory Technical Criteria: Ensure the definition contains mandatory keywords: Kwashiorkor protein deficiency oedema, Marasmus protein and calorie deficiency, Scurvy Vitamin C.
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 "Protein Energy Malnutrition (PEM)". 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 Protein Energy Malnutrition (PEM).
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 Protein Energy Malnutrition (PEM)
(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 "Protein Energy Malnutrition (PEM)" and "Protein Energy Malnutrition (PEM)" 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: Protein Energy Malnutrition (PEM) focuses on Kwashiorkor protein deficiency oedema, whereas Protein Energy Malnutrition (PEM) emphasizes Kwashiorkor protein deficiency oedema.
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 9
4 Marks Total
A comprehensive ICSE examination question based on "Nutrition & Balanced Diet":
(i) State the fundamental law or rule governing "Protein Energy Malnutrition (PEM)". [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 Kwashiorkor protein deficiency oedema with related quantities. The correct understanding requires strict application of Protein Energy Malnutrition (PEM).
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 9
4 Marks Total
A critical scenario-based problem in "Nutrition & Balanced Diet": An experiment is performed under non-ideal conditions involving "Protein Energy Malnutrition (PEM)" and "Protein Energy Malnutrition (PEM)".
(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: Kwashiorkor protein deficiency oedema, Marasmus protein and calorie deficiency, Scurvy Vitamin C, Rickets Vitamin D and calcium.
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.